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Merge pull request #974 from citusdata/fix/use_access_share_lock 

Use AccessShareLock on the source table while creating a colocated table
pull/979/head
Metin Döşlü 2016-11-10 11:30:55 -08:00 committed by GitHub
parent 6810835e1a a0c92b38cb
commit ce3019d39e
1 changed files with 3 additions and 2 deletions
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5
src/backend/distributed/master/master_create_shards.c
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@ -41,6 +41,7 @@
#include "nodes/primnodes.h"
#include "postmaster/postmaster.h"
#include "storage/fd.h"
#include "storage/lmgr.h"
#include "storage/lock.h"
#include "utils/builtins.h"
#include "utils/elog.h"
@ -247,8 +248,8 @@ CreateColocatedShards(Oid targetRelationId, Oid sourceRelationId)
/* we plan to add shards: get an exclusive metadata lock on the target relation */
LockRelationDistributionMetadata(targetRelationId, ExclusiveLock);
/* a share metadata lock is enough on the source relation */
LockRelationDistributionMetadata(sourceRelationId, ShareLock);
/* we don't want source table to get dropped before we colocate with it */
LockRelationOid(sourceRelationId, AccessShareLock);
/* prevent placement changes of the source relation until we colocate with them */
sourceShardIntervalList = LoadShardIntervalList(sourceRelationId);