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Test decoding of two-phase transactions during the build of a consistent snapshot.

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Commit a271a1b50e added the capability to allow decoding at prepare time.
This adds an isolation testcase to test that decoding happens at commit
time when the consistent snapshot state is reached after prepare but
before commit prepared.

Author: Ajin Cherian
Reviewed-by: Amit Kapila
Discussion:
https://postgr.es/m/02DA5F5E-CECE-4D9C-8B4B-418077E2C010@postgrespro.ru
https://postgr.es/m/CAMGcDxeqEpWj3fTXwqhSwBdXd2RS9jzwWscO-XbeCfso6ts3+Q@mail.gmail.com
This commit is contained in:
Amit Kapila 2021-01-05 15:05:22 +05:30
parent 854434c50a
commit 5a3574d7b3
3 changed files with 96 additions and 1 deletions
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3
contrib/test_decoding/Makefile
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@ -7,7 +7,8 @@ REGRESS = ddl xact rewrite toast permissions decoding_in_xact \
decoding_into_rel binary prepared replorigin time messages \
spill slot truncate stream stats twophase twophase_stream
ISOLATION = mxact delayed_startup ondisk_startup concurrent_ddl_dml \
oldest_xmin snapshot_transfer subxact_without_top concurrent_stream
oldest_xmin snapshot_transfer subxact_without_top concurrent_stream \
twophase_snapshot
REGRESS_OPTS = --temp-config $(top_srcdir)/contrib/test_decoding/logical.conf
ISOLATION_OPTS = --temp-config $(top_srcdir)/contrib/test_decoding/logical.conf

41
contrib/test_decoding/expected/twophase_snapshot.out Normal file
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@ -0,0 +1,41 @@
Parsed test spec with 3 sessions
starting permutation: s2b s2txid s1init s3b s3txid s2c s2b s2insert s2p s3c s1insert s1start s2cp s1start
step s2b: BEGIN;
step s2txid: SELECT pg_current_xact_id() IS NULL;
?column?
f
step s1init: SELECT 'init' FROM pg_create_logical_replication_slot('isolation_slot', 'test_decoding'); <waiting ...>
step s3b: BEGIN;
step s3txid: SELECT pg_current_xact_id() IS NULL;
?column?
f
step s2c: COMMIT;
step s2b: BEGIN;
step s2insert: INSERT INTO do_write DEFAULT VALUES;
step s2p: PREPARE TRANSACTION 'test1';
step s3c: COMMIT;
step s1init: <... completed>
?column?
init
step s1insert: INSERT INTO do_write DEFAULT VALUES;
step s1start: SELECT data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', 'false', 'two-phase-commit', '1');
data
BEGIN
table public.do_write: INSERT: id[integer]:2
COMMIT
step s2cp: COMMIT PREPARED 'test1';
step s1start: SELECT data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', 'false', 'two-phase-commit', '1');
data
BEGIN
table public.do_write: INSERT: id[integer]:1
PREPARE TRANSACTION 'test1'
COMMIT PREPARED 'test1'
?column?
stop

53
contrib/test_decoding/specs/twophase_snapshot.spec Normal file
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@ -0,0 +1,53 @@
# Test decoding of two-phase transactions during the build of a consistent snapshot.
setup
{
DROP TABLE IF EXISTS do_write;
CREATE TABLE do_write(id serial primary key);
}
teardown
{
DROP TABLE do_write;
SELECT 'stop' FROM pg_drop_replication_slot('isolation_slot');
}
session "s1"
setup { SET synchronous_commit=on; }
step "s1init" {SELECT 'init' FROM pg_create_logical_replication_slot('isolation_slot', 'test_decoding');}
step "s1start" {SELECT data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', 'false', 'two-phase-commit', '1');}
step "s1insert" { INSERT INTO do_write DEFAULT VALUES; }
session "s2"
setup { SET synchronous_commit=on; }
step "s2b" { BEGIN; }
step "s2txid" { SELECT pg_current_xact_id() IS NULL; }
step "s2c" { COMMIT; }
step "s2insert" { INSERT INTO do_write DEFAULT VALUES; }
step "s2p" { PREPARE TRANSACTION 'test1'; }
step "s2cp" { COMMIT PREPARED 'test1'; }
session "s3"
setup { SET synchronous_commit=on; }
step "s3b" { BEGIN; }
step "s3txid" { SELECT pg_current_xact_id() IS NULL; }
step "s3c" { COMMIT; }
# Force building of a consistent snapshot between a PREPARE and COMMIT PREPARED
# and ensure that the whole transaction is decoded at the time of COMMIT
# PREPARED.
#
# 's1init' step will initialize the replication slot and cause logical decoding
# to wait in initial starting point till the in-progress transaction in s2 is
# committed. 's2c' step will cause logical decoding to go to initial consistent
# point and wait for in-progress transaction s3 to commit. 's3c' step will cause
# logical decoding to find a consistent point while the transaction s2 is
# prepared and not yet committed. This will cause the first s1start to skip
# prepared transaction s2 as that will be before consistent point. The second
# s1start will allow decoding of skipped prepare along with commit prepared done
# as part of s2cp.
permutation "s2b" "s2txid" "s1init" "s3b" "s3txid" "s2c" "s2b" "s2insert" "s2p" "s3c" "s1insert" "s1start" "s2cp" "s1start"