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Add new function pg_get_wal_summarizer_state().

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This makes it possible to access information about the progress
of WAL summarization from SQL. The previously-added functions
pg_available_wal_summaries() and pg_wal_summary_contents() only
examine on-disk state, but this function exposes information from
the server's shared memory.

Discussion: http://postgr.es/m/CA+Tgmobvqqj-DW9F7uUzT-cQqs6wcVb-Xhs=w=hzJnXSE-kRGw@mail.gmail.com
This commit is contained in:
Robert Haas
2024-01-11 12:41:18 -05:00
parent 544bcb5a5e
commit d9ef650fca
6 changed files with 146 additions and 1 deletions
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28
doc/src/sgml/func.sgml
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@ -26554,6 +26554,34 @@ SELECT collation for ('foo' COLLATE "de_DE");
<literal>relblocknumber</literal> will be zero.
</para></entry>
</row>
<row>
<entry role="func_table_entry"><para role="func_signature">
<indexterm>
<primary>pg_get_wal_summarizer_state</primary>
</indexterm>
<function>pg_get_wal_summarizer_state</function> ()
<returnvalue>record</returnvalue>
( <parameter>summarized_tli</parameter> <type>bigint</type>,
<parameter>summarized_lsn</parameter> <type>pg_lsn</type>,
<parameter>pending_lsn</parameter> <type>pg_lsn</type>,
<parameter>summarizer_pid</parameter> <type>int</type> )
</para>
<para>
Returns information about the progress of the WAL summarizer. If the
WAL summarizer has never run since the instance was started, then
<literal>summarized_tli</literal> and <literal>summarized_lsn</literal>
will be <literal>0</literal> and <literal>0/0</literal> respectively;
otherwise, they will be the TLI and ending LSN of the last WAL summary
file written to disk. If the WAL summarizer is currently running,
<literal>pending_lsn</literal> will be the ending LSN of the last
record that it has consumed, which must always be greater than or
equal to <literal>summarized_lsn</literal>; if the WAL summarizer is
not running, it will be equal to <literal>summarized_lsn</literal>.
<literal>summarized_pid</literal> is the PID of the WAL summarizer
process, if it is running, and otherwise NULL.
</para></entry>
</row>
</tbody>
</tgroup>
</table>