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Postgres FD Implementation
Commit a7833790 authored by Bruce Momjian's avatar Bruce Momjian
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......@@ -1801,3 +1801,275 @@ TIP 5: Have you checked our extensive FAQ?
http://www.postgresql.org/users-lounge/docs/faq.html
From pgsql-hackers-owner+M16317=candle.pha.pa.us=pgman@postgresql.org Thu Dec 6 10:11:27 2001
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Date: Wed, 05 Dec 2001 20:39:28 +0100
From: Laszlo Hornyak <hornyakl@freemail.hu>
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To: Barry Lind <barry@xythos.com>, pgsql-hackers@postgresql.org,
pgsql-jdbc@postgresql.org
Subject: Re: [HACKERS] [GENERAL] java stored procedures
References: <3C074DE4.9040905@freemail.hu> <3C0BE325.3020809@xythos.com> <3C0C937E.9000405@freemail.hu> <3C0CFD82.1030600@xythos.com> <3C0D219C.1090804@freemail.hu> <3C0D799D.4010808@xythos.com> <3C0DE382.1050400@freemail.hu> <3C0E5A23.7060701@xythos.com>
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Barry Lind wrote:
>
> I also stopped cc'ing the general list, since this is getting too
> detailed for most of the members on that list.
Ok.
> Now to your mail:
>
> This seems like a reasonable approach and should work across different
> JVMs. It would probably be a good experiment to try this with the Sun
> or IBM jvm at some point to verify. What I was afraid of was that you
> were hacking the Kaffe code to perform the integration which would
> limit this solution to only using Kaffe.
I am sure they wont work the same way. I think I have a sun jdk 1.3.0-2,
so I will try to port it soon. The IBM implementation must wait I think
until january.
>
> Just a suggestion: PL/J might be a good name, since as you probably
> know it can't be called pl/java because of the trademark restrictions
> on the word 'java'.
Ok, you won, I do not read the licenses. From now it`s name is pl/j.
Isn`t 'j' too short for the name of the process that runns java? :)
>
> I am a little concerned about the stability and complexity of having
> this '-pizza' program be responsible for handling the calls on the
> java side. My concern is that this will need to be a multithreaded
> program since multiple backends will concurrently be needing to
> interact with multiple java threads through this one program. It
> might be simpler if each postgres process directly communicated to a
> java thread via a tcpip socket. Then the "-pizza" program would only
> need to be responsible for starting up the jvm and creating java
> threads and sockets for a postgres process (it would perform a similar
> role to postmaster for postgres client connections).
With good design we can solve stability problems. As much as I know, if
postmaster dies, the postgres server becomes unavailable, this looks the
same problem. I do not know if we realy need sockets. Anyway, if 'j'
dies, we can create a new one, and restart calculations. Some watchdog
functionality...
Doing thing with sockets need a lot of rework. It is the best time for
this, while there is not too much thing done.
>>>
>>>> -when java thread receives the signal, it reads the message(s) from
>>>> the queue, and starts some actions. When done it tells postgres
>>>> with a signal that it is ready, and it can come for its results.
>>>> This will be rewritten see below problems.
>>>
>>> Are signals the best way to accomplish this?
>>
>> I don`t know if it is the best, it is the only way I know :)
>> Do you know any other ways?
>>
> I don't know, but hopefully someone on the hackers list will chip in
> here with a comment.
After a first developement cycle (if my brain doesn`t burn down), the
signals can be replaced to a plugable communication interface I think.
So maybe we can use CORBA, or sockets, or something else. This will take
a lot of time.
> OK, so the same backend process that called the function gets messaged
> to process the sql. This should work. However it means you will need
> a special version of the jdbc driver that uses this shm+signals
> communication mechanism instead of what the current jdbc driver does.
> This is something I would be happy to help you with.
This is kind of you. :)
For this, I will have to finish the protocol of communication. I have to
learn Postgres enough, so I am not sure this will be done this weekend.
I have ideas, only time is needed to implement them or to recognize the
failures.
Thanks,
Laszlo Hornyak
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Date: Thu, 06 Dec 2001 15:23:39 +0100
From: Laszlo Hornyak <hornyakl@freemail.hu>
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To: Gunnar =?ISO-8859-1?Q?R=F8nning?= <gunnar@polygnosis.com>
cc: Barry Lind <barry@xythos.com>, pgsql-hackers@postgresql.org,
pgsql-jdbc@postgresql.org
Subject: Re: [HACKERS] [GENERAL] java stored procedures
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Hi!
Sorry, I have time only for short ansvers, it is company time :((.
Gunnar Rnning wrote:
>* Barry Lind <barry@xythos.com> wrote:
>|
>| possible problems with your strategy). Without knowing what exactly
>| you are thinking of doing it is difficult to comment.
>
>Agreed.
>
Ok, I will try to bring the code here before Monday, or at least some
pieces. It is full of hardcoded constants from my developement
environment. :(
>
>| I am very interested in hearing what your plans are for pl/java. I
>| think this is a very difficult project, but one that would be very
>| useful and welcome.
>
>I would very much like to hear about the plans myself.
>
I do not see so big difficulities yet, am I so lame? It won`t be easy,
realy, we should keep it simple, at least becouse of me.
thanks,
Laszlo Hornyak
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Date: Thu, 06 Dec 2001 23:02:51 +0500
From: Hannu Krosing <hannu@tm.ee>
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To: hornyakl@users.sourceforge.net
cc: Gunnar =?ISO-8859-1?Q?R=F8nning?= <gunnar@polygnosis.com>,
Barry Lind
<barry@xythos.com>, pgsql-hackers@postgresql.org,
pgsql-jdbc@postgresql.org
Subject: Re: [HACKERS] [GENERAL] java stored procedures
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Laszlo Hornyak wrote:
>>
>> | I am very interested in hearing what your plans are for pl/java. I
>> | think this is a very difficult project, but one that would be very
>> | useful and welcome.
>>
>> I would very much like to hear about the plans myself.
>
> I do not see so big difficulities yet, am I so lame? It won`t be easy,
> realy, we should keep it simple, at least becouse of me.
Let me propose a very different approach to PL/J - use gcc-java and
figure out the problems
with (dynamic) compiling and dynamic linking.
This is an approach somewhat similar to .NET/C# that you first compile
things and then run instead
of trying to do both at the same time ;)
Oracle /may/ be doing something similar with their java stored
procedures, as they claim these to be "compiled".
-----------------
Hannu
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