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Add support for temporary replication slots

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This allows creating temporary replication slots that are removed
automatically at the end of the session or on error.

From: Petr Jelinek <petr.jelinek@2ndquadrant.com>
This commit is contained in:
Peter Eisentraut
2016-12-08 12:00:00 -05:00
parent e7f051b8f9
commit a924c327e2
18 changed files with 237 additions and 51 deletions
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28
src/backend/replication/walsender.c
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@@ -266,6 +266,8 @@ WalSndErrorCleanup(void)
if (MyReplicationSlot != NULL)
ReplicationSlotRelease();
ReplicationSlotCleanup();
replication_active = false;
if (walsender_ready_to_stop)
proc_exit(0);
@@ -796,18 +798,22 @@ CreateReplicationSlot(CreateReplicationSlotCmd *cmd)
if (cmd->kind == REPLICATION_KIND_PHYSICAL)
{
ReplicationSlotCreate(cmd->slotname, false, RS_PERSISTENT);
ReplicationSlotCreate(cmd->slotname, false,
cmd->temporary ? RS_TEMPORARY : RS_PERSISTENT);
}
else
{
CheckLogicalDecodingRequirements();
/*
* Initially create the slot as ephemeral - that allows us to nicely
* handle errors during initialization because it'll get dropped if
* this transaction fails. We'll make it persistent at the end.
* Initially create persisent slot as ephemeral - that allows us to
* nicely handle errors during initialization because it'll get
* dropped if this transaction fails. We'll make it persistent at the
* end. Temporary slots can be created as temporary from beginning as
* they get dropped on error as well.
*/
ReplicationSlotCreate(cmd->slotname, true, RS_EPHEMERAL);
ReplicationSlotCreate(cmd->slotname, true,
cmd->temporary ? RS_TEMPORARY : RS_EPHEMERAL);
}
initStringInfo(&output_message);
@@ -841,15 +847,18 @@ CreateReplicationSlot(CreateReplicationSlotCmd *cmd)
/* don't need the decoding context anymore */
FreeDecodingContext(ctx);
ReplicationSlotPersist();
if (!cmd->temporary)
ReplicationSlotPersist();
}
else if (cmd->kind == REPLICATION_KIND_PHYSICAL && cmd->reserve_wal)
{
ReplicationSlotReserveWal();
/* Write this slot to disk */
ReplicationSlotMarkDirty();
ReplicationSlotSave();
/* Write this slot to disk if it's permanent one. */
if (!cmd->temporary)
ReplicationSlotSave();
}
snprintf(xpos, sizeof(xpos), "%X/%X",
@@ -933,9 +942,6 @@ CreateReplicationSlot(CreateReplicationSlotCmd *cmd)
pq_endmessage(&buf);
/*
* release active status again, START_REPLICATION will reacquire it
*/
ReplicationSlotRelease();
}