Added code for follower

code/cppfol/header/ConcurrentQueue.hpp

@@ -3,12 +3,59 @@
 #include <queue>
 #include <mutex>
 #include <condition_variable>
+#include <set>
+#include <string>
+#include <rdma/rdma_cma.h>
+#include <rdma/rdma_verbs.h>
+#include "Logger.hpp"
+
+class Comparator
+{
+public:
+    inline bool operator()(const struct ibv_wc *c1, const struct ibv_wc *c2)
+        const
+    {
+        struct MessageHeader *req1 = (struct MessageHeader *)c1->wr_id;
+        struct MessageHeader *req2 = (struct MessageHeader *)c2->wr_id;
+        if (req1->keySize != req2->keySize)
+            return true;
+        char *key1 = (char *)req1 + MessageHeaderSize;
+        char *key2 = (char *)req2 + MessageHeaderSize;
+        for (uint32_t i = 0; i < req1->keySize; i++)
+        {
+            if (key1[i] != key2[i])
+                return true;
+        }
+        return false;
+    }
+};
+
+class ConcurrentQueue
+{
+private:
+    std::queue<struct ibv_wc *> queue1;
+    std::queue<struct ibv_wc *> queue2;
+    std::mutex queueMutex;
+    std::set<struct ibv_wc *, Comparator> runningRequests;
+    std::condition_variable queueCv;
+
+public:
+    void push(struct ibv_wc *const &data);
+    bool empty();
+    struct ibv_wc *try_pop();
+    void removeFromSet(struct ibv_wc *data);
+    void wait_and_pop(struct ibv_wc *&popped_value);
+};
+#endif
+
+/*
 
 template <typename Data>
 class ConcurrentQueue
 {
 private:
-    std::queue<Data> queue;
+    std::queue1<Data> queue;
+    std::queue2<Data> queue;
     std::mutex queueMutex;
     std::condition_variable queueCv;
 
@@ -16,7 +63,7 @@ public:
     void push(Data const &data)
     {
         std::unique_lock<std::mutex> lock(queueMutex);
-        queue.push(data);
+        queue1.push(data);
         lock.unlock();
         queueCv.notify_one();
     }
@@ -30,7 +77,7 @@ public:
     bool try_pop(Data &popped_value)
     {
         std::unique_lock<std::mutex> lock(queueMutex);
-        if (queue.empty())
+        if (queue2.empty())
         {
             return false;
         }
@@ -48,4 +95,5 @@ public:
         queue.pop();
     }
 };
-#endif
\ No newline at end of file
+#endif
+*/
\ No newline at end of file

code/cppfol/header/Executor.hpp

 #ifndef __Executor__
 #define __Executor__
 #include <vector>
-#include <map>
 
 #include "CqEventData.hpp"
-#include "ConcurrentQueue.hpp"
+#include "RdmaEndpointGroup.hpp"
 #include "TaskThread.hpp"
-#include "RdmaSalEndpoint.hpp"
+#include "Logger.hpp"
 
 class Executor
 {
     int _size{0};
-    std::vector<TaskThread *> *_taskThreads{NULL};
-    ConcurrentQueue<struct ibv_wc *> *_taskQueue{NULL};
-    std::unordered_map<uint32_t, RdmaSalEndpoint *> *_qpSalEndpointMap{NULL};
+    std::vector<TaskThread *> _taskThreads{NULL};
+    ConcurrentQueue *_taskQueue{NULL};
 
 public:
-    Executor(int size,std::unordered_map<uint32_t, RdmaSalEndpoint *> *_qpSalEndpointMap);
+    Executor(int size);
+    void createThreads(std::unordered_map<uint32_t, RdmaRepEndpoint *> *clientRepMap,
+                        std::unordered_map<uint32_t, RdmaRepEndpoint *> *serverRepMap,
+                       std::unordered_map<uint32_t, RdmaSalEndpoint *> *salMap);
     void submit(struct ibv_wc *task);
     void getTask();
+    void stop();
 };
-//long affinities[]
+// long affinities[]
 #endif
\ No newline at end of file

code/cppfol/header/MessageFormats.hpp

 #ifndef __MessageFormats__
 #define __MessageFormats__
-enum RequestType
+enum MessageType
 {
-    GET,
-    PUT,
-    DELETE,
-    INVALIDATE
-};
-enum ResponseStatus
-{
-    SUCCESS,
-    FAILURE
+    GET = (1u << 0),
+    PUT = (1u << 1),
+    DELETE = (1u << 2),
+    INVALIDATE = (1u << 3),
+    SUCCESS = (1u << 4),
+    FAILURE = (1u <<5)
 };
 
-struct __attribute__ ((__packed__)) SalRequestHeader
+struct __attribute__ ((__packed__)) MessageHeader
 {
     uint32_t id;
-    enum RequestType type;
+    enum MessageType type;
     uint32_t keySize;
     uint32_t valueSize;
 };
 
+static const uint32_t MessageHeaderSize = sizeof(MessageHeader);
+/*
+
 struct __attribute__ ((__packed__)) SalResponseHeader
 {
     uint32_t  id;
-    enum ResponseStatus status;
-    /*
-    * Note value will be present only in case of response status is success
-    */
+    enum MessageType status;
+    //Note value will be present only in case of response status is success
     uint32_t valueSize;
 };
 
 struct __attribute__ ((__packed__)) InvRequestHeader
 {
     uint32_t  id;
-    enum RequestType type;
+    enum MessageType type;
     uint32_t keySize;    
 };
 
@@ -42,11 +40,12 @@ struct __attribute__ ((__packed__)) InvRequestHeader
 struct __attribute__ ((__packed__)) InvResponseHeader
 {
     uint32_t  id;
-    enum ResponseStatus status; 
+    enum MessageType status; MessageHeader
 };
-static uint32_t SalRequestHeaderSize = sizeof(SalRequestHeader);
+*/
+/*
 static uint32_t SalResponseHeaderSize = sizeof(SalResponseHeader);
 static uint32_t InvRequestHeaderSize = sizeof(InvRequestHeader);
 static uint32_t InvResponseHeaderSize = sizeof(InvResponseHeader);
-
+*/
 #endif
\ No newline at end of file

code/cppfol/header/Properties.hpp

+#ifndef __Properties__
+#define __Properties__
+
+#include <string>
+#include <iostream>
+#include <fstream>
+#include <map>
+
+class Properties
+{
+private:
+    std::map<std::string, std::string> _props;
+    const std::string _WHITESPACE = " \n\r\t\f\v";
+    std::string ltrim(const std::string &s);
+    std::string rtrim(const std::string &s);
+    std::string trim(const std::string &);
+
+public:
+    Properties(std::string filename);
+    std::string getValue(std::string key);
+};
+
+#endif
\ No newline at end of file

code/cppfol/header/RdmaClientEndpoint.hpp → code/cppfol/header/RdmaClientRepEndpoint.hpp

+#ifndef __RDMACLIENTREPENDPOINT__
+#define __RDMACLIENTREPENDPOINT__
+
 #include <rdma/rdma_cma.h>
 #include <rdma/rdma_verbs.h>
 #include <stdint.h>
@@ -5,16 +8,18 @@
 #include <iostream>
 #include <errno.h>
 #include <arpa/inet.h>
-
-#ifndef __RDMACLIENTENDPOINT__
-#define __RDMACLIENTENDPOINT__
-
+#include <mutex>
+#include <atomic>
+#include <shared_mutex>
+#include <queue>
+#include <rocksdb/db.h>
+
+#include "RdmaRepEndpoint.hpp"
+#include "Logger.hpp"
 #include "MessageFormats.hpp"
-#include <boost/lockfree/queue.hpp>
 
-class RdmaClientEndpoint
+class RdmaClientRepEndpoint : public RdmaRepEndpoint
 {
-
     static int CONN_STATE_INITIALIZED;
     static int CONN_STATE_ADDR_RESOLVED;
     static int CONN_STATE_ROUTE_RESOLVED;
@@ -22,42 +27,28 @@ class RdmaClientEndpoint
     static int CONN_STATE_CONNECTED;
     static int CONN_STATE_PARTIAL_CLOSED;
     static int CONN_STATE_CLOSED;
+    int _state{0};
+   
+    int _maxInLine{0};
+    int _timeoutMs{0};
+    int _retryCount{0};
+    int _maxRetryCount{2};
 
-    struct rdma_cm_id *_cm_id = NULL;
-    struct ibv_pd *_protectionDomain;
-
-    int _sendQueueSize;
-    int _recvQueueSize;
-    int _sendMsgSize;
-    int _recvMsgSize;
-    int _state;
-    int _timeoutMs;
-    int _maxInLine;
     const char *_connData;
-
-    void *_sendBuff = NULL;
-    void *_recvBuff = NULL;
-    struct ibv_mr *_sendMr = NULL;
-    struct ibv_mr *_recvMr = NULL;
-
-    boost::lockfree::queue<void *> *_sendBuffers;
-
-    void completeClose();
-    void connect();
+    
     void registerMemory();
 
 public:
+    
     std::atomic<uint64_t> _requestId{12};
 
-    RdmaClientEndpoint(struct rdma_cm_id *id,  int sendQueueSize, int recvQueueSize,
-                       int sendMsgSize, int recvMsgSize, int maxInLine, int timeout);
+    RdmaClientRepEndpoint(struct rdma_cm_id *id, int sendQueueSize, int recvQueueSize,
+                    int sendMsgSize, int recvMsgSize, int maxInLine, int timeout, rocksdb::DB *_db);
+    void connect();
     void connect(const char *ip, const char *port, const char *connData);
     bool isConnected();
     void processCmEvent(struct rdma_cm_event *event);
     void createResources(struct ibv_cq *cq);
     void close();
-    int sendMessage(const char *buffer, int size);
-    void processSendComp(struct ibv_wc);
-    void processRecvComp(struct ibv_wc);
 };
 #endif
\ No newline at end of file

code/cppfol/header/RdmaCmProcessor.hpp

+#ifndef __RDMACMPROCESSOR__
+#define __RDMACMPROCESSOR__
+
+#include <rdma/rdma_cma.h>
+#include <rdma/rdma_verbs.h>
+#include <stdint.h>
+#include <thread>
+#include <iostream>
+
+#include "Logger.hpp"
+#include "RdmaEndpointGroup.hpp"
+
+class RdmaCmProcessor
+{
+
+    struct rdma_event_channel *_eventChannel{NULL};
+    std::thread *_cmEventThread{NULL};
+    RdmaEndpointGroup *_endpointGroup{NULL};
+    bool _stop{false};
+
+public:
+    RdmaCmProcessor(RdmaEndpointGroup *group);
+    struct rdma_cm_id *createId();
+    void processCmEvent();
+    void start(bool newThread);
+    void close();
+};
+#endif
\ No newline at end of file

code/cppfol/header/RdmaCqProcessor.hpp

+#ifndef __RDMACQPROCESSOR__
+#define __RDMACQPROCESSOR__
+
 #include <rdma/rdma_cma.h>
 #include <rdma/rdma_verbs.h>
 #include <stdint.h>
@@ -5,30 +8,23 @@
 #include <thread>
 #include <unordered_map>
 
-#ifndef __RDMACQPROCESSOR__
-#define __RDMACQPROCESSOR__
-
-#include "RdmaClientEndpoint.hpp"
+#include "Executor.hpp"
+#include "Logger.hpp"
 
 class RdmaCqProcessor
 {
 public:
-	struct ibv_comp_channel *_compChannel;
-	struct ibv_cq *_completionQueue;
-	std::thread *_compQueueThread;
-	std::unordered_map<uint32_t, RdmaClientEndpoint *> *_qpEndpointMap{NULL};
+    struct ibv_comp_channel *_compChannel{NULL};
+    struct ibv_cq *_completionQueue{NULL};
+    std::thread *_compQueueThread{NULL};
+    bool _stop{false};
+    Executor *_executor{NULL};
 
