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Commit809c9b4

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Run catalog reindexing test from3dbb317 serially, to avoid deadlocks.
The tests turn out to cause deadlocks in some circumstances. Fairlyreproducibly so with -DRELCACHE_FORCE_RELEASE-DCATCACHE_FORCE_RELEASE. Some of the deadlocks may be hard to fixwithout disproportionate measures, but others probably should be fixed- but not in 12.We discussed removing the new tests until we can fix the issuesunderlying the deadlocks, but results from buildfarm animalmarkhor (which runs with CLOBBER_CACHE_ALWAYS) indicates that theremight be a more severe, as of yet undiagnosed, issue (including onstable branches) with reindexing catalogs. The failure is:ERROR: could not read block 0 in file "base/16384/28025": read only 0 of 8192 bytesTherefore it seems advisable to keep the tests.It's not certain that running the tests in isolation removes the riskof deadlocks. It's possible that additional locks are needed toprotect against a concurrent auto-analyze or such.Per discussion with Tom Lane.Discussion:https://postgr.es/m/28926.1556664156@sss.pgh.pa.usBackpatch: 9.4-, like3dbb317
1 parent4b40d40 commit809c9b4

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6 files changed

+75
-39
lines changed

6 files changed

+75
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lines changed

‎src/test/regress/expected/create_index.out

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Original file line numberDiff line numberDiff line change
@@ -1939,24 +1939,6 @@ INFO: index "reindex_verbose_pkey" was reindexed
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\set VERBOSITY default
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DROP TABLE reindex_verbose;
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--
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-- check that system tables can be reindexed
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--
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-- whole tables
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REINDEX TABLE pg_class; -- mapped, non-shared, critical
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REINDEX TABLE pg_index; -- non-mapped, non-shared, critical
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REINDEX TABLE pg_operator; -- non-mapped, non-shared, critical
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REINDEX TABLE pg_database; -- mapped, shared, critical
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REINDEX TABLE pg_shdescription; -- mapped, shared non-critical
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-- Check that individual system indexes can be reindexed. That's a bit
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-- different from the entire-table case because reindex_relation
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-- treats e.g. pg_class special.
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REINDEX INDEX pg_class_oid_index; -- mapped, non-shared, critical
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REINDEX INDEX pg_class_relname_nsp_index; -- mapped, non-shared, non-critical
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REINDEX INDEX pg_index_indexrelid_index; -- non-mapped, non-shared, critical
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REINDEX INDEX pg_index_indrelid_index; -- non-mapped, non-shared, non-critical
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REINDEX INDEX pg_database_oid_index; -- mapped, shared, critical
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REINDEX INDEX pg_shdescription_o_c_index; -- mapped, shared, non-critical
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--
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-- REINDEX CONCURRENTLY
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--
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CREATE TABLE concur_reindex_tab (c1 int);
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--
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-- Check that system tables can be reindexed.
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--
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-- Note that this test currently has to run without parallel tests
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-- being scheduled, as currently reindex catalog tables can cause
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-- deadlocks:
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--
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-- * The lock upgrade between the ShareLock acquired for the reindex
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-- and RowExclusiveLock needed for pg_class/pg_index locks can
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-- trigger deadlocks.
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--
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-- * The uniqueness checks performed when reindexing a unique/primary
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-- key index possibly need to wait for the transaction of a
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-- about-to-deleted row in pg_class to commit. That can cause
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-- deadlocks because, in contrast to user tables, locks on catalog
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-- tables are routinely released before commit - therefore the lock
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-- held for reindexing doesn't guarantee that no running transaction
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-- performed modifications in the table underlying the index.
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-- Check reindexing of whole tables
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REINDEX TABLE pg_class; -- mapped, non-shared, critical
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REINDEX TABLE pg_index; -- non-mapped, non-shared, critical
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REINDEX TABLE pg_operator; -- non-mapped, non-shared, critical
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REINDEX TABLE pg_database; -- mapped, shared, critical
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REINDEX TABLE pg_shdescription; -- mapped, shared non-critical
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-- Check that individual system indexes can be reindexed. That's a bit
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-- different from the entire-table case because reindex_relation
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-- treats e.g. pg_class special.
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REINDEX INDEX pg_class_oid_index; -- mapped, non-shared, critical
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REINDEX INDEX pg_class_relname_nsp_index; -- mapped, non-shared, non-critical
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REINDEX INDEX pg_index_indexrelid_index; -- non-mapped, non-shared, critical
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REINDEX INDEX pg_index_indrelid_index; -- non-mapped, non-shared, non-critical
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REINDEX INDEX pg_database_oid_index; -- mapped, shared, critical
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REINDEX INDEX pg_shdescription_o_c_index; -- mapped, shared, non-critical

