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Postgres FD Implementation
Commit eb43bdbf authored by Alvaro Herrera's avatar Alvaro Herrera
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Make detach-partition-concurrently-4 less timing sensitive 

Same as 5e0b1aeb, for the companion test file.

This one seems lower probability (only two failures in a month of runs);
I was hardly able to reproduce a failure without a patch, so the fact
that I was also unable to reproduce one with it doesn't say anything.
We'll have to wait for further buildfarm results to see if we need any
further adjustments.

Discussion: https://postgr.es/m/20210524090712.GA3771394@rfd.leadboat.com
parent e30e3fde
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src/test/isolation/expected/detach-partition-concurrently-4.out
View file @ eb43bdbf
Parsed test spec with 3 sessions
starting permutation: s2snitch s1b s1s s2detach s1cancel s1insert s1c
starting permutation: s2snitch s1b s1s s2detach s1cancel s2noop s1insert s1c
step s2snitch: insert into d4_pid select pg_backend_pid();
step s1b: begin;
step s1s: select * from d4_primary;
......@@ -9,12 +9,13 @@ a
1
2
step s2detach: alter table d4_primary detach partition d4_primary1 concurrently; <waiting ...>
step s1cancel: select pg_cancel_backend(pid) from d4_pid;
pg_cancel_backend
step s1cancel: select pg_cancel_backend(pid), pg_sleep(0.1) from d4_pid;
pg_cancel_backendpg_sleep
t
t
step s2detach: <... completed>
error in steps s1cancel s2detach: ERROR: canceling statement due to user request
step s2noop: UNLISTEN noop;
step s1insert: insert into d4_fk values (1);
ERROR: insert or update on table "d4_fk" violates foreign key constraint "d4_fk_a_fkey"
step s1c: commit;
......@@ -33,7 +34,7 @@ step s2detach: <... completed>
error in steps s1insert s2detach: ERROR: insert or update on table "d4_fk" violates foreign key constraint "d4_fk_a_fkey"
step s1c: commit;
starting permutation: s2snitch s1brr s1s s2detach s1cancel s1insert s1c
starting permutation: s2snitch s1brr s1s s2detach s1cancel s2noop s1insert s1c
step s2snitch: insert into d4_pid select pg_backend_pid();
step s1brr: begin isolation level repeatable read;
step s1s: select * from d4_primary;
......@@ -42,12 +43,13 @@ a
1
2
step s2detach: alter table d4_primary detach partition d4_primary1 concurrently; <waiting ...>
step s1cancel: select pg_cancel_backend(pid) from d4_pid;
pg_cancel_backend
step s1cancel: select pg_cancel_backend(pid), pg_sleep(0.1) from d4_pid;
pg_cancel_backendpg_sleep
t
t
step s2detach: <... completed>
error in steps s1cancel s2detach: ERROR: canceling statement due to user request
step s2noop: UNLISTEN noop;
step s1insert: insert into d4_fk values (1);
ERROR: insert or update on table "d4_fk" violates foreign key constraint "d4_fk_a_fkey"
step s1c: commit;
......@@ -66,17 +68,18 @@ step s2detach: <... completed>
error in steps s1insert s2detach: ERROR: insert or update on table "d4_fk" violates foreign key constraint "d4_fk_a_fkey"
step s1c: commit;
starting permutation: s2snitch s1b s1declare s2detach s1cancel s1fetchall s1insert s1c
starting permutation: s2snitch s1b s1declare s2detach s1cancel s2noop s1fetchall s1insert s1c
step s2snitch: insert into d4_pid select pg_backend_pid();
step s1b: begin;
step s1declare: declare f cursor for select * from d4_primary;
step s2detach: alter table d4_primary detach partition d4_primary1 concurrently; <waiting ...>
step s1cancel: select pg_cancel_backend(pid) from d4_pid;
pg_cancel_backend
step s1cancel: select pg_cancel_backend(pid), pg_sleep(0.1) from d4_pid;
pg_cancel_backendpg_sleep
t
t
step s2detach: <... completed>
error in steps s1cancel s2detach: ERROR: canceling statement due to user request
step s2noop: UNLISTEN noop;
step s1fetchall: fetch all from f;
a
......@@ -101,17 +104,18 @@ step s2detach: <... completed>
error in steps s1insert s2detach: ERROR: insert or update on table "d4_fk" violates foreign key constraint "d4_fk_a_fkey"
step s1c: commit;
starting permutation: s2snitch s1b s1declare s2detach s1cancel s1svpt s1insert s1rollback s1fetchall s1c
starting permutation: s2snitch s1b s1declare s2detach s1cancel s2noop s1svpt s1insert s1rollback s1fetchall s1c
