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Unconditionally write the statsfile when SIGHUP is received, to minimize

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the window during which backends have no statistics file to read.
This commit is contained in:
Magnus Hagander 2008-08-25 18:55:43 +00:00
parent d96d7be2b5
commit f1e237b6b2
2 changed files with 7 additions and 4 deletions
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6
doc/src/sgml/config.sgml
View File

@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.188 2008/08/25 15:11:00 mha Exp $ --> <!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.189 2008/08/25 18:55:43 mha Exp $ -->
<chapter Id="runtime-config"> <chapter Id="runtime-config">
<title>Server Configuration</title> <title>Server Configuration</title>
@ -3419,8 +3419,8 @@ COPY postgres_log FROM '/full/path/to/logfile.csv' WITH csv;
<filename>pg_stat_tmp</filename>. Pointing this at a RAM based filesystem <filename>pg_stat_tmp</filename>. Pointing this at a RAM based filesystem
will decrease physical I/O requirements and can lead to increased will decrease physical I/O requirements and can lead to increased
performance. If this parameter is changed when the system is running, performance. If this parameter is changed when the system is running,
the statistics functions might return no information until a new there is a small window of time until the new file has been written
file has been written, which typically happens twice per second. during which the statistics functions might return no information.
</para> </para>
</listitem> </listitem>
</varlistentry> </varlistentry>

5
src/backend/postmaster/pgstat.c
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@ -13,7 +13,7 @@
* *
* Copyright (c) 2001-2008, PostgreSQL Global Development Group * Copyright (c) 2001-2008, PostgreSQL Global Development Group
* *
* $PostgreSQL: pgsql/src/backend/postmaster/pgstat.c,v 1.180 2008/08/25 15:11:00 mha Exp $ * $PostgreSQL: pgsql/src/backend/postmaster/pgstat.c,v 1.181 2008/08/25 18:55:43 mha Exp $
* ---------- * ----------
*/ */
#include "postgres.h" #include "postgres.h"
@ -2638,11 +2638,14 @@ PgstatCollectorMain(int argc, char *argv[])
/* /*
* Reload configuration if we got SIGHUP from the postmaster. * Reload configuration if we got SIGHUP from the postmaster.
* Also, signal a new write of the file, so we drop a new file as
* soon as possible of the directory for it changes.
*/ */
if (got_SIGHUP) if (got_SIGHUP)
{ {
ProcessConfigFile(PGC_SIGHUP); ProcessConfigFile(PGC_SIGHUP);
got_SIGHUP = false; got_SIGHUP = false;
need_statwrite = true;
} }
/* /*