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Allow pg_create_physical_replication_slot() to reserve WAL.

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When creating a physical slot it's often useful to immediately reserve
the current WAL position instead of only doing after the first feedback
message arrives. That e.g. allows slots to guarantee that all the WAL
for a base backup will be available afterwards.

Logical slots already have to reserve WAL during creation, so generalize
that logic into being usable for both physical and logical slots.

Catversion bump because of the new parameter.

Author: Gurjeet Singh
Reviewed-By: Andres Freund
Discussion: CABwTF4Wh_dBCzTU=49pFXR6coR4NW1ynb+vBqT+Po=7fuq5iCw@mail.gmail.com
This commit is contained in:
Andres Freund
2015-08-11 12:34:31 +02:00
parent 093d0c83c1
commit 6fcd88511f
8 changed files with 107 additions and 52 deletions
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8
doc/src/sgml/func.sgml
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@ -17211,7 +17211,7 @@ postgres=# SELECT * FROM pg_xlogfile_name_offset(pg_stop_backup());
<indexterm>
<primary>pg_create_physical_replication_slot</primary>
</indexterm>
<literal><function>pg_create_physical_replication_slot(<parameter>slot_name</parameter> <type>name</type>)</function></literal>
<literal><function>pg_create_physical_replication_slot(<parameter>slot_name</parameter> <type>name</type><optional>, <parameter>immediately_reserve</> <type>boolean</> </optional>)</function></literal>
</entry>
<entry>
(<parameter>slot_name</parameter> <type>name</type>, <parameter>xlog_position</parameter> <type>pg_lsn</type>)
@ -17221,7 +17221,11 @@ postgres=# SELECT * FROM pg_xlogfile_name_offset(pg_stop_backup());
<parameter>slot_name</parameter>. Streaming changes from a physical slot
is only possible with the streaming-replication protocol - see <xref
linkend="protocol-replication">. Corresponds to the replication protocol
command <literal>CREATE_REPLICATION_SLOT ... PHYSICAL</literal>.
command <literal>CREATE_REPLICATION_SLOT ... PHYSICAL</literal>. The optional
second parameter, when <literal>true</>, specifies that the <acronym>LSN</>
for this replication slot be reserved immediately; the <acronym<LSN</>
is otherwise reserved on first connection from a streaming replication
client.
</entry>
</row>
<row>