step s2snitch: insert into d4_pid select pg_backend_pid();
step s1b: begin;
step s1declare: declare f cursor for select * from d4_primary;
step s2detach: alter table d4_primary detach partition d4_primary1 concurrently; <waiting ...>
step s1cancel: select pg_cancel_backend(pid) from d4_pid;
pg_cancel_backend
step s1cancel: select pg_cancel_backend(pid), pg_sleep(0.1) from d4_pid;
pg_cancel_backendpg_sleep
t
t
step s2detach: <... completed>
error in steps s1cancel s2detach: ERROR: canceling statement due to user request
step s2noop: UNLISTEN noop;
step s1svpt: savepoint f;
step s1insert: insert into d4_fk values (1);
ERROR: insert or update on table "d4_fk" violates foreign key constraint "d4_fk_a_fkey"
......@@ -140,15 +144,16 @@ a
step s1c: commit;
step s2detach: <... completed>
starting permutation: s2snitch s1b s2detach s1declare s1cancel s1fetchall s1insert s1c
starting permutation: s2snitch s1b s2detach s1declare s1cancel s2noop s1fetchall s1insert s1c
step s2snitch: insert into d4_pid select pg_backend_pid();
step s1b: begin;
step s2detach: alter table d4_primary detach partition d4_primary1 concurrently;
step s1declare: declare f cursor for select * from d4_primary;
step s1cancel: select pg_cancel_backend(pid) from d4_pid;
pg_cancel_backend
step s1cancel: select pg_cancel_backend(pid), pg_sleep(0.1) from d4_pid;
pg_cancel_backendpg_sleep
t
t
step s2noop: UNLISTEN noop;
step s1fetchall: fetch all from f;
a
......@@ -170,15 +175,16 @@ step s1insert: insert into d4_fk values (1);
ERROR: insert or update on table "d4_fk" violates foreign key constraint "d4_fk_a_fkey"
step s1c: commit;
starting permutation: s2snitch s1b s2detach s1declare s1cancel s1svpt s1insert s1rollback s1fetchall s1c
starting permutation: s2snitch s1b s2detach s1declare s1cancel s2noop s1svpt s1insert s1rollback s1fetchall s1c
step s2snitch: insert into d4_pid select pg_backend_pid();
step s1b: begin;
step s2detach: alter table d4_primary detach partition d4_primary1 concurrently;
step s1declare: declare f cursor for select * from d4_primary;
step s1cancel: select pg_cancel_backend(pid) from d4_pid;
pg_cancel_backend
step s1cancel: select pg_cancel_backend(pid), pg_sleep(0.1) from d4_pid;
pg_cancel_backendpg_sleep
t
t
step s2noop: UNLISTEN noop;
step s1svpt: savepoint f;
step s1insert: insert into d4_fk values (1);
ERROR: insert or update on table "d4_fk" violates foreign key constraint "d4_fk_a_fkey"
......@@ -204,7 +210,7 @@ a
2
step s1c: commit;
starting permutation: s2snitch s1brr s1declare2 s1fetchone s2detach s1cancel s1updcur s1c
starting permutation: s2snitch s1brr s1declare2 s1fetchone s2detach s1cancel s2noop s1updcur s1c
step s2snitch: insert into d4_pid select pg_backend_pid();
step s1brr: begin isolation level repeatable read;
step s1declare2: declare f cursor for select * from d4_fk where a = 2;
......@@ -213,12 +219,13 @@ a
2
step s2detach: alter table d4_primary detach partition d4_primary1 concurrently; <waiting ...>
step s1cancel: select pg_cancel_backend(pid) from d4_pid;
pg_cancel_backend
step s1cancel: select pg_cancel_backend(pid), pg_sleep(0.1) from d4_pid;
pg_cancel_backendpg_sleep
t
t
step s2detach: <... completed>
error in steps s1cancel s2detach: ERROR: canceling statement due to user request
step s2noop: UNLISTEN noop;
step s1updcur: update d4_fk set a = 1 where current of f;
ERROR: insert or update on table "d4_fk" violates foreign key constraint "d4_fk_a_fkey"
step s1c: commit;
......@@ -265,7 +272,7 @@ ERROR: insert or update on table "d4_fk" violates foreign key constraint "d4_fk
step s1c: commit;
step s2detach: <... completed>
starting permutation: s2snitch s1b s1s s2detach s3brr s3insert s3commit s1cancel s1c
starting permutation: s2snitch s1b s1s s2detach s3brr s3insert s3commit s1cancel s2noop s1c
step s2snitch: insert into d4_pid select pg_backend_pid();
step s1b: begin;
step s1s: select * from d4_primary;
......@@ -278,12 +285,13 @@ step s3brr: begin isolation level repeatable read;
step s3insert: insert into d4_fk values (1);
ERROR: insert or update on table "d4_fk" violates foreign key constraint "d4_fk_a_fkey"
step s3commit: commit;
step s1cancel: select pg_cancel_backend(pid) from d4_pid;
pg_cancel_backend
