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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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22
src/backend/utils/init/postinit.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/init/postinit.c,v 1.200 2010/01/02 16:57:56 momjian Exp $
* $PostgreSQL: pgsql/src/backend/utils/init/postinit.c,v 1.201 2010/01/15 09:19:04 heikki Exp $
*
*
*-------------------------------------------------------------------------
@ -36,6 +36,7 @@
#include "pgstat.h"
#include "postmaster/autovacuum.h"
#include "postmaster/postmaster.h"
#include "replication/walsender.h"
#include "storage/bufmgr.h"
#include "storage/fd.h"
#include "storage/ipc.h"
@ -446,6 +447,7 @@ BaseInit(void)
* In bootstrap mode no parameters are used. The autovacuum launcher process
* doesn't use any parameters either, because it only goes far enough to be
* able to read pg_database; it doesn't connect to any particular database.
* In walsender mode only username is used.
*
* As of PostgreSQL 8.2, we expect InitProcess() was already called, so we
* already have a PGPROC struct ... but it's not completely filled in yet.
@ -557,10 +559,10 @@ InitPostgres(const char *in_dbname, Oid dboid, const char *username,
* Set up the global variables holding database id and default tablespace.
* But note we won't actually try to touch the database just yet.
*
* We take a shortcut in the bootstrap case, otherwise we have to look up
* the db's entry in pg_database.
* We take a shortcut in the bootstrap and walsender case, otherwise we
* have to look up the db's entry in pg_database.
*/
if (bootstrap)
if (bootstrap || am_walsender)
{
MyDatabaseId = TemplateDbOid;
MyDatabaseTableSpace = DEFAULTTABLESPACE_OID;
@ -623,7 +625,7 @@ InitPostgres(const char *in_dbname, Oid dboid, const char *username,
* AccessShareLock for such sessions and thereby not conflict against
* CREATE DATABASE.
*/
if (!bootstrap)
if (!bootstrap && !am_walsender)
LockSharedObject(DatabaseRelationId, MyDatabaseId, 0,
RowExclusiveLock);
@ -632,7 +634,7 @@ InitPostgres(const char *in_dbname, Oid dboid, const char *username,
* If there was a concurrent DROP DATABASE, this ensures we will die
* cleanly without creating a mess.
*/
if (!bootstrap)
if (!bootstrap && !am_walsender)
{
HeapTuple tuple;
@ -652,7 +654,7 @@ InitPostgres(const char *in_dbname, Oid dboid, const char *username,
*/
fullpath = GetDatabasePath(MyDatabaseId, MyDatabaseTableSpace);
if (!bootstrap)
if (!bootstrap && !am_walsender)
{
if (access(fullpath, F_OK) == -1)
{
@ -727,7 +729,7 @@ InitPostgres(const char *in_dbname, Oid dboid, const char *username,
* database-access infrastructure is up. (Also, it wants to know if the
* user is a superuser, so the above stuff has to happen first.)
*/
if (!bootstrap)
if (!bootstrap && !am_walsender)
CheckMyDatabase(dbname, am_superuser);
/*
@ -824,6 +826,10 @@ InitPostgres(const char *in_dbname, Oid dboid, const char *username,
/* initialize client encoding */
InitializeClientEncoding();
/* reset the database for walsender */
if (am_walsender)
MyProc->databaseId = MyDatabaseId = InvalidOid;
/* report this backend in the PgBackendStatus array */
if (!bootstrap)
pgstat_bestart();