database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-09-02 04:21:28 +03:00
Code Activity

Cascading replication feature for streaming log-based replication.

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

5
src/include/replication/walsender.h
View File

@@ -35,6 +35,7 @@ typedef struct WalSnd
pid_t pid; /* this walsender's process id, or 0 */
WalSndState state; /* this walsender's state */
XLogRecPtr sentPtr; /* WAL has been sent up to this point */
bool needreload; /* does currently-open file need to be reloaded? */
/*
* The xlog locations that have been written, flushed, and applied by
@@ -92,6 +93,7 @@ extern WalSndCtlData *WalSndCtl;
/* global state */
extern bool am_walsender;
extern bool am_cascading_walsender;
extern volatile sig_atomic_t walsender_shutdown_requested;
extern volatile sig_atomic_t walsender_ready_to_stop;
@@ -106,7 +108,8 @@ extern Size WalSndShmemSize(void);
extern void WalSndShmemInit(void);
extern void WalSndWakeup(void);
extern void WalSndSetState(WalSndState state);
extern void XLogRead(char *buf, XLogRecPtr recptr, Size nbytes);
extern void XLogRead(char *buf, XLogRecPtr startptr, Size count);
extern void WalSndRqstFileReload(void);
extern Datum pg_stat_get_wal_senders(PG_FUNCTION_ARGS);