‎src/test/regress/parallel_schedule

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@@ -52,6 +52,11 @@ test: create_misc create_operator create_procedure
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# These depend on create_misc and create_operator
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test: create_index create_index_spgist create_view index_including index_including_gist
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# ----------
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# Has to run in isolation, due to deadlock risk
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# ----------
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test: reindex_catalog
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# ----------
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# Another group of parallel tests
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# ----------

‎src/test/regress/serial_schedule

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@@ -67,6 +67,7 @@ test: create_index_spgist
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test: create_view
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test: index_including
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test: index_including_gist
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test: reindex_catalog
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test: create_aggregate
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test: create_function_3
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test: create_cast

‎src/test/regress/sql/create_index.sql

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Original file line numberDiff line numberDiff line change
@@ -747,27 +747,6 @@ REINDEX (VERBOSE) TABLE reindex_verbose;
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\set VERBOSITY default
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DROPTABLE reindex_verbose;
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--
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-- check that system tables can be reindexed
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--
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-- whole tables
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REINDEX TABLE pg_class;-- mapped, non-shared, critical
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REINDEX TABLE pg_index;-- non-mapped, non-shared, critical
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REINDEX TABLE pg_operator;-- non-mapped, non-shared, critical
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REINDEX TABLE pg_database;-- mapped, shared, critical
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REINDEX TABLE pg_shdescription;-- mapped, shared non-critical
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-- Check that individual system indexes can be reindexed. That's a bit
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-- different from the entire-table case because reindex_relation
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-- treats e.g. pg_class special.
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REINDEX INDEX pg_class_oid_index;-- mapped, non-shared, critical
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REINDEX INDEX pg_class_relname_nsp_index;-- mapped, non-shared, non-critical
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REINDEX INDEX pg_index_indexrelid_index;-- non-mapped, non-shared, critical
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REINDEX INDEX pg_index_indrelid_index;-- non-mapped, non-shared, non-critical
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REINDEX INDEX pg_database_oid_index;-- mapped, shared, critical
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REINDEX INDEX pg_shdescription_o_c_index;-- mapped, shared, non-critical
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--
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-- REINDEX CONCURRENTLY
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--
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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,36 @@
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--
2+
-- Check that system tables can be reindexed.
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--
4+
-- Note that this test currently has to run without parallel tests
5+
-- being scheduled, as currently reindex catalog tables can cause
6+
-- deadlocks:
7+
--
8+
-- * The lock upgrade between the ShareLock acquired for the reindex
9+
-- and RowExclusiveLock needed for pg_class/pg_index locks can
10+
-- trigger deadlocks.
11+
--
12+
-- * The uniqueness checks performed when reindexing a unique/primary
13+
-- key index possibly need to wait for the transaction of a
14+
-- about-to-deleted row in pg_class to commit. That can cause
15+
-- deadlocks because, in contrast to user tables, locks on catalog
16+
-- tables are routinely released before commit - therefore the lock
17+
-- held for reindexing doesn't guarantee that no running transaction
18+
-- performed modifications in the table underlying the index.
19+
20+
21+
-- Check reindexing of whole tables
22+
REINDEX TABLE pg_class;-- mapped, non-shared, critical
23+
REINDEX TABLE pg_index;-- non-mapped, non-shared, critical
24+
REINDEX TABLE pg_operator;-- non-mapped, non-shared, critical
25+
REINDEX TABLE pg_database;-- mapped, shared, critical
26+
REINDEX TABLE pg_shdescription;-- mapped, shared non-critical
27+
28+
-- Check that individual system indexes can be reindexed. That's a bit
29+
-- different from the entire-table case because reindex_relation
30+
-- treats e.g. pg_class special.
31+
REINDEX INDEX pg_class_oid_index;-- mapped, non-shared, critical
32+
REINDEX INDEX pg_class_relname_nsp_index;-- mapped, non-shared, non-critical
33+
REINDEX INDEX pg_index_indexrelid_index;-- non-mapped, non-shared, critical
34+
REINDEX INDEX pg_index_indrelid_index;-- non-mapped, non-shared, non-critical
35+
REINDEX INDEX pg_database_oid_index;-- mapped, shared, critical
36+
REINDEX INDEX pg_shdescription_o_c_index;-- mapped, shared, non-critical

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