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Add option to control snapshot export to CREATE_REPLICATION_SLOT

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We used to export snapshots unconditionally in CREATE_REPLICATION_SLOT
in the replication protocol, but several upcoming patches want more
control over what happens.

Suppress snapshot export in pg_recvlogical, which neither needs nor can
use the exported snapshot.  Since snapshot exporting can fail this
improves reliability.

This also paves the way for allowing the creation of replication slots
on standbys, which cannot export snapshots because they cannot allocate
new XIDs.

Author: Petr Jelinek <petr.jelinek@2ndquadrant.com>
This commit is contained in:
Peter Eisentraut
2017-03-14 17:13:56 -04:00
parent 7150402655
commit eb4da3e380
10 changed files with 141 additions and 26 deletions
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6
src/backend/commands/subscriptioncmds.c
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@ -314,7 +314,11 @@ CreateSubscription(CreateSubscriptionStmt *stmt, bool isTopLevel)
PG_TRY();
{
walrcv_create_slot(wrconn, slotname, false, &lsn);
/*
* Create permanent slot for the subscription. We won't use the
* initial snapshot for anything, so no need to export it.
*/
walrcv_create_slot(wrconn, slotname, false, false, &lsn);
ereport(NOTICE,
(errmsg("created replication slot \"%s\" on publisher",
slotname)));