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Logical decoding of TRUNCATE

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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

10
src/include/replication/output_plugin.h
View File

@@ -61,6 +61,15 @@ typedef void (*LogicalDecodeChangeCB) (struct LogicalDecodingContext *ctx,
Relation relation,
ReorderBufferChange *change);
/*
* Callback for every TRUNCATE in a successful transaction.
*/
typedef void (*LogicalDecodeTruncateCB) (struct LogicalDecodingContext *ctx,
ReorderBufferTXN *txn,
int nrelations,
Relation relations[],
ReorderBufferChange *change);
/*
* Called for every (explicit or implicit) COMMIT of a successful transaction.
*/
@@ -98,6 +107,7 @@ typedef struct OutputPluginCallbacks
LogicalDecodeStartupCB startup_cb;
LogicalDecodeBeginCB begin_cb;
LogicalDecodeChangeCB change_cb;
LogicalDecodeTruncateCB truncate_cb;
LogicalDecodeCommitCB commit_cb;
LogicalDecodeMessageCB message_cb;
LogicalDecodeFilterByOriginCB filter_by_origin_cb;

24
src/include/replication/reorderbuffer.h
View File

@@ -59,7 +59,8 @@ enum ReorderBufferChangeType
REORDER_BUFFER_CHANGE_INTERNAL_COMMAND_ID,
REORDER_BUFFER_CHANGE_INTERNAL_TUPLECID,
REORDER_BUFFER_CHANGE_INTERNAL_SPEC_INSERT,
REORDER_BUFFER_CHANGE_INTERNAL_SPEC_CONFIRM
REORDER_BUFFER_CHANGE_INTERNAL_SPEC_CONFIRM,
REORDER_BUFFER_CHANGE_TRUNCATE
};
/*
@@ -99,6 +100,18 @@ typedef struct ReorderBufferChange
ReorderBufferTupleBuf *newtuple;
} tp;
/*
* Truncate data for REORDER_BUFFER_CHANGE_TRUNCATE representing
* one set of relations to be truncated.
*/
struct
{
Size nrelids;
bool cascade;
bool restart_seqs;
Oid *relids;
} truncate;
/* Message with arbitrary data. */
struct
{
@@ -283,6 +296,14 @@ typedef void (*ReorderBufferApplyChangeCB) (
Relation relation,
ReorderBufferChange *change);
/* truncate callback signature */
typedef void (*ReorderBufferApplyTruncateCB) (
ReorderBuffer *rb,
ReorderBufferTXN *txn,
int nrelations,
Relation relations[],
ReorderBufferChange *change);
/* begin callback signature */
typedef void (*ReorderBufferBeginCB) (
ReorderBuffer *rb,
@@ -328,6 +349,7 @@ struct ReorderBuffer
*/
ReorderBufferBeginCB begin;
ReorderBufferApplyChangeCB apply_change;
ReorderBufferApplyTruncateCB apply_truncate;
ReorderBufferCommitCB commit;
ReorderBufferMessageCB message;