-	RdmaCqProcessor(ibv_context *verbs, int compQueueSize);
-	struct ibv_cq *getCq();
-	void start();
-	void processCQEvents();
-	void dispatchCqEvents(ibv_wc *wc_array, int size);
-	void close();
-	void registerEp(uint64_t qpum, RdmaClientEndpoint* ep);
+    RdmaCqProcessor(Executor *ex, ibv_context *verbs, int compQueueSize);
+    struct ibv_cq *getCq();
+    void start();
+    void processCQEvents();
+    void close();
 };
 
 #endif
-
-// https://www.rdmamojo.com/2013/03/09/ibv_get_cq_event/
-// https://man7.org/linux/man-pages/man3/ibv_poll_cq.3.html
-// https://man7.org/linux/man-pages/man3/ibv_get_cq_event.3.html
\ No newline at end of file

code/cppfol/header/RdmaEndpoint.hpp

 #ifndef __RDMAENDPOINT__
 #define __RDMAENDPOINT__
 #include <iostream>
-#include <boost/lockfree/queue.hpp>
+#include <queue>
 #include <rdma/rdma_cma.h>
 #include <rdma/rdma_verbs.h>
 #include <stdint.h>
@@ -12,7 +12,9 @@
 #include <vector>
 #include <mutex>
 #include <shared_mutex>
+
 #include "CqEventData.hpp"
+#include "Logger.hpp"
 
 class RdmaEndpoint
 {
@@ -36,15 +38,17 @@ public:
     char *_recvBuff{NULL};
     struct ibv_mr *_sendMr{NULL};
     struct ibv_mr *_recvMr{NULL};
-    boost::lockfree::queue<void *> *_sendBuffers{NULL};
+    std::queue<char*> _sendBuffers;
+    std::mutex _sendBuffersM;
 
     RdmaEndpoint(struct rdma_cm_id *id, struct ibv_cq *completionQueue, int sendQueueSize,
                  int recvQueueSize, int sendMsgSize, int recvMsgSize);
 
     void createResources();
     void processCmEvent(struct rdma_cm_event *event);
-    void clientClose();
+    void close();
     virtual void processSendCompletion(struct ibv_wc *data) = 0;
     virtual void processRecvCompletion(struct ibv_wc *data) = 0;
+    virtual ~RdmaEndpoint();
 };
 #endif
\ No newline at end of file

code/cppfol/header/RdmaEndpointGroup.hpp

+#ifndef __RDMA_ENDPOINT_GROUP__
+#define __RDMA_ENDPOINT_GROUP__
+#include <rdma/rdma_cma.h>
+#include <rdma/rdma_verbs.h>
+#include <stdint.h>
+#include <thread>
+#include <netdb.h>
+#include <arpa/inet.h>
+#include <map>
+#include <vector>
+#include <mutex>
+#include <shared_mutex>
+#include "RdmaSalEndpoint.hpp"
+#include "RdmaRepEndpoint.hpp"
+#include "Logger.hpp"
+
+
+class RdmaEndpointGroup
+{
+public:
+    std::vector<RdmaSalEndpoint *> _salEps;
+    std::unordered_map<uint32_t, RdmaSalEndpoint *> _qpSalEndpointMap;
+
+    virtual void processCmEvent(struct rdma_cm_event *event) = 0;
+};
+#endif
\ No newline at end of file

code/cppfol/header/RdmaRepEndpoint.hpp

+#ifndef __RDMAREPENDPOINT__
+#define __RDMAREPENDPOINT__
+
+#include <rdma/rdma_cma.h>
+#include <rdma/rdma_verbs.h>
+#include <stdint.h>
+#include <netdb.h>
+#include <iostream>
+#include <errno.h>
+#include <arpa/inet.h>
+#include <mutex>
+#include <atomic>
+#include <shared_mutex>
+#include <queue>
+#include <rocksdb/db.h>
+
+#include "Logger.hpp"
+#include "MessageFormats.hpp"
+
+class RdmaRepEndpoint
+{
+    public:
+
+    struct rdma_cm_id *_cm_id{NULL};
+    struct ibv_pd *_protectionDomain;
+
+    int _sendQueueSize;
+    int _recvQueueSize;
+    int _sendMsgSize;
+    int _recvMsgSize;
+    char *_sendBuff = NULL;
+    char *_recvBuff = NULL;
+    struct ibv_mr *_sendMr = NULL;
+    struct ibv_mr *_recvMr = NULL;
+    std::queue<char *> _sendBuffers;
+    std::mutex _sendBuffersM;
+    rocksdb::DB *_db;
+
+    
+    void connect();
+    void registerMemory();
+    
+public:
+    
+    std::atomic<uint64_t> _requestId{12};
+
+    RdmaRepEndpoint(struct rdma_cm_id *id, int sendQueueSize, int recvQueueSize,
+                    int sendMsgSize, int recvMsgSize, rocksdb::DB *_db);
+    void processSendCompletion(struct ibv_wc *data);
+    void processRecvCompletion(struct ibv_wc *data);
+    void processDelete(struct MessageHeader *req);
+    void processGet(struct MessageHeader *req);
+    void processPut(struct MessageHeader *req);
+    int sendMessage(const char *buffer, uint32_t size);
+};
+#endif
\ No newline at end of file

code/cppfol/header/RdmaClientEndpointGroup.hpp → code/cppfol/header/RdmaRepEndpointGroup.hpp

+#ifndef __RDMAREPENDPOINTGROUP__
+#define __RDMAREPENDPOINTGROUP__
+
 #include <rdma/rdma_cma.h>
 #include <rdma/rdma_verbs.h>
 #include <stdint.h>
 #include <errno.h>
 #include <unordered_map>
-
-#ifndef __RDMACLIENTENDPOINTGROUP__
-#define __RDMACLIENTENDPOINTGROUP__
+#include <rocksdb/db.h>
 
 #include "RdmaCqProcessor.hpp"
-#include "RdmaClientEndpoint.hpp"
+#include "RdmaRepEndpoint.hpp"
+#include "RdmaClientRepEndpoint.hpp"
+#include "Executor.hpp"
 
-class RdmaClientEndpointGroup
+class RdmaRepEndpointGroup
 {
     RdmaCqProcessor *_cqProcessor = NULL;
-    //struct rdma_cm_id *_cm_id;
+    // struct rdma_cm_id *_cm_id;
 
     int _sendQueueSize;
     int _recvQueueSize;
     int _compQueueSize;
     int _sendMsgSize;
     int _recvMsgSize;
-    int _timeoutMs;
     int _maxInLine;
+    int _timeoutMs;
 
     struct rdma_event_channel *_eventChannel;
     std::thread *_cmEventThread;
-    bool _stop;
+    bool _stopCMThread;
+
+    Executor *_executor;
+     rocksdb::DB *_db;
 
 public:
-    RdmaClientEndpointGroup(int sendQueueSize, int recvQueueSize, int compQueueSize, int sendMsgSize,
-                            int recvMsgSize,int maxInLine, int timeout);
+    std::unordered_map<uint32_t, RdmaRepEndpoint *> *_qpRepEndpointMap;
+    RdmaRepEndpointGroup(int sendQueueSize, int recvQueueSize, int compQueueSize, int sendMsgSize,
+                         int recvMsgSize, int maxInLine, int timeout, rocksdb::DB *db);
     void processCmEvents();
     void processCmEvent(struct rdma_cm_event *event);
-    void start();
-    struct ibv_cq *createCq(struct rdma_cm_id *id);
-    RdmaClientEndpoint *createEndpoint();
+    void startCmProcessor();
+    void setExecutor(Executor *ex);
+    RdmaClientRepEndpoint *createEndpoint();
     void close();
-
+    struct ibv_cq *createCq(struct rdma_cm_id *id);
 };
 #endif
\ No newline at end of file

code/cppfol/header/RdmaSalCqProcessor.hpp

-#include <rdma/rdma_cma.h>
-#include <rdma/rdma_verbs.h>
-#include <stdint.h>
-#include <iostream>
-#include <thread>
-#include <unordered_map>
-
-#ifndef __RDMASALCQPROCESSOR__
-#define __RDMASALCQPROCESSOR__
-
-#include "Executor.hpp"
-
-class RdmaSalCqProcessor
-{
-public:
-    struct ibv_comp_channel *_compChannel{NULL};
-    struct ibv_cq *_completionQueue{NULL};
-    std::thread *_compQueueThread{NULL};
-    bool _stop{false};
-    Executor *_executor{NULL};
-
-    RdmaSalCqProcessor(Executor *ex, ibv_context *verbs, int compQueueSize);
-    struct ibv_cq *getCq();
-    void start();
-    void processCQEvents();
-    void close();
-};
-
-#endif

code/cppfol/header/RdmaSalEndpoint.hpp

-#ifndef __RdmaInvEndpoint__
-#define __RdmaInvEndpoint__
+#ifndef __RdmaSalEndpoint__
+#define __RdmaSalEndpoint__
 
 #include <rdma/rdma_cma.h>
 #include <rdma/rdma_verbs.h>
 #include <stdint.h>
 #include <errno.h>
 #include <iostream>
-#include <boost/lockfree/queue.hpp>
+#include <rocksdb/db.h>
 #include "RdmaEndpoint.hpp"
 #include "MessageFormats.hpp"
-#include <rocksdb/db.h>
+#include "Logger.hpp"
 
-class RdmaSalEndpoint : public RdmaEndpoint
+class RdmaSalEndpoint 
 {
 public:
+    static int CONN_STATE_INITIALIZED;
+    static int CONN_STATE_RESOURCES_ALLOCATED;
+    static int CONN_STATE_CONNECTED;
+    static int CONN_STATE_CLOSED;
+    int _state{0};
+
+    struct rdma_cm_id *_cm_id{NULL};
+    struct ibv_cq *_completionQueue{NULL};
+    struct ibv_pd *_protectionDomain{NULL};
+
+    int _sendQueueSize{0};
+    int _recvQueueSize{0};
+    int _sendMsgSize{0};
+    int _recvMsgSize{0};
+    char *_sendBuff{NULL};
+    char *_recvBuff{NULL};
+    struct ibv_mr *_sendMr{NULL};
+    struct ibv_mr *_recvMr{NULL};
+    std::queue<char*> _sendBuffers;
+    std::mutex _sendBuffersM;
 
     rocksdb::DB *_db;
+
     RdmaSalEndpoint(struct rdma_cm_id *id, struct ibv_cq *completionQueue, int sendQueueSize,
                     int recvQueueSize, int sendMsgSize, int recvMsgSize,rocksdb::DB *_db);
-
+    void createResources();
+    void processCmEvent(struct rdma_cm_event *event);
     void processCqEvent(struct ibv_wc wc);
     void processSendCompletion(struct ibv_wc *data);
     void processRecvCompletion(struct ibv_wc *data);
-    void processDelete(struct SalRequestHeader *);
-    void processGet(struct SalRequestHeader *req);
-    void processPut(struct SalRequestHeader *req);
+    void processDelete(struct MessageHeader *req);
+    void processGet(struct MessageHeader *req);
+    void processPut(struct MessageHeader *req);
     int sendMessage(const char *buffer, uint32_t size);
     void close();
 };

code/cppfol/header/RdmaServerEndpointGroup.hpp

+#ifndef __RdmaServerEndpointGroup__
+#define __RdmaServerEndpointGroup__
+
 #include <rdma/rdma_cma.h>
 #include <rdma/rdma_verbs.h>
 #include <stdint.h>
@@ -9,39 +12,38 @@
 #include <mutex>
 #include <shared_mutex>
 
-#ifndef __RDMASERVERENDPOINTGROUP__
-#define __RDMASERVERENDPOINTGROUP__
-
 #include "RdmaSalEndpoint.hpp"
+#include "RdmaServerRepEndpoint.hpp"
+#include "RdmaEndpointGroup.hpp"
 #include "CqEventData.hpp"
 #include "Executor.hpp"
-#include "RdmaSalCqProcessor.hpp"
+#include "RdmaCmProcessor.hpp"
+#include "RdmaCqProcessor.hpp"
+#include "Logger.hpp"
 
 class RdmaServerEndpointGroup
 {
     /*
-    * Variables to maintain Group state
-    */
+     * Variables to maintain Group state
+     */
     static int CONN_STATE_INITIALIZED;
     static int CONN_STATE_BINDED;
     static int CONN_STATE_CONNECTED;
     static int CONN_STATE_CLOSED;
 
