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Introduce Streaming Replication.

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This includes two new kinds of postmaster processes, walsenders and
walreceiver. Walreceiver is responsible for connecting to the primary server
and streaming WAL to disk, while walsender runs in the primary server and
streams WAL from disk to the client.

Documentation still needs work, but the basics are there. We will probably
pull the replication section to a new chapter later on, as well as the
sections describing file-based replication. But let's do that as a separate
patch, so that it's easier to see what has been added/changed. This patch
also adds a new section to the chapter about FE/BE protocol, documenting the
protocol used by walsender/walreceivxer.

Bump catalog version because of two new functions,
pg_last_xlog_receive_location() and pg_last_xlog_replay_location(), for
monitoring the progress of replication.

Fujii Masao, with additional hacking by me
This commit is contained in:
Heikki Linnakangas
2010-01-15 09:19:10 +00:00
parent 4cbe473938
commit 40f908bdcd
53 changed files with 3567 additions and 220 deletions
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7
doc/src/sgml/perform.sgml
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@@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/perform.sgml,v 1.72 2009/08/07 20:54:31 alvherre Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/perform.sgml,v 1.73 2010/01/15 09:18:59 heikki Exp $ -->
<chapter id="performance-tips">
<title>Performance Tips</title>
@@ -836,8 +836,9 @@ SELECT * FROM x, y, a, b, c WHERE something AND somethingelse;
needs to be written, because in case of an error, the files
containing the newly loaded data will be removed anyway.
However, this consideration does not apply when
<xref linkend="guc-archive-mode"> is on, as all commands
must write WAL in that case.
<xref linkend="guc-archive-mode"> is on or streaming replication
is allowed (i.e., <xref linkend="guc-max-wal-senders"> is more
than or equal to one), as all commands must write WAL in that case.
</para>
</sect2>