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Create a new dedicated Postgres process, "wal writer", which exists to write

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and fsync WAL at convenient intervals.  For the moment it just tries to
offload this work from backends, but soon it will be responsible for
guaranteeing a maximum delay before asynchronously-committed transactions
will be flushed to disk.

This is a portion of Simon Riggs' async-commit patch, committed to CVS
separately because a background WAL writer seems like it might be a good idea
independently of the async-commit feature.  I rebased walwriter.c on
bgwriter.c because it seemed like a more appropriate way of handling signals;
while the startup/shutdown logic in postmaster.c is more like autovac because
we want walwriter to quit before we start the shutdown checkpoint.
This commit is contained in:
Tom Lane
2007-07-24 04:54:09 +00:00
parent 53d2951be7
commit ad4295728e
11 changed files with 547 additions and 70 deletions
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3
src/include/access/xlog.h
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@@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/xlog.h,v 1.80 2007/06/30 19:12:02 tgl Exp $
* $PostgreSQL: pgsql/src/include/access/xlog.h,v 1.81 2007/07/24 04:54:09 tgl Exp $
*/
#ifndef XLOG_H
#define XLOG_H
@@ -196,6 +196,7 @@ extern CheckpointStatsData CheckpointStats;
extern XLogRecPtr XLogInsert(RmgrId rmid, uint8 info, XLogRecData *rdata);
extern void XLogFlush(XLogRecPtr RecPtr);
extern void XLogBackgroundFlush(void);
extern bool XLogNeedsFlush(XLogRecPtr RecPtr);
extern void xlog_redo(XLogRecPtr lsn, XLogRecord *record);