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Cascading replication feature for streaming log-based replication.

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Standby servers can now have WALSender processes, which can work with
either WALReceiver or archive_commands to pass data. Fully updated
docs, including new conceptual terms of sending server, upstream and
downstream servers. WALSenders terminated when promote to master.

Fujii Masao, review, rework and doc rewrite by Simon Riggs
This commit is contained in:
Simon Riggs
2011-07-19 03:40:03 +01:00
parent 3d4890c0c5
commit 5286105800
10 changed files with 424 additions and 190 deletions
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6
src/include/access/xlog.h
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@ -221,6 +221,9 @@ extern int wal_level;
/* Do we need to WAL-log information required only for Hot Standby? */
#define XLogStandbyInfoActive() (wal_level >= WAL_LEVEL_HOT_STANDBY)
/* Can we allow the standby to accept replication connection from another standby? */
#define AllowCascadeReplication() (EnableHotStandby && max_wal_senders > 0)
#ifdef WAL_DEBUG
extern bool XLOG_DEBUG;
#endif
@ -292,7 +295,8 @@ extern bool RecoveryInProgress(void);
extern bool HotStandbyActive(void);
extern bool XLogInsertAllowed(void);
extern void GetXLogReceiptTime(TimestampTz *rtime, bool *fromStream);
extern XLogRecPtr GetXLogReplayRecPtr(void);
extern XLogRecPtr GetXLogReplayRecPtr(XLogRecPtr *restoreLastRecPtr);
extern XLogRecPtr GetStandbyFlushRecPtr(void);
extern void UpdateControlFile(void);
extern uint64 GetSystemIdentifier(void);