Re: [PATCH] Use indexes on the subscriber when REPLICA IDENTITY is full on the publisher - Mailing list pgsql-hackers

From Önder Kalacı
Subject Re: [PATCH] Use indexes on the subscriber when REPLICA IDENTITY is full on the publisher
Date
Msg-id CACawEhXMz5fLGM4DVh-qqv7CejYG=0S9j6cQQtuqn9P3xKvk_g@mail.gmail.com
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In response to RE: [PATCH] Use indexes on the subscriber when REPLICA IDENTITY is full on the publisher  ("shiy.fnst@fujitsu.com" <shiy.fnst@fujitsu.com>)
List pgsql-hackers
Hi Shi Yu, all


Thanks for updating the patch. Here are some comments on v33-0001 patch.

1.
+       if (RelationReplicaIdentityFullIndexScanEnabled(localrel) &&
+               remoterel->replident == REPLICA_IDENTITY_FULL)

RelationReplicaIdentityFullIndexScanEnabled() is introduced in 0002 patch, so
the call to it should be moved to 0002 patch I think.

Ah, sure, a rebase issue, fixed in v34
 

2.
+#include "optimizer/cost.h"

Do we need this in the latest patch? I tried and it looks it could be removed
from src/backend/replication/logical/relation.c.

Hmm, probably an artifact of the initial versions of the patch where we needed some
costing functionality.
 

3.
+# now, create a unique index and set the replica
+$node_publisher->safe_psql('postgres',
+       "CREATE UNIQUE INDEX test_replica_id_full_unique ON test_replica_id_full(x);");
+$node_subscriber->safe_psql('postgres',
+       "CREATE UNIQUE INDEX test_replica_id_full_unique ON test_replica_id_full(x);");
+

Should the comment be "now, create a unique index and set the replica identity"?

yes, fixed
 

4.
+$node_publisher->safe_psql('postgres',
+       "ALTER TABLE test_replica_id_full REPLICA IDENTITY USING INDEX test_replica_id_full_unique;");
+$node_subscriber->safe_psql('postgres',
+       "ALTER TABLE test_replica_id_full REPLICA IDENTITY USING INDEX test_replica_id_full_unique;");
+
+# wait for the synchronization to finish
+$node_subscriber->wait_for_subscription_sync;

There's no new tables to need to be synchronized here, should we remove the call
to wait_for_subscription_sync?

right, probably a copy & paste typo, thanks for spotting.


I'll attach v34 with the next e-mail given the comments here only touch small parts
of the patch.



Thanks,
Onder KALACI  
 


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