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Add prepare API support for streaming transactions in logical replication.

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Commit a8fd13cab0 added support for prepared transactions to built-in
logical replication via a new option "two_phase" for a subscription. The
"two_phase" option was not allowed with the existing streaming option.

This commit permits the combination of "streaming" and "two_phase"
subscription options. It extends the pgoutput plugin and the subscriber
side code to add the prepare API for streaming transactions which will
apply the changes accumulated in the spool-file at prepare time.

Author: Peter Smith and Ajin Cherian
Reviewed-by: Vignesh C, Amit Kapila, Greg Nancarrow
Tested-By: Haiying Tang
Discussion: https://postgr.es/m/02DA5F5E-CECE-4D9C-8B4B-418077E2C010@postgrespro.ru
Discussion: https://postgr.es/m/CAMGcDxeqEpWj3fTXwqhSwBdXd2RS9jzwWscO-XbeCfso6ts3+Q@mail.gmail.com
This commit is contained in:
Amit Kapila
2021-08-04 07:47:06 +05:30
parent 6424337073
commit 63cf61cdeb
12 changed files with 667 additions and 79 deletions
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8
src/include/replication/logicalproto.h
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@@ -67,7 +67,8 @@ typedef enum LogicalRepMsgType
LOGICAL_REP_MSG_STREAM_START = 'S',
LOGICAL_REP_MSG_STREAM_END = 'E',
LOGICAL_REP_MSG_STREAM_COMMIT = 'c',
LOGICAL_REP_MSG_STREAM_ABORT = 'A'
LOGICAL_REP_MSG_STREAM_ABORT = 'A',
LOGICAL_REP_MSG_STREAM_PREPARE = 'p'
} LogicalRepMsgType;
/*
@@ -196,7 +197,10 @@ extern void logicalrep_write_rollback_prepared(StringInfo out, ReorderBufferTXN
TimestampTz prepare_time);
extern void logicalrep_read_rollback_prepared(StringInfo in,
LogicalRepRollbackPreparedTxnData *rollback_data);
extern void logicalrep_write_stream_prepare(StringInfo out, ReorderBufferTXN *txn,
XLogRecPtr prepare_lsn);
extern void logicalrep_read_stream_prepare(StringInfo in,
LogicalRepPreparedTxnData *prepare_data);
extern void logicalrep_write_origin(StringInfo out, const char *origin,
XLogRecPtr origin_lsn);