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hash: Add write-ahead logging support.

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The warning about hash indexes not being write-ahead logged and their
use being discouraged has been removed.  "snapshot too old" is now
supported for tables with hash indexes.  Most importantly, barring
bugs, hash indexes will now be crash-safe and usable on standbys.

This commit doesn't yet add WAL consistency checking for hash
indexes, as we now have for other index types; a separate patch has
been submitted to cure that lack.

Amit Kapila, reviewed and slightly modified by me.  The larger patch
series of which this is a part has been reviewed and tested by Álvaro
Herrera, Ashutosh Sharma, Mark Kirkwood, Jeff Janes, and Jesper
Pedersen.

Discussion: http://postgr.es/m/CAA4eK1JOBX=YU33631Qh-XivYXtPSALh514+jR8XeD7v+K3r_Q@mail.gmail.com
This commit is contained in:
Robert Haas
2017-03-14 13:27:02 -04:00
parent 2b32ac2a59
commit c11453ce0a
25 changed files with 2001 additions and 140 deletions
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5
src/backend/commands/indexcmds.c
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@ -506,11 +506,6 @@ DefineIndex(Oid relationId,
accessMethodForm = (Form_pg_am) GETSTRUCT(tuple);
amRoutine = GetIndexAmRoutine(accessMethodForm->amhandler);
if (strcmp(accessMethodName, "hash") == 0 &&
RelationNeedsWAL(rel))
ereport(WARNING,
(errmsg("hash indexes are not WAL-logged and their use is discouraged")));
if (stmt->unique && !amRoutine->amcanunique)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),