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Avoid running out of memory during hash_create, by not passing a

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number-of-buckets that exceeds the size we actually plan to allow
the hash table to grow to.  Per trouble report from Sean Shanny.
This commit is contained in:
Tom Lane 2003-12-30 20:05:05 +00:00
parent e8aa10ee47
commit 7af16b2a25
1 changed files with 10 additions and 4 deletions
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14
src/backend/executor/nodeIndexscan.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/executor/nodeIndexscan.c,v 1.87 2003/11/29 19:51:48 pgsql Exp $
* $PostgreSQL: pgsql/src/backend/executor/nodeIndexscan.c,v 1.88 2003/12/30 20:05:05 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -953,22 +953,28 @@ static void
create_duphash(IndexScanState *node)
{
HASHCTL hash_ctl;
long nbuckets;
node->iss_MaxHash = (SortMem * 1024L) /
(MAXALIGN(sizeof(HASHELEMENT)) + MAXALIGN(sizeof(DupHashTabEntry)));
MemSet(&hash_ctl, 0, sizeof(hash_ctl));
hash_ctl.keysize = SizeOfIptrData;
hash_ctl.entrysize = sizeof(DupHashTabEntry);
hash_ctl.hash = tag_hash;
hash_ctl.hcxt = CurrentMemoryContext;
nbuckets = (long) ceil(node->ss.ps.plan->plan_rows);
if (nbuckets < 1)
nbuckets = 1;
if (nbuckets > node->iss_MaxHash)
nbuckets = node->iss_MaxHash;
node->iss_DupHash = hash_create("DupHashTable",
(long) ceil(node->ss.ps.plan->plan_rows),
nbuckets,
&hash_ctl,
HASH_ELEM | HASH_FUNCTION | HASH_CONTEXT);
if (node->iss_DupHash == NULL)
ereport(ERROR,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory")));
node->iss_MaxHash = (SortMem * 1024L) /
(MAXALIGN(sizeof(HASHELEMENT)) + MAXALIGN(sizeof(DupHashTabEntry)));
}
int