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Ability to advance replication slots

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Ability to advance both physical and logical replication slots using a
new user function pg_replication_slot_advance().

For logical advance that means records are consumed as fast as possible
and changes are not given to output plugin for sending. Makes 2nd phase
(after we reached SNAPBUILD_FULL_SNAPSHOT) of replication slot creation
faster, especially when there are big transactions as the reorder buffer
does not have to deal with data changes and does not have to spill to
disk.

Author: Petr Jelinek
Reviewed-by: Simon Riggs
This commit is contained in:
Simon Riggs
2018-01-17 11:38:34 +00:00
parent 585e166e46
commit 9c7d06d606
10 changed files with 333 additions and 17 deletions
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19
doc/src/sgml/func.sgml
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@ -19155,6 +19155,25 @@ postgres=# SELECT * FROM pg_walfile_name_offset(pg_stop_backup());
</entry>
</row>
<row>
<entry>
<indexterm>
<primary>pg_replication_slot_advance</primary>
</indexterm>
<literal><function>pg_replication_slot_advance(<parameter>slot_name</parameter> <type>name</type>, <parameter>upto_lsn</parameter> <type>pg_lsn</type>)</function></literal>
</entry>
<entry>
(<parameter>slot_name</parameter> <type>name</type>, <parameter>end_lsn</parameter> <type>pg_lsn</type>)
<type>bool</type>
</entry>
<entry>
Advances the current confirmed position of a replication slot named
<parameter>slot_name</parameter>. The slot will not be moved backwards,
and it will not be moved beyond the current insert location. Returns
name of the slot and real position to which it was advanced to.
</entry>
</row>
<row>
<entry id="pg-replication-origin-create">
<indexterm>