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Commit8d1fbf9

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Unbreak lock conflict detection for Hot Standby.
This got broken in the original fast-path locking patch, becauseI failed to account for the fact that Hot Standby startup processmight take a strong relation lock on a relation in a database towhich it is not bound, and confused MyDatabaseId with the databaseID of the relation being locked.Report and diagnosis by Andres Freund. Final form of patch by me.
1 parent71c53d5 commit8d1fbf9

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  • src/backend/storage/lmgr

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‎src/backend/storage/lmgr/lock.c

Lines changed: 6 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -2296,8 +2296,8 @@ FastPathTransferRelationLocks(LockMethod lockMethodTable, const LOCKTAG *locktag
22962296
LWLockAcquire(proc->backendLock,LW_EXCLUSIVE);
22972297

22982298
/*
2299-
* If the target backend isn't referencing the same database aswe
2300-
*are, then we needn't examine the individual relation IDs at all;
2299+
* If the target backend isn't referencing the same database asthe
2300+
*lock, then we needn't examine the individual relation IDs at all;
23012301
* none of them can be relevant.
23022302
*
23032303
* proc->databaseId is set at backend startup time and never changes
@@ -2310,7 +2310,7 @@ FastPathTransferRelationLocks(LockMethod lockMethodTable, const LOCKTAG *locktag
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* fencing operation since the other backend set proc->databaseId.So
23112311
* for now, we test it after acquiring the LWLock just to be safe.
23122312
*/
2313-
if (proc->databaseId!=MyDatabaseId)
2313+
if (proc->databaseId!=locktag->locktag_field1)
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{
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LWLockRelease(proc->backendLock);
23162316
continue;
@@ -2528,14 +2528,14 @@ GetLockConflicts(const LOCKTAG *locktag, LOCKMODE lockmode)
25282528
LWLockAcquire(proc->backendLock,LW_SHARED);
25292529

25302530
/*
2531-
* If the target backend isn't referencing the same database aswe
2532-
*are, then we needn't examine the individual relation IDs at
2531+
* If the target backend isn't referencing the same database asthe
2532+
*lock, then we needn't examine the individual relation IDs at
25332533
* all; none of them can be relevant.
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*
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* See FastPathTransferLocks() for discussion of why we do this
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* test after acquiring the lock.
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*/
2538-
if (proc->databaseId!=MyDatabaseId)
2538+
if (proc->databaseId!=locktag->locktag_field1)
25392539
{
25402540
LWLockRelease(proc->backendLock);
25412541
continue;

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