-    bool _stop{false};
-    std::thread *_cmEventThread{NULL};
-    struct rdma_event_channel *_eventChannel{NULL};
+    RdmaCqProcessor *_cqProcessor{NULL};
+
     Executor *_executor;
-    
 
+    
     struct rdma_cm_id *_cm_id{NULL};
-    RdmaSalCqProcessor *_salCqProcessor{NULL};
-    std::vector<RdmaSalEndpoint *> *_salEps{NULL};
-    std::unordered_map<uint32_t, RdmaSalEndpoint *> *_qpSalEndpointMap{NULL};
+    struct rdma_event_channel *_eventChannel{NULL};
+    std::thread *_cmEventThread{NULL};
+    bool _stopCmProcessor{false};
 
-    
     /*
-    * variables to maintain queue state
-    */
+     * variables to maintain queue state
+     */
     int _sendQueueSize{0};
     int _recvQueueSize{0};
     int _compQueueSize{0};
@@ -50,23 +52,24 @@ class RdmaServerEndpointGroup
     rocksdb::DB *_db;
 
     mutable std::shared_mutex _salMutex;
+    mutable std::shared_mutex _repMutex;
 
     void clientClose();
 
 public:
-    RdmaServerEndpointGroup(int sendQueueSize, int recvQueueSize, int compQueueSize, int sendMsgSize, int recvMsgSize);
-    void bind(const char *ip, const char *port, int backlog);
+    std::unordered_map<uint32_t, RdmaSalEndpoint *> *_qpSalEndpointMap;
+    std::unordered_map<uint32_t, RdmaRepEndpoint*> *_qpRepEndpointMap;
 
-    struct ibv_cq *createSalCq(struct rdma_cm_id *id);
-    void dispatchSalCqEvents(ibv_wc wc[], int size);
-    void createExecutor(int threadSize);
+    RdmaServerEndpointGroup(int sendQueueSize, int recvQueueSize, int compQueueSize,
+                            int sendMsgSize, int recvMsgSize, rocksdb::DB *db);
+    // void setExecutor(Executor *executor);
+    void bind(const char *ip, const char *port, int backlog);
 
-    /* 
-    * Sending false will run cmProcessor on calling thread used to save creation of new thread
-    *  when main thread can also do same work
-    */
-    void startCmProcessor(bool newThread);
+    struct ibv_cq *createCq(struct rdma_cm_id *id);
+    void dispatchCqEvents(ibv_wc wc[], int size);
+    void setExecutor(Executor *ex);
     void processCmEvents();
+    void startCmProcessor(bool newThread);
     void processCmEvent(struct rdma_cm_event *event);
     void createEpCmEvent(struct rdma_cm_event *event);
     void close();

code/cppfol/header/RdmaServerRepEndpoint.hpp

+#ifndef __RdmaServerRepEndpoint__
+#define __RdmaServerRepEndpoint__
+
+#include <rdma/rdma_cma.h>
+#include <rdma/rdma_verbs.h>
+#include <stdint.h>
+#include <errno.h>
+#include <iostream>
+#include <rocksdb/db.h>
+#include "RdmaEndpoint.hpp"
+#include "MessageFormats.hpp"
+#include "Logger.hpp"
+#include "RdmaRepEndpoint.hpp"
+
+class RdmaServerRepEndpoint  : public RdmaRepEndpoint
+{
+public:
+    static int CONN_STATE_INITIALIZED;
+    static int CONN_STATE_RESOURCES_ALLOCATED;
+    static int CONN_STATE_CONNECTED;
+    static int CONN_STATE_CLOSED;
+    int _state{0};
+
+    struct ibv_cq *_completionQueue{NULL};
+    
+    RdmaServerRepEndpoint(struct rdma_cm_id *id, struct ibv_cq *completionQueue, int sendQueueSize,
+                    int recvQueueSize, int sendMsgSize, int recvMsgSize,rocksdb::DB *_db);
+    void createResources();
+    void processCmEvent(struct rdma_cm_event *event);
+    void processCqEvent(struct ibv_wc wc);
+    void close();
+};
+#endif
\ No newline at end of file

code/cppfol/header/TaskThread.hpp

 #ifndef __TaskThread__
 #define __TaskThread__
-#include "Runnable.hpp"
-#include "CqEventData.hpp"
 
-#include "ConcurrentQueue.hpp"
-#include <pthread.h>
 #include <iostream>
 #include <queue>
-#include <map>
+#include <pthread.h>
+
+#include "Runnable.hpp"
+#include "CqEventData.hpp"
+#include "MessageFormats.hpp"
+#include "Logger.hpp"
+#include "ConcurrentQueue.hpp"
+#include "RdmaRepEndpoint.hpp"
 #include "RdmaSalEndpoint.hpp"
 
 class TaskThread
 {
 
 private:
-    ConcurrentQueue<struct ibv_wc *> *_taskQueue;
-    std::unordered_map<uint32_t, RdmaSalEndpoint *> *_qpSalEndpointMap;
+    ConcurrentQueue *_taskQueue;
     bool _stop{false};
     int _id;
     pthread_t thread;
+    std::unordered_map<uint32_t, RdmaRepEndpoint *> *_clientRepMap;
+    std::unordered_map<uint32_t, RdmaRepEndpoint *> *_serverRepMap;
+    std::unordered_map<uint32_t, RdmaSalEndpoint *> *_salMap;
 
 public:
-    TaskThread(int id, int cpu, ConcurrentQueue<struct ibv_wc *> *, std::unordered_map<uint32_t, RdmaSalEndpoint *> *_qpSalEndpointMap);
-    TaskThread(int id, ConcurrentQueue<struct ibv_wc *> *, std::unordered_map<uint32_t, RdmaSalEndpoint *> *_qpSalEndpointMap);
+    TaskThread(int id, int cpu, ConcurrentQueue *,
+               std::unordered_map<uint32_t, RdmaRepEndpoint *> *clientRepMap,
+               std::unordered_map<uint32_t, RdmaRepEndpoint *> *serverRepMap,
+               std::unordered_map<uint32_t, RdmaSalEndpoint *> *salMap);
+
     void replicateSalRequest(char *salRequest, uint32_t size);
     static void *run(void *object);
     void stop();
-    void processEvent(struct ibv_wc *data);
+    void processEvent(RdmaSalEndpoint* ep,struct ibv_wc *data);
+    void processRepEvent(RdmaRepEndpoint* ep,struct ibv_wc *data);
     ~TaskThread();
 };
 

code/cppfol/prop.config

@@ -4,7 +4,21 @@
 #All Parameters will be taken as string
 # Fixed Parameters
 
-ENABLE_LOGGING=0
+sendQS=50
+recvQS=50
+compQS=50
+sendMS=500
+recvMS=500
+DB_PATH=/tmp/testdb1
+EXECUTOR_POOL_SIZE=4
+
+ENABLE_LOGGING=1
 SERVER_IP=192.168.200.20
 SERVER_PORT=1921
-EXECUTOR_POOL_SIZE=4
\ No newline at end of file
+
+FOLLOWERS=1
+FOLLOWER1_IP=192.168.200.20
+FOLLOWER1_PORT=1920
+
+FOLLOWER2_IP=192.168.200.20
+FOLLOWER2_IP=1921
\ No newline at end of file

code/cppfol/src/ConcurrentQueue.cpp

+#include <TaskThread.hpp>
+void ConcurrentQueue::push(struct ibv_wc *const &data)
+{
+    std::unique_lock<std::mutex> lock(queueMutex);
+    std::cout << "putting data\n";
+    queue1.push(data);
+    lock.unlock();
+    queueCv.notify_one();
+}
+
+bool ConcurrentQueue::empty()
+{
+    std::unique_lock<std::mutex> lock(queueMutex);
+    return queue1.empty() && queue2.empty();
+}
+
+struct ibv_wc *ConcurrentQueue::try_pop()
+{
+    struct ibv_wc *value = NULL;
+    std::unique_lock<std::mutex> lock(queueMutex);
+    /* first check in queue 2 if it is empty then check in queue 1
+     * Since queue2 is empty and if queue1 is empty we can make thread to wait
+     * Currently thread will busy wait if there are contending request in queue2
+     * ie same request is in thread 2 and same request exist in runningRequests set
+     */
+    if (queue2.empty())
+    {
+        queueCv.wait(lock, [&]
+                     { return queue1.size() > 0; });
+        value = queue1.front();
+        queue1.pop();
+    }
+    else
+    {
+        value = queue2.front();
+        queue2.pop();
+    }
+    /* At this point value will not be null because it either gets data
+     * from queue 1 or form queue2
+     * To make it sequential consistent we need to order only put requests
+     * it means ,we can return all other requests immediately
+     */
+    MessageHeader *request = (MessageHeader *)value->wr_id;
+    if (value->opcode == IBV_WC_RECV && request->type == MessageType::PUT)
+    {
+        //  std::cout<<"value "<<value<<std::endl;
+        /* Since this is the first request we need to put this in runningRequests set
+         * because this might contend in future and return this immediately
+         */
+        if (runningRequests.empty())
+        {
+            runningRequests.insert(value);
+            return value;
+        }
+        /* If this is contending with some runningRequest we need to put it inside queue2
+         * and check for other request till queue1 not become empty, if there is no request in
+         * queue1 then we will return null and taskthread will retry(probable busy waiting scenario)
+         * Currently this way will make busy waiting of thread if queue1 is empty,
+         * and it will always check in queue2 whenever it will retry for next time
+         * probable solution is to add cv and wait it until we consume that runningRequest or new request come in queue1
+         */
+        auto it = runningRequests.find(value);
+        if (it != runningRequests.end())
+        {
+            queue2.push(value);
+            // std::cout<<"found putting in 2"<<std::endl;
+            return NULL;
+        }
+        return value;
+    }
+    /* Returning all other request immediately*/
+    return value;
+}
+void ConcurrentQueue::removeFromSet(struct ibv_wc *data)
+{
+    /* Remove Request from runningRequest Set after processing it so that other threads can 
+     * process contending request from queue2
+     */
+    std::unique_lock<std::mutex> lock(queueMutex);
+    // std::cout<<"removing"<<data<<std::endl;
+    runningRequests.erase(data);
+}
+/* needs correction*/
+void ConcurrentQueue::wait_and_pop(struct ibv_wc *&popped_value)
+{
+    std::unique_lock<std::mutex> lock(queueMutex);
+    queueCv.wait(lock, [&]
+                 { return queue1.size() > 0; });
+    popped_value = queue1.front();
+    queue1.pop();
+}
\ No newline at end of file

code/cppfol/src/Executor.cpp

 #include "Executor.hpp"
-Executor::Executor(int size,std::unordered_map<uint32_t, RdmaSalEndpoint *> *qpSalEndpointMap)
-    : _size(size), _qpSalEndpointMap(qpSalEndpointMap)
+Executor::Executor(int size)
+    : _size(size)
+{
+    _taskQueue = new ConcurrentQueue();
+    // _taskThreads = new std::vector<TaskThread *>();
+    _taskThreads.reserve(size);
+}
+void Executor::createThreads(std::unordered_map<uint32_t, RdmaRepEndpoint *> *clientRepMap,
+                             std::unordered_map<uint32_t, RdmaRepEndpoint *> *serverRepMap,
+                             std::unordered_map<uint32_t, RdmaSalEndpoint *> *salMap)
 {
-    _taskQueue = new ConcurrentQueue<struct ibv_wc *>();
-    _taskThreads = new std::vector<TaskThread *>();
-    _taskThreads->reserve(size);
     for (int i = 0; i < _size; i++)
     {
-        TaskThread *thread = new TaskThread(i, _taskQueue, _qpSalEndpointMap);
-        _taskThreads->push_back(thread);
+        TaskThread *thread = new TaskThread(i, i, _taskQueue, clientRepMap,serverRepMap, salMap);
+        _taskThreads.push_back(thread);
     }
 }
- void Executor::submit(struct ibv_wc *task)
+
+void Executor::submit(struct ibv_wc *task)
 {
     _taskQueue->push(task);
 }
 void Executor::getTask()
 {
-}
\ No newline at end of file
+}
+void Executor::stop()
+{
+    for (size_t i = 0; i < _taskThreads.size(); i++)
+    {
+        _taskThreads[i]->stop();
+        delete _taskThreads[i];
+    }
+    delete _taskQueue;
+}

code/cppfol/src/Properties.cpp

-#include <string>
-#include<iostream>
-#include<fstream>
-#include<map>
+#include "Properties.hpp"
 
