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| author | Alexander Korotkov <akorotkov@postgresql.org> | 2020-04-07 23:51:10 +0300 |
|---|---|---|
| committer | Alexander Korotkov <akorotkov@postgresql.org> | 2020-04-07 23:51:10 +0300 |
| commit | 0f5ca02f53ac2b211d8518f0882c49284c0c9610 (patch) | |
| tree | a5dce13eaa64e00a6ec95b913a155efe7f91c99c /src/include/commands/wait.h | |
| parent | 357889eb17bb9c9336c4f324ceb1651da616fe57 (diff) | |
| download | postgresql-0f5ca02f53ac2b211d8518f0882c49284c0c9610.tar.gz postgresql-0f5ca02f53ac2b211d8518f0882c49284c0c9610.zip | |
Implement waiting for given lsn at transaction start
This commit adds following optional clause to BEGIN and START TRANSACTION
commands.
WAIT FOR LSN lsn [ TIMEOUT timeout ]
New clause pospones transaction start till given lsn is applied on standby.
This clause allows user be sure, that changes previously made on primary would
be visible on standby.
New shared memory struct is used to track awaited lsn per backend. Recovery
process wakes up backend once required lsn is applied.
Author: Ivan Kartyshov, Anna Akenteva
Reviewed-by: Craig Ringer, Thomas Munro, Robert Haas, Kyotaro Horiguchi
Reviewed-by: Masahiko Sawada, Ants Aasma, Dmitry Ivanov, Simon Riggs
Reviewed-by: Amit Kapila, Alexander Korotkov
Discussion: https://postgr.es/m/0240c26c-9f84-30ea-fca9-93ab2df5f305%40postgrespro.ru
Diffstat (limited to 'src/include/commands/wait.h')
| -rw-r--r-- | src/include/commands/wait.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/src/include/commands/wait.h b/src/include/commands/wait.h new file mode 100644 index 00000000000..2a95c95d2b7 --- /dev/null +++ b/src/include/commands/wait.h @@ -0,0 +1,26 @@ +/*------------------------------------------------------------------------- + * + * wait.h + * prototypes for commands/wait.c + * + * Copyright (c) 2020, PostgreSQL Global Development Group + * + * src/include/commands/wait.h + * + *------------------------------------------------------------------------- + */ +#ifndef WAIT_H +#define WAIT_H + +#include "tcop/dest.h" +#include "nodes/parsenodes.h" + +extern bool WaitLSNUtility(XLogRecPtr lsn, const int timeout_ms); +extern Size WaitLSNShmemSize(void); +extern void WaitLSNShmemInit(void); +extern void WaitLSNSetLatch(XLogRecPtr cur_lsn); +extern XLogRecPtr WaitLSNGetMin(void); +extern int WaitLSNMain(WaitClause *stmt, DestReceiver *dest); +extern void WaitLSNDelete(void); + +#endif /* WAIT_H */ |