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Allocate all entries in the serializable xid hash up-front, so that you don't

run out of shared memory when you try to assign an xid to a transaction.Kevin Grittner

1 parent2ad0348 commitcecb590Copy full SHA for cecb590

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src/backend/storage/lmgr
- predicate.c

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`‎src/backend/storage/lmgr/predicate.c‎`

Lines changed: 3 additions & 5 deletions

Original file line number	Diff line number	Diff line change
`@@ -1018,7 +1018,6 @@ InitPredicateLocks(void)`
`1018`	`1018`	`* PredicateLockShmemSize!`
`1019`	`1019`	`*/`
`1020`	`1020`	`max_table_size= (MaxBackends+max_prepared_xacts);`
`1021`		`-init_table_size=max_table_size /2;`
`1022`	`1021`
`1023`	`1022`	`/*`
`1024`	`1023`	`* Allocate a list to hold information on transactions participating in`
`@@ -1029,7 +1028,6 @@ InitPredicateLocks(void)`
`1029`	`1028`	`* be summarized for storage in SLRU and the "dummy" transaction.`
`1030`	`1029`	`*/`
`1031`	`1030`	`max_table_size *=10;`
`1032`		`-init_table_size *=10;`
`1033`	`1031`
`1034`	`1032`	`PredXact=ShmemInitStruct("PredXactList",`
`1035`	`1033`	`PredXactListDataSize,`
`@@ -1092,7 +1090,7 @@ InitPredicateLocks(void)`
`1092`	`1090`	`hash_flags= (HASH_ELEM \|HASH_FUNCTION);`
`1093`	`1091`
`1094`	`1092`	`SerializableXidHash=ShmemInitHash("SERIALIZABLEXID hash",`
`1095`		`-init_table_size,`
	`1093`	`+max_table_size,`
`1096`	`1094`	`max_table_size,`
`1097`	`1095`	`&info,`
`1098`	`1096`	`hash_flags);`
`@@ -1595,10 +1593,10 @@ RegisterPredicateLockingXid(const TransactionId xid)`
`1595`	`1593`	`&sxidtag,`
`1596`	`1594`	`HASH_ENTER,&found);`
`1597`	`1595`	`if (!sxid)`
	`1596`	`+/* This should not be possible, based on allocation. */`
`1598`	`1597`	`ereport(ERROR,`
`1599`	`1598`	`(errcode(ERRCODE_OUT_OF_MEMORY),`
`1600`		`-errmsg("out of shared memory"),`
`1601`		`-errhint("You might need to increase max_predicate_locks_per_transaction.")));`
	`1599`	`+errmsg("out of shared memory")));`
`1602`	`1600`
`1603`	`1601`	`Assert(!found);`
`1604`	`1602`

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`‎src/backend/storage/lmgr/predicate.c‎`

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