Introduce Streaming Replication.

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

2 files changed, 8 insertions, 3 deletions

diff --git a/src/include/catalog/catversion.h b/src/include/catalog/catversion.h
index e981823320c..b2c92860f07 100644
--- a/src/include/catalog/catversion.h
+++ b/src/include/catalog/catversion.h
@@ -37,7 +37,7 @@
  * Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/catalog/catversion.h,v 1.572 2010/01/14 16:31:09 teodor Exp $
+ * $PostgreSQL: pgsql/src/include/catalog/catversion.h,v 1.573 2010/01/15 09:19:07 heikki Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -53,6 +53,6 @@
  */
 
 /*							yyyymmddN */
-#define CATALOG_VERSION_NO	201001141
+#define CATALOG_VERSION_NO	201001151
 
 #endif
diff --git a/src/include/catalog/pg_proc.h b/src/include/catalog/pg_proc.h
index 7a16e3faa73..a498cc51720 100644
--- a/src/include/catalog/pg_proc.h
+++ b/src/include/catalog/pg_proc.h
@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/catalog/pg_proc.h,v 1.561 2010/01/14 16:31:09 teodor Exp $
+ * $PostgreSQL: pgsql/src/include/catalog/pg_proc.h,v 1.562 2010/01/15 09:19:07 heikki Exp $
  *
  * NOTES
  *	  The script catalog/genbki.pl reads this file and generates .bki
@@ -3290,6 +3290,11 @@ DESCR("xlog filename, given an xlog location");
 DATA(insert OID = 3810 (  pg_is_in_recovery 	PGNSP PGUID 12 1 0 0 f f f t f v 0 0 16 "" _null_ _null_ _null_ _null_ pg_is_in_recovery _null_ _null_ _null_ ));
 DESCR("true if server is in recovery");
 
+DATA(insert OID = 3820 ( pg_last_xlog_receive_location	PGNSP PGUID 12 1 0 0 f f f t f v 0 0 25 "" _null_ _null_ _null_ _null_ pg_last_xlog_receive_location _null_ _null_ _null_ ));
+DESCR("current xlog flush location");
+DATA(insert OID = 3821 ( pg_last_xlog_replay_location	PGNSP PGUID 12 1 0 0 f f f t f v 0 0 25 "" _null_ _null_ _null_ _null_ pg_last_xlog_replay_location _null_ _null_ _null_ ));
+DESCR("last xlog replay location");
+
 DATA(insert OID = 2621 ( pg_reload_conf			PGNSP PGUID 12 1 0 0 f f f t f v 0 0 16 "" _null_ _null_ _null_ _null_ pg_reload_conf _null_ _null_ _null_ ));
 DESCR("reload configuration files");
 DATA(insert OID = 2622 ( pg_rotate_logfile		PGNSP PGUID 12 1 0 0 f f f t f v 0 0 16 "" _null_ _null_ _null_ _null_ pg_rotate_logfile _null_ _null_ _null_ ));