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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/backend/nodes/copyfuncs.c | |
| 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/backend/nodes/copyfuncs.c')
| -rw-r--r-- | src/backend/nodes/copyfuncs.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/src/backend/nodes/copyfuncs.c b/src/backend/nodes/copyfuncs.c index 1525c0de725..db179becab5 100644 --- a/src/backend/nodes/copyfuncs.c +++ b/src/backend/nodes/copyfuncs.c @@ -3748,10 +3748,22 @@ _copyTransactionStmt(const TransactionStmt *from) COPY_STRING_FIELD(savepoint_name); COPY_STRING_FIELD(gid); COPY_SCALAR_FIELD(chain); + COPY_NODE_FIELD(wait); return newnode; } +static WaitClause * +_copyWaitClause(const WaitClause *from) +{ + WaitClause *newnode = makeNode(WaitClause); + + COPY_STRING_FIELD(lsn); + COPY_SCALAR_FIELD(timeout); + + return newnode; +}; + static CompositeTypeStmt * _copyCompositeTypeStmt(const CompositeTypeStmt *from) { @@ -5339,6 +5351,9 @@ copyObjectImpl(const void *from) case T_TransactionStmt: retval = _copyTransactionStmt(from); break; + case T_WaitClause: + retval = _copyWaitClause(from); + break; case T_CompositeTypeStmt: retval = _copyCompositeTypeStmt(from); break; |