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Logical replication support for TRUNCATE

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Update the built-in logical replication system to make use of the
previously added logical decoding for TRUNCATE support.  Add the
required truncate callback to pgoutput and a new logical replication
protocol message.

Publications get a new attribute to determine whether to replicate
truncate actions.  When updating a publication via pg_dump from an older
version, this is not set, thus preserving the previous behavior.

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 11:24:53 -04:00
parent 5dfd1e5a66
commit 039eb6e92f
19 changed files with 572 additions and 111 deletions
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55
src/backend/replication/logical/proto.c
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@@ -26,6 +26,9 @@
*/
#define LOGICALREP_IS_REPLICA_IDENTITY 1
#define TRUNCATE_CASCADE (1<<0)
#define TRUNCATE_RESTART_SEQS (1<<1)
static void logicalrep_write_attrs(StringInfo out, Relation rel);
static void logicalrep_write_tuple(StringInfo out, Relation rel,
HeapTuple tuple);
@@ -292,6 +295,58 @@ logicalrep_read_delete(StringInfo in, LogicalRepTupleData *oldtup)
return relid;
}
/*
* Write TRUNCATE to the output stream.
*/
void
logicalrep_write_truncate(StringInfo out,
int nrelids,
Oid relids[],
bool cascade, bool restart_seqs)
{
int i;
uint8 flags = 0;
pq_sendbyte(out, 'T'); /* action TRUNCATE */
pq_sendint32(out, nrelids);
/* encode and send truncate flags */
if (cascade)
flags |= TRUNCATE_CASCADE;
if (restart_seqs)
flags |= TRUNCATE_RESTART_SEQS;
pq_sendint8(out, flags);
for (i = 0; i < nrelids; i++)
pq_sendint32(out, relids[i]);
}
/*
* Read TRUNCATE from stream.
*/
List *
logicalrep_read_truncate(StringInfo in,
bool *cascade, bool *restart_seqs)
{
int i;
int nrelids;
List *relids = NIL;
uint8 flags;
nrelids = pq_getmsgint(in, 4);
/* read and decode truncate flags */
flags = pq_getmsgint(in, 1);
*cascade = (flags & TRUNCATE_CASCADE) > 0;
*restart_seqs = (flags & TRUNCATE_RESTART_SEQS) > 0;
for (i = 0; i < nrelids; i++)
relids = lappend_oid(relids, pq_getmsgint(in, 4));
return relids;
}
/*
* Write relation description to the output stream.
*/