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Introduce Streaming Replication.

Browse Source 
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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26
src/backend/bootstrap/bootstrap.c
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@ -8,7 +8,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/bootstrap/bootstrap.c,v 1.255 2010/01/02 16:57:36 momjian Exp $
* $PostgreSQL: pgsql/src/backend/bootstrap/bootstrap.c,v 1.256 2010/01/15 09:19:00 heikki Exp $
*
*-------------------------------------------------------------------------
*/
@ -32,6 +32,7 @@
#include "nodes/makefuncs.h"
#include "postmaster/bgwriter.h"
#include "postmaster/walwriter.h"
#include "replication/walreceiver.h"
#include "storage/bufmgr.h"
#include "storage/ipc.h"
#include "storage/proc.h"
@ -173,7 +174,7 @@ static IndexList *ILHead = NULL;
* AuxiliaryProcessMain
*
* The main entry point for auxiliary processes, such as the bgwriter,
* walwriter, bootstrapper and the shared memory checker code.
* walwriter, walreceiver, bootstrapper and the shared memory checker code.
*
* This code is here just because of historical reasons.
*/
@ -314,6 +315,9 @@ AuxiliaryProcessMain(int argc, char *argv[])
case WalWriterProcess:
statmsg = "wal writer process";
break;
case WalReceiverProcess:
statmsg = "wal receiver process";
break;
default:
statmsg = "??? process";
break;
@ -419,6 +423,24 @@ AuxiliaryProcessMain(int argc, char *argv[])
WalWriterMain();
proc_exit(1); /* should never return */
case WalReceiverProcess:
/* don't set signals, walreceiver has its own agenda */
{
PGFunction WalReceiverMain;
/*
* Walreceiver is not linked directly into the server
* binary because we would then need to link the server
* with libpq. It's compiled as a dynamically loaded module
* to avoid that.
*/
WalReceiverMain = load_external_function("walreceiver",
"WalReceiverMain",
true, NULL);
WalReceiverMain(NULL);
}
proc_exit(1); /* should never return */
default:
elog(PANIC, "unrecognized process type: %d", auxType);
proc_exit(1);