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Merge pull request #5828 from citusdata/marcocitus/fix-lock

pull/5824/head
Marco Slot 2022-03-18 14:46:38 +01:00 committed by GitHub
parent eeafa67bea cab243218d
commit a1108d2a20
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 18 additions and 3 deletions
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9
src/backend/distributed/worker/worker_shard_visibility.c
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@ -202,12 +202,15 @@ RelationIsAKnownShard(Oid shardRelationId)
}
}
Relation relation = try_relation_open(shardRelationId, AccessShareLock);
if (relation == NULL)
/*
* We do not take locks here, because that might block a query on pg_class.
*/
if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(shardRelationId)))
{
/* relation does not exist */
return false;
}
relation_close(relation, NoLock);
/*
* If the input relation is an index we simply replace the

5
src/test/regress/expected/multi_mx_hide_shard_names.out
View File

@ -71,6 +71,10 @@ SELECT * FROM citus_shard_indexes_on_worker WHERE "Schema" = 'mx_hide_shard_name
---------------------------------------------------------------------
(0 rows)
-- make sure that pg_class queries do not get blocked on table locks
begin;
lock table test_table in access exclusive mode;
prepare transaction 'take-aggressive-lock';
-- shards are hidden when using psql as application_name
SELECT relname FROM pg_catalog.pg_class WHERE relnamespace = 'mx_hide_shard_names'::regnamespace ORDER BY relname;
relname
@ -78,6 +82,7 @@ SELECT relname FROM pg_catalog.pg_class WHERE relnamespace = 'mx_hide_shard_name
test_table
(1 row)
commit prepared 'take-aggressive-lock';
-- now create an index
\c - - - :master_port
SET search_path TO 'mx_hide_shard_names';

7
src/test/regress/sql/multi_mx_hide_shard_names.sql
View File

@ -41,9 +41,16 @@ SET search_path TO 'mx_hide_shard_names';
SELECT * FROM citus_shards_on_worker WHERE "Schema" = 'mx_hide_shard_names' ORDER BY 2;
SELECT * FROM citus_shard_indexes_on_worker WHERE "Schema" = 'mx_hide_shard_names' ORDER BY 2;
-- make sure that pg_class queries do not get blocked on table locks
begin;
lock table test_table in access exclusive mode;
prepare transaction 'take-aggressive-lock';
-- shards are hidden when using psql as application_name
SELECT relname FROM pg_catalog.pg_class WHERE relnamespace = 'mx_hide_shard_names'::regnamespace ORDER BY relname;
commit prepared 'take-aggressive-lock';
-- now create an index
\c - - - :master_port
SET search_path TO 'mx_hide_shard_names';