step s1cancel: select pg_cancel_backend(pid), pg_sleep(0.1) from d4_pid;
pg_cancel_backendpg_sleep
t
t
step s2detach: <... completed>
error in steps s1cancel s2detach: ERROR: canceling statement due to user request
step s2noop: UNLISTEN noop;
step s1c: commit;
starting permutation: s2snitch s1b s1s s2detach s3brr s3insert s3commit s1c
......@@ -302,7 +310,7 @@ step s3commit: commit;
step s1c: commit;
step s2detach: <... completed>
starting permutation: s2snitch s1brr s1s s2detach s1cancel s3vacfreeze s1s s1insert s1c
starting permutation: s2snitch s1brr s1s s2detach s1cancel s2noop s3vacfreeze s1s s1insert s1c
step s2snitch: insert into d4_pid select pg_backend_pid();
step s1brr: begin isolation level repeatable read;
step s1s: select * from d4_primary;
......@@ -311,12 +319,13 @@ a
1
2
step s2detach: alter table d4_primary detach partition d4_primary1 concurrently; <waiting ...>
step s1cancel: select pg_cancel_backend(pid) from d4_pid;
pg_cancel_backend
step s1cancel: select pg_cancel_backend(pid), pg_sleep(0.1) from d4_pid;
pg_cancel_backendpg_sleep
t
t
step s2detach: <... completed>
error in steps s1cancel s2detach: ERROR: canceling statement due to user request
step s2noop: UNLISTEN noop;
step s3vacfreeze: vacuum freeze pg_catalog.pg_inherits;
step s1s: select * from d4_primary;
a
......@@ -327,7 +336,7 @@ step s1insert: insert into d4_fk values (1);
ERROR: insert or update on table "d4_fk" violates foreign key constraint "d4_fk_a_fkey"
step s1c: commit;
starting permutation: s2snitch s1b s1s s2detach s1cancel s3vacfreeze s1s s1insert s1c
starting permutation: s2snitch s1b s1s s2detach s1cancel s2noop s3vacfreeze s1s s1insert s1c
step s2snitch: insert into d4_pid select pg_backend_pid();
step s1b: begin;
step s1s: select * from d4_primary;
......@@ -336,12 +345,13 @@ a
1
2
step s2detach: alter table d4_primary detach partition d4_primary1 concurrently; <waiting ...>
step s1cancel: select pg_cancel_backend(pid) from d4_pid;
pg_cancel_backend
step s1cancel: select pg_cancel_backend(pid), pg_sleep(0.1) from d4_pid;
pg_cancel_backendpg_sleep
t
t
step s2detach: <... completed>
error in steps s1cancel s2detach: ERROR: canceling statement due to user request
step s2noop: UNLISTEN noop;
step s3vacfreeze: vacuum freeze pg_catalog.pg_inherits;
step s1s: select * from d4_primary;
a
......
src/test/isolation/specs/detach-partition-concurrently-4.spec
View file @ eb43bdbf
......@@ -3,6 +3,11 @@
# (The cases where the detaching transaction is cancelled is interesting
# because the locking situation is completely different. I didn't verify
# that keeping both variants adds any extra coverage.)
#
# Note: Always keep "s2noop" right after "s1cancel" in permutations. This
# reduces the probability of the timing problem that the cancel error report
# is shown together with the next query instead of with the cancel query.
setup {
drop table if exists d4_primary, d4_primary1, d4_fk, d4_pid;
create table d4_primary (a int primary key) partition by list (a);
......@@ -19,7 +24,8 @@ session "s1"
step "s1b" { begin; }
step "s1brr" { begin isolation level repeatable read; }
step "s1s" { select * from d4_primary; }
step "s1cancel" { select pg_cancel_backend(pid) from d4_pid; }
# Sleep 0.1s after sending cancel, to give s2 time to react
step "s1cancel" { select pg_cancel_backend(pid), pg_sleep(0.1) from d4_pid; }
step "s1insert" { insert into d4_fk values (1); }
step "s1c" { commit; }
step "s1declare" { declare f cursor for select * from d4_primary; }
......@@ -33,6 +39,7 @@ step "s1rollback" { rollback to f; }
session "s2"
step "s2snitch" { insert into d4_pid select pg_backend_pid(); }
step "s2detach" { alter table d4_primary detach partition d4_primary1 concurrently; }
step "s2noop" { UNLISTEN noop; }
session "s3"
step "s3brr" { begin isolation level repeatable read; }
......@@ -41,34 +48,34 @@ step "s3commit" { commit; }
step "s3vacfreeze" { vacuum freeze pg_catalog.pg_inherits; }
# Trying to insert into a partially detached partition is rejected
permutation "s2snitch" "s1b" "s1s" "s2detach" "s1cancel" "s1insert" "s1c"
permutation "s2snitch" "s1b" "s1s" "s2detach" "s1cancel" "s2noop" "s1insert" "s1c"
permutation "s2snitch" "s1b" "s1s" "s2detach" "s1insert" "s1c"