+std::string Properties::ltrim(const std::string &s)
+{
+    size_t start = s.find_first_not_of(_WHITESPACE);
+    return (start == std::string::npos) ? "" : s.substr(start);
+}
 
-class Properties{
-    private:
-    std::map<std::string,std::string> _props;
-     const std::string _WHITESPACE = " \n\r\t\f\v";
-    std::string ltrim(const std::string& s)
+std::string Properties::rtrim(const std::string &s)
+{
+    size_t end = s.find_last_not_of(_WHITESPACE);
+    return (end == std::string::npos) ? "" : s.substr(0, end + 1);
+}
+
+std::string Properties::trim(const std::string &s)
+{
+    return rtrim(ltrim(s));
+}
+
+Properties::Properties(std::string filename)
+{
+    // std::cout<<"Reading Properties From file named prop.config ...........\n";
+
+    std::ifstream file(filename);
+    if (!file.is_open())
     {
-        size_t start = s.find_first_not_of(_WHITESPACE);
-        return (start == std::string::npos) ? "" : s.substr(start);
+        std::cout << "Confiq file opening failed\n";
+        exit(0);
     }
- 
-    std::string rtrim(const std::string& s)
+    std::string line;
+    std::string key, value;
+    int delimPos;
+    while (getline(file, line))
     {
-        size_t end = s.find_last_not_of(_WHITESPACE);
-        return (end == std::string::npos) ? "" : s.substr(0, end + 1);
+        delimPos = line.find('#');
+        line = trim(line);
+        if (!line.empty())
+        {
+            line = line.substr(0, delimPos);
+            delimPos = line.find('=');
+            _props.insert(make_pair(trim(line.substr(0, delimPos)), trim(line.substr(delimPos + 1))));
+        }
     }
- 
-    std::string trim(const std::string& s)
+}
+std::string Properties::getValue(std::string key)
+{
+    auto it = _props.find(key);
+    if (it == _props.end())
     {
-        return rtrim(ltrim(s)); 
+        return "";
     }
-
-
-	public:
-       
-	Properties(std::string filename){
-		//std::cout<<"Reading Properties From file named prop.config ...........\n";
-	
-		std::ifstream file (filename);
-		if(!file.is_open()){
-			std::cout<<"Confiq file opening failed\n";
-			exit(0);
-		}
-		std::string line;
-        std::string key,value;
-        int delimPos;
-        while(getline(file,line)){
-            delimPos=line.find('#');
-            line=trim(line);
-            if(!line.empty()){
-                line=line.substr(0,delimPos);
-                delimPos=line.find('=');
-                _props.insert(make_pair(trim(line.substr(0,delimPos)),trim(line.substr(delimPos+1))));
-            }
-        }
-	}
-    std::string getValue(std::string key){
-        auto it=_props.find(key);
-        if(it==_props.end()){
-            return "";
-        }
-        return it->second;
-    }   
-};
\ No newline at end of file
+    return it->second;
+}
\ No newline at end of file

code/cppfol/src/RdmaCmProcessor.cpp

+#include "RdmaCmProcessor.hpp"
+#include <iostream>
+
+RdmaCmProcessor::RdmaCmProcessor(RdmaEndpointGroup *group)
+    : _endpointGroup(group)
+{
+    CPPLog::LOG_INFO("CMProcessor : Step 1 creating event channel");
+    _eventChannel = rdma_create_event_channel();
+    if (_eventChannel == NULL)
+    {
+       CPPLog::LOG_ERROR( "CMProcesor : error creating event channel");
+    }
+}
+
+struct rdma_cm_id *RdmaCmProcessor::createId()
+{
+    struct rdma_cm_id *id = NULL;
+    int ret = rdma_create_id(_eventChannel, &id, NULL, RDMA_PS_TCP);
+    if (ret == -1)
+        CPPLog::LOG_ERROR("CMProcesor : rdma_create_id failed");
+    return id;
+}
+
+void RdmaCmProcessor::processCmEvent()
+{
+    int ret;
+    struct rdma_cm_event *event;
+    CPPLog::LOG_INFO("CMProcessor : starting cm processing thread");
+    while (!_stop)
+    {
+        ret = rdma_get_cm_event(_eventChannel, &event);
+        if (ret)
+        {
+            CPPLog::LOG_ERROR("CMProcesor : rdma_get_cm_event failed");
+            continue;
+        }
+        _endpointGroup->processCmEvent(event);
+        ret = rdma_ack_cm_event(event);
+        if (ret)
+        {
+            CPPLog::LOG_ERROR("CMProcesor : rdma_ack_cm_event failed");
+        }
+    }
+}
+
+void RdmaCmProcessor::start(bool newThread)
+{
+    if (newThread == true)
+        _cmEventThread = new std::thread(&RdmaCmProcessor::processCmEvent, this);
+    else
+        processCmEvent();
+}
+
+void RdmaCmProcessor::close()
+{
+    CPPLog::LOG_ALWAYS("Closing CM Processor");
+    _stop = true;
+    if (_cmEventThread != NULL)
+        _cmEventThread->join();
+    delete _cmEventThread;
+    rdma_destroy_event_channel(_eventChannel);
+   
+}

code/cppfol/src/RdmaCqProcessor.cpp

 #include "RdmaCqProcessor.hpp"
-
-RdmaCqProcessor::RdmaCqProcessor(ibv_context *verbs, int compQueueSize)
+RdmaCqProcessor::RdmaCqProcessor(Executor *ex, ibv_context *verbs, int compQueueSize)
+    : _executor(ex)
 {
-    //_qpEndpointMap = new std::unordered_map<>();
-
-    _qpEndpointMap = new std::unordered_map<uint32_t, RdmaClientEndpoint *>();
     _compChannel = ibv_create_comp_channel(verbs);
     if (_compChannel == NULL)
     {
-        std::cout << "CqProcessr : ibv_create_comp_channel failed\n";
+        CPPLog::LOG_ERROR("CqProcessr : ibv_create_comp_channel failed");
         return;
     }
     _completionQueue = ibv_create_cq(verbs, compQueueSize, NULL, _compChannel, 0);
     if (_completionQueue == NULL)
     {
-        std::cout << "CqProcessr : ibv_create_cq failed" << std::endl;
+        CPPLog::LOG_INFO("CqProcessr : ibv_create_cq failed");
         return;
     }
     int ret = ibv_req_notify_cq(_completionQueue, 0);
     if (ret)
     {
-        std::cout << "CqProcessr : ibv_req_notify_cq failed\n";
+        CPPLog::LOG_INFO("CqProcessr : ibv_req_notify_cq failed");
     }
 }
 struct ibv_cq *RdmaCqProcessor::getCq()
 {
     return _completionQueue;
 }
-
-void RdmaCqProcessor::registerEp(uint64_t qp,RdmaClientEndpoint* ep)
-{
-    _qpEndpointMap->emplace(qp,ep);
-}
 void RdmaCqProcessor::start()
 {
-    std::cout << "CqProcessr : starting process CQ events" << std::endl;
+    CPPLog::LOG_ALWAYS("CqProcessr : starting process CQ events");
     _compQueueThread = new std::thread(&RdmaCqProcessor::processCQEvents, this);
-    pthread_setname_np(_compQueueThread->native_handle(),"compQueueThread");
+    pthread_setname_np(_compQueueThread->native_handle(),"CQProcessor");
 }
 void RdmaCqProcessor::processCQEvents()
 {
@@ -45,73 +37,56 @@ void RdmaCqProcessor::processCQEvents()
     void *context;
     const int nevent = 10;
     struct ibv_wc wc_array[nevent];
-    while (1)
+    while (!_stop)
     {
-
+        /*
+         * get_CQ_event is a blocking call and it wait save some cpu cycles but.
+         * it might not be that efficient compared to polling
+         */
         ret = ibv_get_cq_event(_compChannel, &cq, &context);
         if (ret == -1)
         {
-            std::cout << "CqProcessr : ibv_get_cq_event failed\n";
+            CPPLog::LOG_ERROR("CqProcessr : ibv_get_cq_event failed");
             close();
         }
         ibv_ack_cq_events(cq, 1);
+        /*
+         * Create a request for next completion cycle
+         */
         ret = ibv_req_notify_cq(_completionQueue, 0);
         if (ret)
         {
-            std::cout << "CqProcessr : ibv_req_notify_cq failed\n";
+            CPPLog::LOG_ERROR("CqProcessr : ibv_req_notify_cq failed");
             close();
         }
         ret = ibv_poll_cq(cq, nevent, wc_array);
         if (ret < 0)
         {
-            std::cout << "CqProcessr : ibv_poll_cq failed\n";
+            CPPLog::LOG_ERROR("CqProcessr : ibv_poll_cq failed");
             close();
         }
         if (ret == 0)
             continue;
-
-        dispatchCqEvents(wc_array, ret);
-    }
-}
-
-	inline void RdmaCqProcessor::dispatchCqEvents(ibv_wc wc[], int size)
-	{
-		for (int i = 0; i < size; i++)
-		{
-			if (wc[i].status != IBV_WC_SUCCESS)
-			{
-				std::cout << "RdmaCqProcessor : failed work completion : " << ibv_wc_status_str(wc[i].status) << " on qp " << wc[i].qp_num << std::endl;
-				return;
-			}
-			auto it = _qpEndpointMap->find(wc[i].qp_num);
-			if (it == _qpEndpointMap->end())
-			{
-				std::cout << "RdmaCqProcessor : endpoint not registered for qp num" << std::endl;
-				return;
-			}
-            switch (wc[i].opcode)
+        for (int i = 0; i < ret; i++)
+        {
+            if (wc_array[i].status != IBV_WC_SUCCESS)
             {
-            case IBV_WC_SEND:
-                
-                it->second->processSendComp(wc[i]);
-                break;
-            case IBV_WC_RECV:
-                it->second->processRecvComp(wc[i]);
-                break;
-            case IBV_WC_RDMA_WRITE:
-                std::cout << "rdma write completion\n";
-                break;
-            case IBV_WC_RDMA_READ:
-                std::cout << "rdma read completion\n";
-                break;
-            default:
-                std::cout << "RdmaCqProcessor : invalid opcode" << std::endl;
-                break;
+                std::ostringstream ss;
+                ss<< "RdmaCqProcessor : failed work completion : ";
+                ss<<ibv_wc_status_str(wc_array[i].status)<<"on qp"<<wc_array[i].qp_num;
+                CPPLog::LOG_ERROR(ss);
+                continue;
             }
-		}
-	}
-
+            struct ibv_wc *data = new struct ibv_wc(wc_array[i]);
+            _executor->submit(data);
+        }
+    }
+}
 
 void RdmaCqProcessor::close()
 {
+    _stop = true;
+    if (_compQueueThread != NULL)
+        _compQueueThread->join();
+    delete _compQueueThread;
 }
\ No newline at end of file

code/cppfol/src/RdmaEndpoint.cpp

+
 #include "RdmaEndpoint.hpp"
+#include "Logger.hpp"
 int RdmaEndpoint::CONN_STATE_INITIALIZED = 1;
 int RdmaEndpoint::CONN_STATE_RESOURCES_ALLOCATED = 2;
 int RdmaEndpoint::CONN_STATE_CONNECTED = 3;
 int RdmaEndpoint::CONN_STATE_CLOSED = 4;
 
