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Merge pull request #911 from citusdata/bugfix/take_metadata_lock 

Take shard metadata lock in several UDFs
pull/995/head
Marco Slot 2016-12-02 16:34:44 +01:00 committed by GitHub
parent 8013437fc3 172bb457e6
commit ab982c3ecb
1 changed files with 5 additions and 6 deletions
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11
src/backend/distributed/master/master_stage_protocol.c
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@ -226,12 +226,11 @@ master_append_table_to_shard(PG_FUNCTION_ARGS)
"in hash-partitioned tables")));
}
/*
* We lock on the shardId, but do not unlock. When the function returns, and
* the transaction for this function commits, this lock will automatically
* be released. This ensures appends to a shard happen in a serial manner.
*/
LockShardResource(shardId, AccessExclusiveLock);
/* ensure that the shard placement metadata does not change during the append */
LockShardDistributionMetadata(shardId, ShareLock);
/* serialize appends to the same shard */
LockShardResource(shardId, ExclusiveLock);
/* get schame name of the target shard */
shardSchemaOid = get_rel_namespace(relationId);