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Add -F option to pg_receivexlog, for specifying fsync interval.

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This allows us to specify the maximum time to issue fsync to ensure
the received WAL file is safely flushed to disk. Without this,
pg_receivexlog always flushes WAL file only when it's closed and
which can cause WAL data to be lost at the event of a crash.

Furuya Osamu, heavily modified by me.
This commit is contained in:
Fujii Masao
2014-08-08 16:50:54 +09:00
parent 1add956ac7
commit 3dad73e71f
5 changed files with 195 additions and 70 deletions
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15
doc/src/sgml/ref/pg_receivexlog.sgml
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@@ -105,6 +105,21 @@ PostgreSQL documentation
</listitem>
</varlistentry>
<varlistentry>
<term><option>-F <replaceable class="parameter">interval</replaceable></option></term>
<term><option>--fsync-interval=<replaceable class="parameter">interval</replaceable></option></term>
<listitem>
<para>
Specifies the maximum time to issue sync commands to ensure the
received WAL file is safely flushed to disk, in seconds. The default
value is zero, which disables issuing fsyncs except when WAL file is
closed. If <literal>-1</literal> is specified, WAL file is flushed as
soon as possible, that is, as soon as there are WAL data which has
not been flushed yet.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-v</option></term>
<term><option>--verbose</option></term>