-
 RdmaEndpoint::RdmaEndpoint(struct rdma_cm_id *id, struct ibv_cq *completionQueue, int sendQueueSize,
-                                       int recvQueueSize, int sendMsgSize, int recvMsgSize)
+                           int recvQueueSize, int sendMsgSize, int recvMsgSize)
     : _cm_id(id), _completionQueue(completionQueue), _sendQueueSize(sendQueueSize),
       _recvQueueSize(recvQueueSize), _sendMsgSize(sendMsgSize), _recvMsgSize(recvMsgSize)
 {
     _state = CONN_STATE_INITIALIZED;
-    _sendBuffers = new boost::lockfree::queue<void*>(_sendMsgSize);
 }
 void RdmaEndpoint::createResources()
 {
+    /* These states are used to avoid errors in lifetime of rdma connection
+     * more erros can be tracked in future using these lifecycle states
+     */
     if (_state != CONN_STATE_INITIALIZED)
     {
-        std::cout << "RdmaEndpoint : createResource invalid satte" << std::endl;
+        CPPLog::LOG_ERROR("RdmaEndpoint : createResource invalid state");
     }
-
+    //Step 1 to create endpoint
     _protectionDomain = ibv_alloc_pd(_cm_id->verbs);
     if (_protectionDomain == NULL)
     {
-        std::cout << "RdmaEndpoint : ibv_alloc_pd failed " << std::endl;
+        CPPLog::LOG_ERROR("RdmaEndpoint : ibv_alloc_pd failed");
         return;
     }
-
+    //step 2 Creating Queue pair with completion queueu setted for send and recieve
     struct ibv_qp_init_attr qp_init_attr;
     memset(&qp_init_attr, 0, sizeof(qp_init_attr));
-    //This is used to set endpoint address with qp
+    /*
+     *  Endpoint address is setted in QP context to get endpoint at run time with qp
+     *  without using any map to map qp_num to endpoint
+     */
     qp_init_attr.qp_context = (void *)this;
     // if not set 0, all work requests submitted to SQ will always generate a Work Completion
     qp_init_attr.sq_sig_all = 1;
@@ -49,107 +55,120 @@ void RdmaEndpoint::createResources()
     int ret = rdma_create_qp(_cm_id, _protectionDomain, &qp_init_attr);
     if (ret)
     {
-        std::cout << "RdmaEndpoint : ibv_create_cq failed\n";
+        CPPLog::LOG_ERROR("RdmaEndpoint : ibv_create_cq failed");
     }
     if (_cm_id->pd == NULL)
     {
-        std::cout << "RdmaEndpoint : pd not set" << std::endl;
+        CPPLog::LOG_ERROR("RdmaEndpoint : pd not set");
         _cm_id->pd = _protectionDomain;
     }
-    _sendBuff = (char*)malloc(_sendMsgSize * _sendQueueSize);
+    /*
+    * Step 3 register memory for send and recv queue
+    */
+    _sendBuff = new char[(_sendMsgSize * _sendQueueSize)];
     if (_sendBuff == NULL)
-        std::cout << "RdmaEndpoint :  sendBuff malloc failed" << std::endl;
-    _recvBuff = (char*)malloc(_recvMsgSize * _recvQueueSize);
+        CPPLog::LOG_ERROR("RdmaEndpoint :  sendBuff allocation failed");
 
     _sendMr = rdma_reg_write(_cm_id, reinterpret_cast<void *>(_sendBuff), _sendMsgSize * _sendQueueSize);
     if (_sendMr == NULL)
-        std::cout << "RdmaEndpoint :  sendMr reg failed" << std::endl;
-
+        CPPLog::LOG_ERROR("RdmaEndpoint :  sendMr reg failed");
+    
+    _recvBuff = new char[(_recvMsgSize * _recvQueueSize)];
     if (_recvBuff == NULL)
-        std::cout << "RdmaEndpoint :  recvBuff malloc failed" << std::endl;
+        CPPLog::LOG_ERROR("RdmaEndpoint :  recvBuff allocation failed");
     _recvMr = rdma_reg_read(_cm_id, reinterpret_cast<void *>(_recvBuff), _recvMsgSize * _recvQueueSize);
+
     if (_recvMr == NULL)
-        std::cout << "RdmaEndpoint :  recvMr reg failed" << std::endl;
+        CPPLog::LOG_ERROR("RdmaEndpoint :  recvMr reg failed");
 
+    /*
+    * adding buffers for recving rdma data
+    */
     for (int i = 0; i < _recvQueueSize; i++)
     {
-        char *const location = _recvBuff + i * _recvMsgSize;
+        char* location = _recvBuff + i * _recvMsgSize;
         rdma_post_recv(_cm_id, reinterpret_cast<void *>(location), reinterpret_cast<void *>(location),
                        _recvMsgSize, _recvMr);
     }
-    
+    /*
+    *  Adding buffers to queue for receving data
+    */
     for (int i = 0; i < _sendQueueSize; i++)
     {
-        void* const location  = _sendBuff + i * _sendMsgSize;
-        _sendBuffers->push(location);
+        char* location = _sendBuff + i * _sendMsgSize;
+        std::unique_lock<std::mutex> lock(_sendBuffersM);
+        _sendBuffers.push((char *)location);
     }
-
     _state = CONN_STATE_RESOURCES_ALLOCATED;
 }
 
-
 void RdmaEndpoint::processCmEvent(struct rdma_cm_event *event)
 {
-    std::cout << "RdmaEndpoint : Event " << rdma_event_str(event->event) << std::endl;
+    std::ostringstream ss;
+    ss<<"RdmaEndpoint : Event "<<rdma_event_str(event->event);
+    CPPLog::LOG_ALWAYS(ss);
     if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST)
     {
-        std::cout << "RdmaEndpoint : Connect request";
+        CPPLog::LOG_ALWAYS("RdmaEndpoint : Connect request");
     }
     else if (event->event == RDMA_CM_EVENT_ESTABLISHED)
     {
         if (_state != CONN_STATE_RESOURCES_ALLOCATED)
         {
-            std::cout << "RdmaEndpoint : EstablishedEvent invalid state " << std::endl;
+            CPPLog::LOG_ERROR("RdmaEndpoint : Established_Event but resource not alloted");
         }
-        std::cout << "RdmaEndpoint : step 6 Connected" << std::endl;
+        CPPLog::LOG_INFO("RdmaEndpoint : step 6 Connected");
         _state = CONN_STATE_CONNECTED;
     }
     else if (event->event == RDMA_CM_EVENT_DISCONNECTED)
     {
-        std::cout << "RdmaEndpoint : step 7 disconnected" << std::endl;
-        clientClose();
+        CPPLog::LOG_INFO("RdmaEndpoint : step 7 disconnected");
+        close();
     }
 }
 
-void RdmaEndpoint::clientClose()
+void RdmaEndpoint::close()
 {
-    if (_state != CONN_STATE_CONNECTED)
+    if (_state < CONN_STATE_RESOURCES_ALLOCATED)
     {
-        std::cout << "RdmaEndpoint :  clientClose invalid state" << std::endl;
         return;
     }
-    std::cout<<"RdmaEndpoint : closing connection qp "<<_cm_id->qp->qp_num<<  std::endl;
+    CPPLog::LOG_INFO("RdmaEndpoint : closing connection");
     int ret;
     ret = rdma_disconnect(_cm_id);
     if (ret)
     {
-        std::cout << "RdmaEndpoint : rdma_disconnect failed" << std::endl;
+        CPPLog::LOG_ERROR("RdmaEndpoint : rdma_disconnect failed");
     }
-    
+
     ret = rdma_dereg_mr(_sendMr);
     if (ret)
     {
-        std::cout << "RdmaEndpoint : rdma_dereg_mr send failed" << std::endl;
+        CPPLog::LOG_ERROR("RdmaEndpoint : rdma_dereg_mr send failed");
     }
-    free(_sendBuff);
-    
+    delete[] _sendBuff;
+
     ret = rdma_dereg_mr(_recvMr);
     if (ret)
     {
-        std::cout << "RdmaEndpoint : rdma_dereg_mr recv failed" << std::endl;
+        CPPLog::LOG_ERROR("RdmaEndpoint : rdma_dereg_mr recv failed");
     }
-    free(_recvBuff);
-    
+    delete[] _recvBuff;
+
     rdma_destroy_qp(_cm_id);
 
-    std::cout<<"des qp"<<std::endl;
-   // ret = rdma_destroy_id(_cm_id);
+    CPPLog::LOG_INFO("des qp");
+    // rdma_destroy_id(_cm_id);
+    // ret = rdma_destroy_id(_cm_id);
 
-    std::cout<<"des mr"<<std::endl;
+    CPPLog::LOG_INFO("des mr");
     if (ret)
     {
-        std::cout << "RdmaEndpoint : rdma_destroy_id failed" << std::endl;
+        CPPLog::LOG_ERROR("RdmaEndpoint : rdma_destroy_id failed");
     }
     _state = CONN_STATE_CLOSED;
-    std::cout<<"closed"<<std::endl;
+    CPPLog::LOG_INFO("closed");
 }
+
+RdmaEndpoint::~RdmaEndpoint()
+{}
\ No newline at end of file

code/cppfol/src/RdmaRepEndpoint.cpp

+#include "RdmaRepEndpoint.hpp"
+
+
+RdmaRepEndpoint::RdmaRepEndpoint(struct rdma_cm_id *id, int sendQueueSize, int recvQueueSize,
+                                 int sendMsgSize, int recvMsgSize, rocksdb::DB *db)
+    : _cm_id(id), _sendQueueSize(sendQueueSize), _recvQueueSize(recvQueueSize), _sendMsgSize(sendMsgSize),
+      _recvMsgSize(recvMsgSize), _db(db)
+{
+
+}
+
+void RdmaRepEndpoint::processSendCompletion(struct ibv_wc *data)
+{
+    /*means data has been send to other side we can use this buffer*/
+    std::unique_lock<std::mutex> lock(_sendBuffersM);
+    _sendBuffers.push((char *)data->wr_id);
+}
+
+int RdmaRepEndpoint::sendMessage(const char *buffer, uint32_t size)
+{
+    if (size > (uint32_t)_sendMsgSize)
+        return -1;
+    char *sendBuffer = nullptr;
+    std::unique_lock<std::mutex> lock(_sendBuffersM);
+    if (_sendBuffers.size() == 0)
+        return -1;
+    sendBuffer = (char*)_sendBuffers.front();
+    _sendBuffers.pop();
+    lock.unlock();
+    memcpy((void *)sendBuffer, buffer, size);
+    return rdma_post_send(_cm_id, (void *)sendBuffer, (void *)sendBuffer, size, _sendMr, 0);
+}
+
+void RdmaRepEndpoint::processRecvCompletion(struct ibv_wc *data)
+{
+    char *request = new char[data->byte_len];
+    memcpy(request, (void *)data->wr_id, data->byte_len);
+    struct MessageHeader *req = (struct MessageHeader *)request;
+    rdma_post_recv(_cm_id, (void *)data->wr_id, (void *)data->wr_id, _recvMsgSize, _recvMr);
+    if (req->type == MessageType::DELETE)
+        processDelete(req);
+    if (req->type == MessageType::GET)
+        processGet(req);
+    if (req->type == MessageType::PUT)
+        processPut(req);
+    delete[] request;
+}
+
+void RdmaRepEndpoint::processDelete(struct MessageHeader *req)
+{
+    rocksdb::Status s = _db->Delete(rocksdb::WriteOptions(), {(char *)req + MessageHeaderSize, req->keySize});
+    void *sendBuf = nullptr;
+    std::unique_lock<std::mutex> lock(_sendBuffersM);
+    if (_sendBuffers.size() == 0)
+        return;
+    sendBuf = _sendBuffers.front();
+    _sendBuffers.pop();
+    lock.unlock();
+    MessageHeader *response = (MessageHeader *)sendBuf;
+    /*This id done to avoid else case*/
+    response->type = MessageType::FAILURE;
+    response->id = req->id;
+    if (s.ok())
+    {
+        response->type = MessageType::SUCCESS;
+    }
+    rdma_post_send(_cm_id, sendBuf, sendBuf, MessageHeaderSize, _sendMr, 0);
+}
+
+void RdmaRepEndpoint::processGet(struct MessageHeader *req)
+{
+    char *sendBuf = nullptr;
+    std::unique_lock<std::mutex> lock(_sendBuffersM);
+    if (_sendBuffers.size() == 0)
+    {
+        return;
+    }
+    sendBuf = (char*)_sendBuffers.front();
+    _sendBuffers.pop();
+    lock.unlock();
+    std::string value;
+    rocksdb::Status s = _db->Get(rocksdb::ReadOptions(), {(char *)req + MessageHeaderSize, req->keySize}, &value);
+    MessageHeader *response = (MessageHeader *)sendBuf;
+    /*This id done to avoid else case*/
+    response->type = MessageType::FAILURE;
+    response->id = req->id;
+    if (s.ok())
+    {
+        response->type = MessageType::SUCCESS;
+        response->valueSize = value.size();
+        memcpy(response + MessageHeaderSize, value.c_str(), value.size());
+    }
+    rdma_post_send(_cm_id, sendBuf, sendBuf, MessageHeaderSize + value.size(), _sendMr, 0);
+}
+
+void RdmaRepEndpoint::processPut(struct MessageHeader *req)
+{
+    rocksdb::Status s = _db->Put(rocksdb::WriteOptions(), {(char *)req + MessageHeaderSize, req->keySize},
+                                 {(char *)req + MessageHeaderSize + req->keySize, req->valueSize});
+    char *sendBuf = nullptr;
+    std::unique_lock<std::mutex> lock(_sendBuffersM);
+    if (_sendBuffers.size() == 0)
+    {
+        CPPLog::LOG_ERROR("No send Buffer");
+        return;
+    }
+    sendBuf = (char*)_sendBuffers.front();
+    _sendBuffers.pop();
+    lock.unlock();
+    MessageHeader *response = (MessageHeader *)sendBuf;
+    /*This id done to avoid else case*/
+    response->type = MessageType::FAILURE;
+    response->id = req->id;
+    if (s.ok())
+        response->type = MessageType::SUCCESS;
+    rdma_post_send(_cm_id, sendBuf, sendBuf, MessageHeaderSize, _sendMr, 0);
+}

