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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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27
src/include/access/xlog.h
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@@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/xlog.h,v 1.95 2010/01/02 16:58:00 momjian Exp $
* $PostgreSQL: pgsql/src/include/access/xlog.h,v 1.96 2010/01/15 09:19:06 heikki Exp $
*/
#ifndef XLOG_H
#define XLOG_H
@@ -188,6 +188,18 @@ extern int MaxStandbyDelay;
#define XLogArchiveCommandSet() (XLogArchiveCommand[0] != '\0')
#define XLogStandbyInfoActive() (XLogRequestRecoveryConnections && XLogArchiveMode)
/*
* This is in walsender.c, but declared here so that we don't need to include
* walsender.h in all files that check XLogIsNeeded()
*/
extern int MaxWalSenders;
/*
* Is WAL-logging necessary? We need to log an XLOG record iff either
* WAL archiving is enabled or XLOG streaming is allowed.
*/
#define XLogIsNeeded() (XLogArchivingActive() || (MaxWalSenders > 0))
#ifdef WAL_DEBUG
extern bool XLOG_DEBUG;
#endif
@@ -228,12 +240,19 @@ typedef struct CheckpointStatsData
extern CheckpointStatsData CheckpointStats;
/* Read from recovery.conf, in startup process */
extern char *TriggerFile;
extern XLogRecPtr XLogInsert(RmgrId rmid, uint8 info, XLogRecData *rdata);
extern void XLogFlush(XLogRecPtr RecPtr);
extern void XLogBackgroundFlush(void);
extern void XLogAsyncCommitFlush(void);
extern bool XLogNeedsFlush(XLogRecPtr RecPtr);
extern int XLogFileInit(uint32 log, uint32 seg,
bool *use_existent, bool use_lock);
extern int XLogFileOpen(uint32 log, uint32 seg);
extern void XLogSetAsyncCommitLSN(XLogRecPtr record);
@@ -242,11 +261,14 @@ extern void RestoreBkpBlocks(XLogRecPtr lsn, XLogRecord *record, bool cleanup);
extern void xlog_redo(XLogRecPtr lsn, XLogRecord *record);
extern void xlog_desc(StringInfo buf, uint8 xl_info, char *rec);
extern void issue_xlog_fsync(int fd, uint32 log, uint32 seg);
extern bool RecoveryInProgress(void);
extern bool XLogInsertAllowed(void);
extern TimestampTz GetLatestXLogTime(void);
extern void UpdateControlFile(void);
extern uint64 GetSystemIdentifier(void);
extern Size XLOGShmemSize(void);
extern void XLOGShmemInit(void);
extern void BootStrapXLOG(void);
@@ -258,8 +280,11 @@ extern bool CreateRestartPoint(int flags);
extern void XLogPutNextOid(Oid nextOid);
extern XLogRecPtr GetRedoRecPtr(void);
extern XLogRecPtr GetInsertRecPtr(void);
extern XLogRecPtr GetWriteRecPtr(void);
extern void GetNextXidAndEpoch(TransactionId *xid, uint32 *epoch);
extern TimeLineID GetRecoveryTargetTLI(void);
extern void HandleStartupProcInterrupts(void);
extern void StartupProcessMain(void);
#endif /* XLOG_H */