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Add prepare API support for streaming transactions in logical replication.

Browse Source 
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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29
src/backend/replication/logical/proto.c
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@@ -145,7 +145,8 @@ logicalrep_read_begin_prepare(StringInfo in, LogicalRepPreparedTxnData *begin_da
}
/*
* The core functionality for logicalrep_write_prepare.
* The core functionality for logicalrep_write_prepare and
* logicalrep_write_stream_prepare.
*/
static void
logicalrep_write_prepare_common(StringInfo out, LogicalRepMsgType type,
@@ -188,7 +189,8 @@ logicalrep_write_prepare(StringInfo out, ReorderBufferTXN *txn,
}
/*
* The core functionality for logicalrep_read_prepare.
* The core functionality for logicalrep_read_prepare and
* logicalrep_read_stream_prepare.
*/
static void
logicalrep_read_prepare_common(StringInfo in, char *msgtype,
@@ -209,6 +211,8 @@ logicalrep_read_prepare_common(StringInfo in, char *msgtype,
elog(ERROR, "end_lsn is not set in %s message", msgtype);
prepare_data->prepare_time = pq_getmsgint64(in);
prepare_data->xid = pq_getmsgint(in, 4);
if (prepare_data->xid == InvalidTransactionId)
elog(ERROR, "invalid two-phase transaction ID in %s message", msgtype);
/* read gid (copy it into a pre-allocated buffer) */
strlcpy(prepare_data->gid, pq_getmsgstring(in), sizeof(prepare_data->gid));
@@ -339,6 +343,27 @@ logicalrep_read_rollback_prepared(StringInfo in,
strlcpy(rollback_data->gid, pq_getmsgstring(in), sizeof(rollback_data->gid));
}
/*
* Write STREAM PREPARE to the output stream.
*/
void
logicalrep_write_stream_prepare(StringInfo out,
ReorderBufferTXN *txn,
XLogRecPtr prepare_lsn)
{
logicalrep_write_prepare_common(out, LOGICAL_REP_MSG_STREAM_PREPARE,
txn, prepare_lsn);
}
/*
* Read STREAM PREPARE from the stream.
*/
void
logicalrep_read_stream_prepare(StringInfo in, LogicalRepPreparedTxnData *prepare_data)
{
logicalrep_read_prepare_common(in, "stream prepare", prepare_data);
}
/*
* Write ORIGIN to the output stream.
*/