code/cppfol/src/RdmaClientEndpointGroup.cpp → code/cppfol/src/RdmaRepEndpointGroup.cpp

-#include "RdmaClientEndpointGroup.hpp"
+#include "RdmaRepEndpointGroup.hpp"
 
-RdmaClientEndpointGroup::RdmaClientEndpointGroup(int sendQueueSize, int recvQueueSize, int compQueueSize, int sendMsgSize,
-                                                 int recvMsgSize,int maxInLine, int timeout)
-    : _sendQueueSize(sendQueueSize), _recvQueueSize(recvQueueSize), _compQueueSize(compQueueSize),
-      _sendMsgSize(sendMsgSize), _recvMsgSize(recvMsgSize), _maxInLine(maxInLine),_timeoutMs(timeout)
+RdmaRepEndpointGroup::RdmaRepEndpointGroup(int sendQueueSize, int recvQueueSize, int compQueueSize, int sendMsgSize,
+                                           int recvMsgSize, int maxInLine, int timeout, rocksdb::DB *db)
+    : _sendQueueSize(sendQueueSize), _recvQueueSize(recvQueueSize), _compQueueSize(compQueueSize), _sendMsgSize(sendMsgSize),
+      _recvMsgSize(recvMsgSize), _maxInLine(maxInLine), _timeoutMs(timeout), _db(db)
 {
-     std::cout << "RdmaClientEndpointGroup : Step 1 creating event channel" << std::endl;
+    std::cout << "RdmaRepEndpointGroup : Step 1 creating event channel" << std::endl;
     _eventChannel = rdma_create_event_channel();
-    _stop = false;
+    _stopCMThread = false;
     if (_eventChannel == NULL)
     {
-        std::cout << "RdmaClientEndpointGroup : error creating event channel";
+        std::cout << "RdmaRepEndpointGroup : error creating event channel";
     }
+    _qpRepEndpointMap = new std::unordered_map<uint32_t, RdmaRepEndpoint *>();
 }
 
-void RdmaClientEndpointGroup::start()
+void RdmaRepEndpointGroup::startCmProcessor()
 {
-    _cmEventThread = new std::thread(&RdmaClientEndpointGroup::processCmEvents, this);
-    pthread_setname_np(_cmEventThread->native_handle(),"ClientCMProcessor");
+    _cmEventThread = new std::thread(&RdmaRepEndpointGroup::processCmEvents, this);
+    pthread_setname_np(_cmEventThread->native_handle(), "RepCMProcessor");
 }
 
-void RdmaClientEndpointGroup::processCmEvents()
+struct ibv_cq *RdmaRepEndpointGroup::createCq(struct rdma_cm_id *id)
+{
+    if (_cqProcessor == NULL)
+    {
+        CPPLog::LOG_ALWAYS("RdmaServerEndpointGroup : step 5 create repcq processor");
+        _cqProcessor = new RdmaCqProcessor(_executor, id->verbs, _compQueueSize);
+        _cqProcessor->start();
+    }
+    return _cqProcessor->getCq();
+}
+
+void RdmaRepEndpointGroup::processCmEvents()
 {
     int ret;
     struct rdma_cm_event *event;
-    std::cout << "RdmaClientEndpointGroup : starting cm processing thread" << std::endl;
-    while (!_stop)
+    std::cout << "RdmaRepEndpointGroup : starting cm processing thread" << std::endl;
+    while (!_stopCMThread)
     {
         ret = rdma_get_cm_event(_eventChannel, &event);
         if (ret)
         {
-            std::cout << "RdmaClientEndpointGroup : rdma_get_cm_event failed" << std::endl;
+            std::cout << "RdmaRepEndpointGroup : rdma_get_cm_event failed" << std::endl;
             continue;
         }
         processCmEvent(event);
         ret = rdma_ack_cm_event(event);
         if (ret)
         {
-            std::cout << "RdmaClientEndpointGroup : rdma_ack_cm_event failed";
+            std::cout << "RdmaRepEndpointGroup : rdma_ack_cm_event failed";
         }
     }
 }
 
-void RdmaClientEndpointGroup::processCmEvent(struct rdma_cm_event *event)
+void RdmaRepEndpointGroup::processCmEvent(struct rdma_cm_event *event)
 {
-    std::cout << "RdmaClientEndpointGroup :  event" << rdma_event_str(event->event) << std::endl;
+    std::cout << "RdmaRepEndpointGroup :  event" << rdma_event_str(event->event) << std::endl;
     if (event->id != NULL && event->id->context != NULL)
     {
         if (event->event == RDMA_CM_EVENT_ADDR_RESOLVED && event->id != NULL)
         {
-            ((RdmaClientEndpoint *)event->id->context)->createResources(createCq(event->id));
+            ((RdmaClientRepEndpoint *)event->id->context)->createResources(createCq(event->id));
         }
-        ((RdmaClientEndpoint *)event->id->context)->processCmEvent(event);
-        if(event->event == RDMA_CM_EVENT_ADDR_RESOLVED)
+        ((RdmaClientRepEndpoint *)event->id->context)->processCmEvent(event);
+        if (event->event == RDMA_CM_EVENT_ADDR_RESOLVED)
         {
-            _cqProcessor->registerEp(event->id->qp->qp_num,((RdmaClientEndpoint *)event->id->context));
+            _qpRepEndpointMap->emplace(event->id->qp->qp_num, ((RdmaRepEndpoint *)event->id->context));
+        }
+        if (event->event == RDMA_CM_EVENT_DISCONNECTED)
+        {
+            if (_qpRepEndpointMap->find(event->id->qp->qp_num) != _qpRepEndpointMap->end())
+                _qpRepEndpointMap->erase(event->id->qp->qp_num);
+            delete ((RdmaRepEndpoint *)event->id->context);
         }
-        
     }
     else
     {
-        std::cout << "RdmaClientEndpointGroup : Not able to procces CM EVent";
+        std::cout << "RdmaRepEndpointGroup : Not able to procces CM EVent";
         std::cout << rdma_event_str(event->event) << event->id << " ";
         std::cout << event->listen_id << std::endl;
     }
 }
 
-RdmaClientEndpoint *RdmaClientEndpointGroup::createEndpoint()
+RdmaClientRepEndpoint *RdmaRepEndpointGroup::createEndpoint()
 {
     struct rdma_cm_id *id = NULL;
     int ret = rdma_create_id(_eventChannel, &id, NULL, RDMA_PS_TCP);
-    std::cout<<"id "<<id<<std::endl;
     if (ret == -1)
         std::cout << "CMProcesor : rdma_create_id failed" << std::endl;
-    RdmaClientEndpoint *endpoint = new RdmaClientEndpoint(id,
-                                                          _sendQueueSize, _recvQueueSize,
-                                                          _sendMsgSize, _recvMsgSize,_maxInLine, _timeoutMs);
+    RdmaClientRepEndpoint *endpoint = new RdmaClientRepEndpoint(id, _sendQueueSize, _recvQueueSize, _sendMsgSize,
+                                                                _recvMsgSize, _maxInLine, _timeoutMs, _db);
     id->context = (void *)endpoint;
     return endpoint;
 }
 
-struct ibv_cq *RdmaClientEndpointGroup::createCq(struct rdma_cm_id *id)
+void RdmaRepEndpointGroup::setExecutor(Executor *ex)
 {
-    if (_cqProcessor == NULL)
-    {
-        std::cout << "RdmaClientEndpointGroup : Creating CQ processor" << std::endl;
-        _cqProcessor = new RdmaCqProcessor(id->verbs, _compQueueSize);
-        _cqProcessor->start();
-    }
-    return _cqProcessor->getCq();
+    _executor = ex;
 }
 
-void RdmaClientEndpointGroup::close()
+void RdmaRepEndpointGroup::close()
 {
-    _stop = true;
+    _stopCMThread = true;
     _cmEventThread->join();
+    _cqProcessor->close();
+    delete _cmEventThread;
+    delete _cqProcessor;
+    delete _qpRepEndpointMap;
     rdma_destroy_event_channel(_eventChannel);
 }
\ No newline at end of file

code/cppfol/src/RdmaSalCqProcessor.cpp

-#include "RdmaSalCqProcessor.hpp"
-RdmaSalCqProcessor::RdmaSalCqProcessor(Executor *ex, ibv_context *verbs, int compQueueSize)
-        : _executor(ex)
-    {
-        _compChannel = ibv_create_comp_channel(verbs);
-        if (_compChannel == NULL)
-        {
-            std::cout << "SalCqProcessr : ibv_create_comp_channel failed\n";
-            return;
-        }
-        _completionQueue = ibv_create_cq(verbs, compQueueSize, NULL, _compChannel, 0);
-        if (_completionQueue == NULL)
-        {
-            std::cout << "SalCqProcessr : ibv_create_cq failed" << std::endl;
-            return;
-        }
-        int ret = ibv_req_notify_cq(_completionQueue, 0);
-        if (ret)
-        {
-            std::cout << "SalCqProcessr : ibv_req_notify_cq failed\n";
-        }
-    }
-    struct ibv_cq *RdmaSalCqProcessor::getCq()
-    {
-        return _completionQueue;
-    }
-    void RdmaSalCqProcessor::start()
-    {
-        std::cout << "SalCqProcessr : starting process CQ events" << std::endl;
-        _compQueueThread = new std::thread(&RdmaSalCqProcessor::processCQEvents, this);
-    }
-    void RdmaSalCqProcessor::processCQEvents()
-    {
-        int ret = 0;
-        struct ibv_cq *cq;
-        void *context;
-        const int nevent = 10;
-        struct ibv_wc wc_array[nevent];
-        while (!_stop)
-        {
-            /*
-            * get_CQ_event is a blocking call and it wait save some cpu cycles but.
-            * it might not be that efficient compared to polling
-            */
-            ret = ibv_get_cq_event(_compChannel, &cq, &context);
-            if (ret == -1)
-            {
-                std::cout << "SalCqProcessr : ibv_get_cq_event failed\n";
-                close();
-            }
-            ibv_ack_cq_events(cq, 1);
-            /* 
-            * Create a request for next completion cycle
-            */       
-            ret = ibv_req_notify_cq(_completionQueue, 0);
-            if (ret)
-            {
-                std::cout << "SalCqProcessr : ibv_req_notify_cq failed\n";
-                close();
-            }
-            ret = ibv_poll_cq(cq, nevent, wc_array);
-            if (ret < 0)
-            {
-                std::cout << "SalCqProcessr : ibv_poll_cq failed\n";
-                close();
-            }
-            if (ret == 0)
-                continue;
-            for (int i = 0; i < ret; i++)
-            {
-                struct ibv_wc *data = new struct ibv_wc(wc_array[i]);
-                /*
-                * vendor_err is set to check whether the request came from sal or followers
-                * data->vendor_err = 0;
-                */
-                _executor->submit(data);
-            }
-            //           _executor->dispatchSalCqEvents(wc_array, ret);
-        }
-    }
-
-    void RdmaSalCqProcessor::close()
-    {
-        _stop = true;
-        if (_compQueueThread != NULL)
-            _compQueueThread->join();
-    }
\ No newline at end of file

