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Replace the KnownAssignedXids hash table with a sorted-array data structure,

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and be more tense about the locking requirements for it, to improve performance
in Hot Standby mode.  In passing fix a few bugs and improve a number of
comments in the existing HS code.

Simon Riggs, with some editorialization by Tom
This commit is contained in:
Tom Lane 2010-04-28 00:09:05 +00:00
parent 871e73bb27
commit 2871b4618a
2 changed files with 766 additions and 326 deletions
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5
src/backend/access/transam/twophase.c
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1994, Regents of the University of California * Portions Copyright (c) 1994, Regents of the University of California
* *
* IDENTIFICATION * IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/transam/twophase.c,v 1.60 2010/04/13 14:17:46 heikki Exp $ * $PostgreSQL: pgsql/src/backend/access/transam/twophase.c,v 1.61 2010/04/28 00:09:05 tgl Exp $
* *
* NOTES * NOTES
* Each global transaction is associated with a global transaction * Each global transaction is associated with a global transaction
@ -1200,6 +1200,9 @@ StandbyTransactionIdIsPrepared(TransactionId xid)
Assert(TransactionIdIsValid(xid)); Assert(TransactionIdIsValid(xid));
if (max_prepared_xacts <= 0)
return false; /* nothing to do */
/* Read and validate file */ /* Read and validate file */
buf = ReadTwoPhaseFile(xid, false); buf = ReadTwoPhaseFile(xid, false);
if (buf == NULL) if (buf == NULL)

1087
src/backend/storage/ipc/procarray.c
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