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d2169c9985
It has been incorrectly assumed in commit 7f13ac8123 that we can either
purge all or none in the catalog modifying xids list retrieved from a
serialized snapshot. It is quite possible that some of the xids in that
array are old enough to be pruned but not others.
As per buildfarm
Author: Amit Kapila and Masahiko Sawada
Reviwed-by: Masahiko Sawada
Discussion: https://postgr.es/m/CAA4eK1LBtv6ayE+TvCcPmC-xse=DVg=SmbyQD1nv_AaqcpUJEg@mail.gmail.com
60 lines
2.9 KiB
Ruby
60 lines
2.9 KiB
Ruby
# Test decoding only the commit record of the transaction that have
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# modified catalogs.
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setup
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{
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DROP TABLE IF EXISTS tbl1;
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DROP TABLE IF EXISTS tbl2;
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CREATE TABLE tbl1 (val1 integer, val2 integer);
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CREATE TABLE tbl2 (val1 integer, val2 integer);
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}
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teardown
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{
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DROP TABLE tbl1;
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DROP TABLE tbl2;
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SELECT 'stop' FROM pg_drop_replication_slot('isolation_slot');
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}
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session "s0"
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setup { SET synchronous_commit=on; }
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step "s0_init" { SELECT 'init' FROM pg_create_logical_replication_slot('isolation_slot', 'test_decoding'); }
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step "s0_begin" { BEGIN; }
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step "s0_savepoint" { SAVEPOINT sp1; }
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step "s0_truncate" { TRUNCATE tbl1; }
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step "s0_insert" { INSERT INTO tbl1 VALUES (1); }
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step "s0_commit" { COMMIT; }
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session "s1"
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setup { SET synchronous_commit=on; }
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step "s1_checkpoint" { CHECKPOINT; }
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step "s1_get_changes" { SELECT data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'skip-empty-xacts', '1', 'include-xids', '0'); }
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session "s2"
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setup { SET synchronous_commit=on; }
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step "s2_begin" { BEGIN; }
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step "s2_truncate" { TRUNCATE tbl2; }
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step "s2_commit" { COMMIT; }
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# For the transaction that TRUNCATEd the table tbl1, the last decoding decodes
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# only its COMMIT record, because it starts from the RUNNING_XACTS record emitted
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# during the first checkpoint execution. This transaction must be marked as
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# containing catalog changes while decoding the COMMIT record and the decoding
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# of the INSERT record must read the pg_class with the correct historic snapshot.
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#
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# Note that in a case where bgwriter wrote the RUNNING_XACTS record between "s0_commit"
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# and "s0_begin", this doesn't happen as the decoding starts from the RUNNING_XACTS
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# record written by bgwriter. One might think we can either stop the bgwriter or
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# increase LOG_SNAPSHOT_INTERVAL_MS but it's not practical via tests.
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permutation "s0_init" "s0_begin" "s0_savepoint" "s0_truncate" "s1_checkpoint" "s1_get_changes" "s0_commit" "s0_begin" "s0_insert" "s1_checkpoint" "s1_get_changes" "s0_commit" "s1_get_changes"
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# Test that we can purge the old catalog modifying transactions after restoring
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# them from the serialized snapshot. The first checkpoint will serialize the list
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# of two catalog modifying xacts. The purpose of the second checkpoint is to allow
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# partial pruning of the list of catalog modifying xact. The third checkpoint
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# followed by get_changes establishes a restart_point at the first checkpoint LSN.
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# The last get_changes will start decoding from the first checkpoint which
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# restores the list of catalog modifying xacts and then while decoding the second
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# checkpoint record it prunes one of the xacts in that list and when decoding the
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# next checkpoint, it will completely prune that list.
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permutation "s0_init" "s0_begin" "s0_truncate" "s2_begin" "s2_truncate" "s1_checkpoint" "s1_get_changes" "s0_commit" "s0_begin" "s0_insert" "s1_checkpoint" "s1_get_changes" "s2_commit" "s1_checkpoint" "s1_get_changes" "s0_commit" "s1_get_changes"
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