code/cppfol/src/RdmaServerRepEndpoint.cpp

+#include "RdmaServerRepEndpoint.hpp"
+int RdmaServerRepEndpoint::CONN_STATE_INITIALIZED = 1;
+int RdmaServerRepEndpoint::CONN_STATE_RESOURCES_ALLOCATED = 2;
+int RdmaServerRepEndpoint::CONN_STATE_CONNECTED = 3;
+int RdmaServerRepEndpoint::CONN_STATE_CLOSED = 4;
+
+
+RdmaServerRepEndpoint::RdmaServerRepEndpoint(struct rdma_cm_id *id, struct ibv_cq *completionQueue, int sendQueueSize,
+                                 int recvQueueSize, int sendMsgSize, int recvMsgSize, rocksdb::DB *db)
+    : RdmaRepEndpoint(id,sendQueueSize, recvQueueSize, sendMsgSize ,recvMsgSize ,db),_completionQueue(completionQueue)
+{
+    _state = CONN_STATE_INITIALIZED;
+}
+
+void RdmaServerRepEndpoint::createResources()
+{
+    /* These states are used to avoid errors in lifetime of rdma connection
+     * more erros can be tracked in future using these lifecycle states
+     */
+    if (_state != CONN_STATE_INITIALIZED)
+    {
+        CPPLog::LOG_ERROR("RdmaEndpoint : createResource invalid state");
+    }
+    // Step 1 to create endpoint
+    _protectionDomain = ibv_alloc_pd(_cm_id->verbs);
+    if (_protectionDomain == NULL)
+    {
+        CPPLog::LOG_ERROR("RdmaEndpoint : ibv_alloc_pd failed");
+        return;
+    }
+    // step 2 Creating Queue pair with completion queueu setted for send and recieve
+    struct ibv_qp_init_attr qp_init_attr;
+    memset(&qp_init_attr, 0, sizeof(qp_init_attr));
+    /*
+     *  Endpoint address is setted in QP context to get endpoint at run time with qp
+     *  without using any map to map qp_num to endpoint
+     */
+    qp_init_attr.qp_context = (void *)this;
+    // if not set 0, all work requests submitted to SQ will always generate a Work Completion
+    qp_init_attr.sq_sig_all = 1;
+    // completion queue can be shared or you can use distinct completion queues.
+    qp_init_attr.send_cq = _completionQueue;
+    qp_init_attr.recv_cq = _completionQueue;
+    qp_init_attr.qp_type = IBV_QPT_RC;
+    // increase if you want to keep more send work requests in the SQ.
+    qp_init_attr.cap.max_send_wr = _sendQueueSize;
+    // increase if you want to keep more receive work requests in the RQ.
+    qp_init_attr.cap.max_recv_wr = _recvQueueSize;
+    // increase if you allow send work requests to have multiple scatter gather entry (SGE).
+    qp_init_attr.cap.max_send_sge = 1;
+    // increase if you allow receive work requests to have multiple scatter gather entry (SGE).
+    qp_init_attr.cap.max_recv_sge = 1;
+
+    int ret = rdma_create_qp(_cm_id, _protectionDomain, &qp_init_attr);
+    if (ret)
+    {
+        CPPLog::LOG_ERROR("RdmaEndpoint : ibv_create_cq failed");
+    }
+    if (_cm_id->pd == NULL)
+    {
+        CPPLog::LOG_ERROR("RdmaEndpoint : pd not set");
+        _cm_id->pd = _protectionDomain;
+    }
+    /*
+     * Step 3 register memory for send and recv queue
+     */
+    _sendBuff = new char[(_sendMsgSize * _sendQueueSize)];
+    if (_sendBuff == NULL)
+        CPPLog::LOG_ERROR("RdmaEndpoint :  sendBuff allocation failed");
+
+    _sendMr = rdma_reg_write(_cm_id, reinterpret_cast<void *>(_sendBuff), _sendMsgSize * _sendQueueSize);
+    if (_sendMr == NULL)
+        CPPLog::LOG_ERROR("RdmaEndpoint :  sendMr reg failed");
+
+    _recvBuff = new char[(_recvMsgSize * _recvQueueSize)];
+    if (_recvBuff == NULL)
+        CPPLog::LOG_ERROR("RdmaEndpoint :  recvBuff allocation failed");
+    _recvMr = rdma_reg_read(_cm_id, reinterpret_cast<void *>(_recvBuff), _recvMsgSize * _recvQueueSize);
+
+    if (_recvMr == NULL)
+        CPPLog::LOG_ERROR("RdmaEndpoint :  recvMr reg failed");
+
+    /*
+     * adding buffers for recving rdma data
+     */
+    for (int i = 0; i < _recvQueueSize; i++)
+    {
+        char *location = _recvBuff + i * _recvMsgSize;
+        rdma_post_recv(_cm_id, reinterpret_cast<void *>(location), reinterpret_cast<void *>(location),
+                       _recvMsgSize, _recvMr);
+    }
+    /*
+     *  Adding buffers to queue for receving data
+     */
+    for (int i = 0; i < _sendQueueSize; i++)
+    {
+        char *location = _sendBuff + i * _sendMsgSize;
+        std::unique_lock<std::mutex> lock(_sendBuffersM);
+        _sendBuffers.push((char *)location);
+    }
+    _state = CONN_STATE_RESOURCES_ALLOCATED;
+}
+
+void RdmaServerRepEndpoint::processCmEvent(struct rdma_cm_event *event)
+{
+    std::ostringstream ss;
+    ss << "RdmaEndpoint : Event " << rdma_event_str(event->event);
+    CPPLog::LOG_ALWAYS(ss);
+    if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST)
+    {
+        CPPLog::LOG_ALWAYS("RdmaEndpoint : Connect request");
+    }
+    else if (event->event == RDMA_CM_EVENT_ESTABLISHED)
+    {
+        if (_state != CONN_STATE_RESOURCES_ALLOCATED)
+        {
+            CPPLog::LOG_ERROR("RdmaEndpoint : Established_Event but resource not alloted");
+        }
+        CPPLog::LOG_INFO("RdmaEndpoint : step 6 Connected");
+        _state = CONN_STATE_CONNECTED;
+    }
+    else if (event->event == RDMA_CM_EVENT_DISCONNECTED)
+    {
+        CPPLog::LOG_INFO("RdmaEndpoint : step 7 disconnected");
+        close();
+    }
+}
+
+void RdmaServerRepEndpoint::close()
+{
+    if (_state < CONN_STATE_RESOURCES_ALLOCATED)
+    {
+        return;
+    }
+    CPPLog::LOG_INFO("RdmaEndpoint : closing connection");
+    int ret;
+    ret = rdma_disconnect(_cm_id);
+    if (ret)
+    {
+        CPPLog::LOG_ERROR("RdmaEndpoint : rdma_disconnect failed");
+    }
+
+    ret = rdma_dereg_mr(_sendMr);
+    if (ret)
+    {
+        CPPLog::LOG_ERROR("RdmaEndpoint : rdma_dereg_mr send failed");
+    }
+    delete[] _sendBuff;
+
+    ret = rdma_dereg_mr(_recvMr);
+    if (ret)
+    {
+        CPPLog::LOG_ERROR("RdmaEndpoint : rdma_dereg_mr recv failed");
+    }
+    delete[] _recvBuff;
+
+    rdma_destroy_qp(_cm_id);
+
+    CPPLog::LOG_INFO("des qp");
+    // rdma_destroy_id(_cm_id);
+    // ret = rdma_destroy_id(_cm_id);
+
+    CPPLog::LOG_INFO("des mr");
+    if (ret)
+    {
+        CPPLog::LOG_ERROR("RdmaEndpoint : rdma_destroy_id failed");
+    }
+    _state = CONN_STATE_CLOSED;
+    CPPLog::LOG_INFO("closed");
+}

code/cppfol/src/TaskThread.cpp

 #include "TaskThread.hpp"
-#include "MessageFormats.hpp"
-TaskThread::TaskThread(int id, int cpu, ConcurrentQueue<struct ibv_wc *> *taskqueue, std::unordered_map<uint32_t, RdmaSalEndpoint *> *qpSalEndpointMap)
-    : _id(id), _qpSalEndpointMap(qpSalEndpointMap)
+
+TaskThread::TaskThread(int id, int cpu, ConcurrentQueue *taskqueue,
+                       std::unordered_map<uint32_t, RdmaRepEndpoint *> *clientRepMap,
+                       std::unordered_map<uint32_t, RdmaRepEndpoint *> *serverRepMap,
+                       std::unordered_map<uint32_t, RdmaSalEndpoint *> *salMap)
+    : _id(id), _clientRepMap(clientRepMap), _serverRepMap(serverRepMap), _salMap(salMap)
 {
     _taskQueue = taskqueue;
     if (pthread_create(&thread, NULL, &TaskThread::run, this))
     {
-        std::cout << "pthread create has been failed while creating taskthread " << std::endl;
+        CPPLog::LOG_ERROR("pthread create has been failed while creating taskthread");
         exit(0);
     }
     cpu_set_t cpuset;
     CPU_ZERO(&cpuset);
     CPU_SET(cpu, &cpuset);
+    std::ostringstream ss;
+    ss << "New Thread Setting CPU affinty " << cpu;
+    CPPLog::LOG_ALWAYS(ss);
     if (pthread_setaffinity_np(thread, sizeof(cpu_set_t), &cpuset) != 0)
     {
-        std::cerr << "Error calling pthread_setaffinity_np: "
-                  << "\n";
-    }
-}
-
-TaskThread::TaskThread(int id, ConcurrentQueue<struct ibv_wc *> *taskqueue, std::unordered_map<uint32_t, RdmaSalEndpoint *> *qpSalEndpointMap)
-    : _id(id), _qpSalEndpointMap(qpSalEndpointMap)
-{
-    _taskQueue = taskqueue;
-    if (pthread_create(&thread, NULL, &TaskThread::run, this))
-    {
-        std::cout << "pthread create has been failed while creating taskthread " << std::endl;
-        exit(0);
+        CPPLog::LOG_ERROR("Error calling pthread_setaffinity_np ");
     }
+    pthread_setname_np(thread, "TaskThread");
 }
 