# ... even under REPEATABLE READ mode.
permutation "s2snitch" "s1brr" "s1s" "s2detach" "s1cancel" "s1insert" "s1c"
permutation "s2snitch" "s1brr" "s1s" "s2detach" "s1cancel" "s2noop" "s1insert" "s1c"
permutation "s2snitch" "s1brr" "s1s" "s2detach" "s1insert" "s1c"
# If you read the referenced table using a cursor, you can see a row that the
# RI query does not see.
permutation "s2snitch" "s1b" "s1declare" "s2detach" "s1cancel" "s1fetchall" "s1insert" "s1c"
permutation "s2snitch" "s1b" "s1declare" "s2detach" "s1cancel" "s2noop" "s1fetchall" "s1insert" "s1c"
permutation "s2snitch" "s1b" "s1declare" "s2detach" "s1fetchall" "s1insert" "s1c"
permutation "s2snitch" "s1b" "s1declare" "s2detach" "s1cancel" "s1svpt" "s1insert" "s1rollback" "s1fetchall" "s1c"
permutation "s2snitch" "s1b" "s1declare" "s2detach" "s1cancel" "s2noop" "s1svpt" "s1insert" "s1rollback" "s1fetchall" "s1c"
permutation "s2snitch" "s1b" "s1declare" "s2detach" "s1svpt" "s1insert" "s1rollback" "s1fetchall" "s1c"
permutation "s2snitch" "s1b" "s2detach" "s1declare" "s1cancel" "s1fetchall" "s1insert" "s1c"
permutation "s2snitch" "s1b" "s2detach" "s1declare" "s1cancel" "s2noop" "s1fetchall" "s1insert" "s1c"
permutation "s2snitch" "s1b" "s2detach" "s1declare" "s1fetchall" "s1insert" "s1c"
permutation "s2snitch" "s1b" "s2detach" "s1declare" "s1cancel" "s1svpt" "s1insert" "s1rollback" "s1fetchall" "s1c"
permutation "s2snitch" "s1b" "s2detach" "s1declare" "s1cancel" "s2noop" "s1svpt" "s1insert" "s1rollback" "s1fetchall" "s1c"
permutation "s2snitch" "s1b" "s2detach" "s1declare" "s1svpt" "s1insert" "s1rollback" "s1fetchall" "s1c"
# Creating the referencing row using a cursor
permutation "s2snitch" "s1brr" "s1declare2" "s1fetchone" "s2detach" "s1cancel" "s1updcur" "s1c"
permutation "s2snitch" "s1brr" "s1declare2" "s1fetchone" "s2detach" "s1cancel" "s2noop" "s1updcur" "s1c"
permutation "s2snitch" "s1brr" "s1declare2" "s1fetchone" "s2detach" "s1updcur" "s1c"
permutation "s2snitch" "s1brr" "s1declare2" "s1fetchone" "s1updcur" "s2detach" "s1c"
# Try reading the table from an independent session.
permutation "s2snitch" "s1b" "s1s" "s2detach" "s3insert" "s1c"
permutation "s2snitch" "s1b" "s1s" "s2detach" "s3brr" "s3insert" "s3commit" "s1cancel" "s1c"
permutation "s2snitch" "s1b" "s1s" "s2detach" "s3brr" "s3insert" "s3commit" "s1cancel" "s2noop" "s1c"
permutation "s2snitch" "s1b" "s1s" "s2detach" "s3brr" "s3insert" "s3commit" "s1c"
# Try one where we VACUUM FREEZE pg_inherits (to verify that xmin change is
# handled correctly).
permutation "s2snitch" "s1brr" "s1s" "s2detach" "s1cancel" "s3vacfreeze" "s1s" "s1insert" "s1c"
permutation "s2snitch" "s1b" "s1s" "s2detach" "s1cancel" "s3vacfreeze" "s1s" "s1insert" "s1c"
permutation "s2snitch" "s1brr" "s1s" "s2detach" "s1cancel" "s2noop" "s3vacfreeze" "s1s" "s1insert" "s1c"
permutation "s2snitch" "s1b" "s1s" "s2detach" "s1cancel" "s2noop" "s3vacfreeze" "s1s" "s1insert" "s1c"
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