database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-07-07 00:36:50 +03:00
Code Activity

Logical decoding of TRUNCATE

Browse Source 
Add a new WAL record type for TRUNCATE, which is only used when
wal_level >= logical.  (For physical replication, TRUNCATE is already
replicated via SMGR records.)  Add new callback for logical decoding
output plugins to receive TRUNCATE actions.

Author: Simon Riggs <simon@2ndquadrant.com>
Author: Marco Nenciarini <marco.nenciarini@2ndquadrant.it>
Author: Peter Eisentraut <peter.eisentraut@2ndquadrant.com>
Reviewed-by: Petr Jelinek <petr.jelinek@2ndquadrant.com>
Reviewed-by: Andres Freund <andres@anarazel.de>
Reviewed-by: Alvaro Herrera <alvherre@alvh.no-ip.org>
This commit is contained in:
Peter Eisentraut
2018-04-07 11:17:56 -04:00
parent b508a56f2f
commit 5dfd1e5a66
15 changed files with 414 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files

41
src/backend/replication/logical/decode.c
View File

@ -65,6 +65,7 @@ static void DecodeLogicalMsgOp(LogicalDecodingContext *ctx, XLogRecordBuffer *bu
static void DecodeInsert(LogicalDecodingContext *ctx, XLogRecordBuffer *buf);
static void DecodeUpdate(LogicalDecodingContext *ctx, XLogRecordBuffer *buf);
static void DecodeDelete(LogicalDecodingContext *ctx, XLogRecordBuffer *buf);
static void DecodeTruncate(LogicalDecodingContext *ctx, XLogRecordBuffer *buf);
static void DecodeMultiInsert(LogicalDecodingContext *ctx, XLogRecordBuffer *buf);
static void DecodeSpecConfirm(LogicalDecodingContext *ctx, XLogRecordBuffer *buf);
@ -450,6 +451,11 @@ DecodeHeapOp(LogicalDecodingContext *ctx, XLogRecordBuffer *buf)
DecodeDelete(ctx, buf);
break;
case XLOG_HEAP_TRUNCATE:
if (SnapBuildProcessChange(builder, xid, buf->origptr))
DecodeTruncate(ctx, buf);
break;
case XLOG_HEAP_INPLACE:
/*
@ -826,6 +832,41 @@ DecodeDelete(LogicalDecodingContext *ctx, XLogRecordBuffer *buf)
ReorderBufferQueueChange(ctx->reorder, XLogRecGetXid(r), buf->origptr, change);
}
/*
* Parse XLOG_HEAP_TRUNCATE from wal
*/
static void
DecodeTruncate(LogicalDecodingContext *ctx, XLogRecordBuffer *buf)
{
XLogReaderState *r = buf->record;
xl_heap_truncate *xlrec;
ReorderBufferChange *change;
xlrec = (xl_heap_truncate *) XLogRecGetData(r);
/* only interested in our database */
if (xlrec->dbId != ctx->slot->data.database)
return;
/* output plugin doesn't look for this origin, no need to queue */
if (FilterByOrigin(ctx, XLogRecGetOrigin(r)))
return;
change = ReorderBufferGetChange(ctx->reorder);
change->action = REORDER_BUFFER_CHANGE_TRUNCATE;
change->origin_id = XLogRecGetOrigin(r);
if (xlrec->flags & XLH_TRUNCATE_CASCADE)
change->data.truncate.cascade = true;
if (xlrec->flags & XLH_TRUNCATE_RESTART_SEQS)
change->data.truncate.restart_seqs = true;
change->data.truncate.nrelids = xlrec->nrelids;
change->data.truncate.relids = palloc(xlrec->nrelids * sizeof(Oid));
memcpy(change->data.truncate.relids, xlrec->relids,
xlrec->nrelids * sizeof(Oid));
ReorderBufferQueueChange(ctx->reorder, XLogRecGetXid(r),
buf->origptr, change);
}
/*
* Decode XLOG_HEAP2_MULTI_INSERT_insert record into multiple tuplebufs.
*