 TaskThread::~TaskThread()
 {
-    std::cout << "Task Destructed" << std::endl;
+    CPPLog::LOG_INFO("TaskThread Destructed");
     stop();
 }
+
 void TaskThread::stop()
 {
     _stop = true;
     if (pthread_join(thread, NULL) == 0)
     {
-        std::cout << "pthread join failed" << std::endl;
+        CPPLog::LOG_ERROR("pthread join failed");
     }
 }
+
 inline void *TaskThread::run(void *object)
 {
+    /*
+     * This is because data from pthread_create is passed as void*
+     */
     TaskThread *thread = reinterpret_cast<TaskThread *>(object);
-    std::cout << "running task thread" << thread->_id << std::endl;
+    std::ostringstream ss;
+    ss<<"Running task thread"<<thread->_id;
+    CPPLog::LOG_ALWAYS(ss);
     while (!thread->_stop)
     {
         struct ibv_wc *data = NULL;
-        thread->_taskQueue->wait_and_pop(data);
-        thread->processEvent(data);
+        std::cout << "Get start\n";
+        data = thread->_taskQueue->try_pop();
+        if (data != NULL)
+        {
+            std::cout << "TaskThread:: got data";
+            if (data == NULL || data->status != IBV_WC_SUCCESS)
+            {
+                std::ostringstream ss;
+                ss << "TaskThread : failed work completion : ";
+                ss << ibv_wc_status_str(data->status) << " on qp " << data->qp_num;
+                CPPLog::LOG_ERROR(ss);
+                continue;
+            }
+            RdmaSalEndpoint *salEp = nullptr;
+            RdmaRepEndpoint *repEp = nullptr;
+            auto it = thread->_salMap->find(data->qp_num);
+            if (it != thread->_salMap->end())
+            {
+                salEp = it->second;
+            }
+            auto it2 = thread->_clientRepMap->find(data->qp_num);
+            if (it2 != thread->_clientRepMap->end())
+            {
+                repEp = it2->second;
+            }
+            else
+            {
+                auto it3 = thread->_serverRepMap->find(data->qp_num);
+                if(it3 != thread->_serverRepMap->end())
+                    repEp = it3->second;
+            }
+            if (salEp == nullptr && repEp == nullptr)
+            {
+                std::ostringstream ss;
+                ss<<"RdmaSal : endpoint not registered for qp"<<data->qp_num;
+                CPPLog::LOG_INFO(ss);
+                
+                continue;
+            }
+            else if (salEp != nullptr)
+                thread->processEvent(salEp, data);
+            else if (repEp != nullptr)
+                thread->processRepEvent(repEp, data);
+            thread->_taskQueue->removeFromSet(data);
+            delete data;
+        }
     }
     return NULL;
 }
 
-void TaskThread::processEvent(struct ibv_wc *data)
+void TaskThread::processEvent(RdmaSalEndpoint *ep, struct ibv_wc *data)
 {
-    if (data == NULL || data->status != IBV_WC_SUCCESS)
+    std::cout<<"processing sal event\n";
+    /* sal Request*/
+    switch (data->opcode)
     {
-        std::cout << "TaskThread : failed work completion : ";
-        std::cout << ibv_wc_status_str(data->status) << " on qp " << data->qp_num << std::endl;
-        return;
-    }
-    /*
-     * Process Request from client
-     */
-
-    auto it = _qpSalEndpointMap->find(data->qp_num);
-    if (it == _qpSalEndpointMap->end())
+    case IBV_WC_SEND:
+        ep->processSendCompletion(data);
+        break;
+    case IBV_WC_RECV:
     {
-        std::cout << data->qp_num << "RdmaSal : endpoint not registered for qp num\n";
-        return;
+        // it->second->processRecvCompletion(data);
+        char *buffer = new char[data->byte_len];
+        memcpy(buffer, (void *)data->wr_id, data->byte_len);
+        rdma_post_recv(ep->_cm_id, (void *)data->wr_id, (void *)data->wr_id,
+                       ep->_recvMsgSize, ep->_recvMr);
+        struct MessageHeader *req = (struct MessageHeader *)buffer;
+        std::cout << "TaskThread 1\n";
+        switch (req->type)
+        {
+        case MessageType::GET:
+            ep->processGet(req);
+            break;
+        case MessageType::DELETE:
+                replicateSalRequest(buffer, data->byte_len);
+            ep->processDelete(req);
+            break;
+        case MessageType::PUT:
+                replicateSalRequest(buffer, data->byte_len);
+            ep->processPut(req);
+            break;
+        default:
+            CPPLog::LOG_ERROR("SalRequest invalid req type");
+            break;
+        }
+        delete[] buffer;
     }
+    break;
+    default:
+        std::ostringstream ss;
+        ss << "TaskThread default opcode : " << data->opcode;
+        CPPLog::LOG_INFO(ss);
+        break;
+    }
+}
+
+void TaskThread::processRepEvent(RdmaRepEndpoint *ep, struct ibv_wc *data)
+{
     switch (data->opcode)
     {
     case IBV_WC_SEND:
-        it->second->processSendCompletion(data);
+        ep->processSendCompletion(data);
         break;
     case IBV_WC_RECV:
     {
         // it->second->processRecvCompletion(data);
         char *buffer = new char[data->byte_len];
         memcpy(buffer, (void *)data->wr_id, data->byte_len);
-        rdma_post_recv(it->second->_cm_id, (void *)data->wr_id, (void *)data->wr_id,
-                       it->second->_recvMsgSize, it->second->_recvMr);
-        struct SalRequestHeader *req = (struct SalRequestHeader *)buffer;
-        std::cout << "recieve id : " << req->id << " " << (char *)req + SalRequestHeaderSize;
-        std::cout << " " << req->type << "size" << data->byte_len << "\n";
+        rdma_post_recv(ep->_cm_id, (void *)data->wr_id, (void *)data->wr_id,
+                       ep->_recvMsgSize, ep->_recvMr);
+        struct MessageHeader *req = (struct MessageHeader *)buffer;
+        std::cout << "TaskThread 1\n";
         switch (req->type)
         {
-        case RequestType::GET:
-            it->second->processGet(req);
+        case MessageType::GET:
+            ep->processGet(req);
             break;
-        case RequestType::DELETE:
-            std::cout<<"TaskThread:: incorrect delete request from client to follower"<<std::endl;
+        case MessageType::DELETE:
+            ep->processDelete(req);
             break;
-        case RequestType::PUT:
-            std::cout<<"TaskThread:: incorrect put request from client to follower"<<std::endl;
+        case MessageType::PUT:
+            ep->processPut(req);
             break;
         default:
-            std::cout << "SalRequest invalid req type";
+            CPPLog::LOG_ERROR("SalRequest invalid req type");
             break;
         }
         delete[] buffer;
     }
     break;
-    case IBV_WC_RDMA_WRITE:
-        std::cout << "rdma write completion\n";
-        break;
-    case IBV_WC_RDMA_READ:
-        std::cout << "rdma read completion\n";
-        break;
     default:
-        std::cout << "TaskThread default opcode : " << data->opcode << std::endl;
+        std::ostringstream ss;
+        ss << "TaskThread default opcode : " << data->opcode;
+        CPPLog::LOG_INFO(ss);
         break;
     }
+}
+
+void TaskThread::replicateSalRequest(char *req, uint32_t size)
+{
+    auto repIt = _clientRepMap->begin();
+    for (; repIt != _clientRepMap->end(); repIt++)
+    {
+        repIt->second->sendMessage(req, size);
+    }
+    auto serverRepIt = _serverRepMap->begin();
+    for (; serverRepIt != _serverRepMap->end(); serverRepIt++)
+    {
+        serverRepIt->second->sendMessage(req, size);
+    }
+
+    MessageHeader *salReq = (MessageHeader *)req;
+    char *buffer = new char[MessageHeaderSize + salReq->keySize];
+    MessageHeader *invRequest = (MessageHeader *)(buffer);
+    invRequest->type = MessageType::INVALIDATE;
+    invRequest->id = salReq->id;
+    invRequest->keySize = salReq->keySize;
+    memcpy(buffer + MessageHeaderSize, salReq + MessageHeaderSize, salReq->keySize);
+    // Send Invalidation to sal's
+    auto salIt = _salMap->begin();
+    for (;salIt != _salMap->end();salIt++)
+    {
+        salIt->second->sendMessage(buffer, MessageHeaderSize + salReq->keySize);
+    }
+    delete[] buffer;
 }
\ No newline at end of file

code/cppfol/src/fol.cpp

 #include <iostream>
 #include "RdmaServerEndpointGroup.hpp"
-#include "RdmaClientEndpointGroup.hpp"
+#include "RdmaRepEndpointGroup.hpp"
 #include "RdmaEndpoint.hpp"
 #include "Executor.hpp"
-
+#include "Properties.hpp"
 #include "rocksdb/db.h"
 #include "rocksdb/slice.h"
 #include "rocksdb/options.h"
 
+int connectToRepServer(Properties &prop, RdmaRepEndpointGroup* repGroup)
+{
+    int followers = stoi(prop.getValue("FOLLOWERS"));
+    std::cout<<"followers "<<followers<<"\n";
+    RdmaClientRepEndpoint* clientEPs[followers];
+    for(int i = 0 ;i< followers ;i++)
+    {
+        clientEPs[i] = repGroup->createEndpoint();
+        std::string ip = prop.getValue("FOLLOWER"+std::to_string(i+1)+"_IP");
+        std::string port = prop.getValue("FOLLOWER"+std::to_string(i+1)+"_PORT");
+        std::cout<<"Connecting to follower "<<ip<<":"<<port<<"\n";
+        clientEPs[i]->connect(ip.c_str(), port.c_str(), "fol");
+    }
+   return 0;
+}
 int main()
 {
-    RdmaClientEndpointGroup *clgroup = new RdmaClientEndpointGroup(5, 5, 5, 50, 50, 0, 1000);
-    clgroup->start();
-     RdmaClientEndpoint *clientEp = clgroup->createEndpoint();
-    clientEp->connect("192.168.200.20", "1921", "fol");
-    while (!clientEp->isConnected());
-    std::cout << "client : connected" << std::endl;
+    std::cout << "Starting Server Main Thread\n";
+    Properties prop("prop.config");
+    int sendQS = stoi(prop.getValue("sendQS"));
+    int recvQS = stoi(prop.getValue("recvQS"));
+    int compQS = stoi(prop.getValue("compQS"));
+    int sendMS = stoi(prop.getValue("sendMS"));
+    int recvMS = stoi(prop.getValue("recvMS"));
+    std::string dbpath = prop.getValue("DB_PATH");
+    std::string serverIP = prop.getValue("SERVER_IP");
+    std::string serverPort = prop.getValue("SERVER_PORT");
+    int executorPoolSize = stoi(prop.getValue("EXECUTOR_POOL_SIZE"));
+    int enableLogging = stoi(prop.getValue("ENABLE_LOGGING"));
+    if (enableLogging == 0)
+        CPPLog::Logger::getInstance()->updateLogLevel(CPPLog::DISABLE_LOG);
+
+    rocksdb::DB *db;
+    rocksdb::Options options;
+    options.create_if_missing = true;
+    // open a database with a name which corresponds to a file system directory
+    rocksdb::Status status = rocksdb::DB::Open(options, dbpath, &db);
+    if (!status.ok())
+    {
+        CPPLog::LOG_ERROR(status.ToString().c_str());
+        exit(1);
+    }
+    CPPLog::LOG_ALWAYS("Rocks started");
+
+    Executor *executor = new Executor(executorPoolSize);
+
+    RdmaRepEndpointGroup *repgroup = new RdmaRepEndpointGroup(sendQS, recvQS, compQS, sendMS, recvMS, 1, 100000, db);
+    RdmaServerEndpointGroup *sgroup = new RdmaServerEndpointGroup(sendQS, recvQS, compQS, sendMS, recvMS, db);
+
+    executor->createThreads(repgroup->_qpRepEndpointMap, sgroup->_qpRepEndpointMap, sgroup->_qpSalEndpointMap);
+    repgroup->setExecutor(executor);
+    sgroup->setExecutor(executor);
+    repgroup->startCmProcessor();
+    sgroup->bind(serverIP.c_str(), serverPort.c_str(), 2);
+    std::thread t(connectToRepServer, std::ref(prop), (repgroup));
 
-    RdmaServerEndpointGroup *sgroup = new RdmaServerEndpointGroup(5, 5, 5, 50, 50);
-    sgroup->createExecutor(4);
-    sgroup->bind("192.168.200.20", "1920", 2);
     sgroup->startCmProcessor(false);
+
     std::cout << "rhdhj" << std::endl;
     while (1)
         ;
-}
\ No newline at end of file
+}