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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
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58
contrib/test_decoding/test_decoding.c
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@ -52,6 +52,10 @@ static void pg_decode_commit_txn(LogicalDecodingContext *ctx,
static void pg_decode_change(LogicalDecodingContext *ctx,
ReorderBufferTXN *txn, Relation rel,
ReorderBufferChange *change);
static void pg_decode_truncate(LogicalDecodingContext *ctx,
ReorderBufferTXN *txn,
int nrelations, Relation relations[],
ReorderBufferChange *change);
static bool pg_decode_filter(LogicalDecodingContext *ctx,
RepOriginId origin_id);
static void pg_decode_message(LogicalDecodingContext *ctx,
@ -74,6 +78,7 @@ _PG_output_plugin_init(OutputPluginCallbacks *cb)
cb->startup_cb = pg_decode_startup;
cb->begin_cb = pg_decode_begin_txn;
cb->change_cb = pg_decode_change;
cb->truncate_cb = pg_decode_truncate;
cb->commit_cb = pg_decode_commit_txn;
cb->filter_by_origin_cb = pg_decode_filter;
cb->shutdown_cb = pg_decode_shutdown;
@ -480,6 +485,59 @@ pg_decode_change(LogicalDecodingContext *ctx, ReorderBufferTXN *txn,
OutputPluginWrite(ctx, true);
}
static void
pg_decode_truncate(LogicalDecodingContext *ctx, ReorderBufferTXN *txn,
int nrelations, Relation relations[], ReorderBufferChange *change)
{
TestDecodingData *data;
MemoryContext old;
int i;
data = ctx->output_plugin_private;
/* output BEGIN if we haven't yet */
if (data->skip_empty_xacts && !data->xact_wrote_changes)
{
pg_output_begin(ctx, data, txn, false);
}
data->xact_wrote_changes = true;
/* Avoid leaking memory by using and resetting our own context */
old = MemoryContextSwitchTo(data->context);
OutputPluginPrepareWrite(ctx, true);
appendStringInfoString(ctx->out, "table ");
for (i = 0; i < nrelations; i++)
{
if (i > 0)
appendStringInfoString(ctx->out, ", ");
appendStringInfoString(ctx->out,
quote_qualified_identifier(get_namespace_name(relations[i]->rd_rel->relnamespace),
NameStr(relations[i]->rd_rel->relname)));
}
appendStringInfoString(ctx->out, ": TRUNCATE:");
if (change->data.truncate.restart_seqs
|| change->data.truncate.cascade)
{
if (change->data.truncate.restart_seqs)
appendStringInfo(ctx->out, " restart_seqs");
if (change->data.truncate.cascade)
appendStringInfo(ctx->out, " cascade");
}
else
appendStringInfoString(ctx->out, " (no-flags)");
MemoryContextSwitchTo(old);
MemoryContextReset(data->context);
OutputPluginWrite(ctx, true);
}
static void
pg_decode_message(LogicalDecodingContext *ctx,
ReorderBufferTXN *txn, XLogRecPtr lsn, bool transactional,