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Predicate locking in hash indexes.

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Hash index searches acquire predicate locks on the primary
page of a bucket. It acquires a lock on both the old and new buckets
for scans that happen concurrently with page splits. During a bucket
split, a predicate lock is copied from the primary page of an old
bucket to the primary page of a new bucket.

Author: Shubham Barai, Amit Kapila
Reviewed by: Amit Kapila, Alexander Korotkov, Thomas Munro
Discussion: https://www.postgresql.org/message-id/flat/CALxAEPvNsM2GTiXdRgaaZ1Pjd1bs+sxfFsf7Ytr+iq+5JJoYXA@mail.gmail.com
This commit is contained in:
Teodor Sigaev
2018-04-07 16:59:14 +03:00
parent 971d7ddbe1
commit b508a56f2f
8 changed files with 802 additions and 1 deletions
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3
src/backend/access/hash/hashinsert.c
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@@ -22,6 +22,7 @@
#include "utils/rel.h"
#include "storage/lwlock.h"
#include "storage/buf_internals.h"
#include "storage/predicate.h"
static void _hash_vacuum_one_page(Relation rel, Buffer metabuf, Buffer buf,
RelFileNode hnode);
@@ -88,6 +89,8 @@ restart_insert:
&usedmetap);
Assert(usedmetap != NULL);
CheckForSerializableConflictIn(rel, NULL, buf);
/* remember the primary bucket buffer to release the pin on it at end. */
bucket_buf = buf;