Re: ALTER statement hanging - Mailing list pgsql-general

From Selim Tuvi
Subject Re: ALTER statement hanging
Date
Msg-id D702486C6BC79C40A9C6FF4F0315ABC035966A@mailbox09.lucas.alllucas.com
Whole thread Raw
In response to Re: ALTER statement hanging  (Selim Tuvi <stuvi@ilm.com>)
List pgsql-general
I stopped the other two nodes and restarted the instance and pg_locks shows the following.

deliver=# select * from pg_locks;
  locktype  | database | relation | page | tuple | virtualxid | transactionid | classid | objid | objsubid | virtualtransaction |  pid  |      mode       | granted |
fastpath
------------+----------+----------+------+-------+------------+---------------+---------+-------+----------+--------------------+-------+-----------------+---------+-
---------
 relation   |   533136 |    11189 |      |       |            |               |         |       |          | 5/68               | 10229 | AccessShareLock | t       |
t
 virtualxid |          |          |      |       | 5/68       |               |         |       |          | 5/68               | 10229 | ExclusiveLock   | t       |
t
(2 rows)

-Selim


From: pgsql-general-owner@postgresql.org [pgsql-general-owner@postgresql.org] on behalf of Selim Tuvi [stuvi@ilm.com]
Sent: Thursday, December 03, 2015 4:31 PM
To: pgsql-general@postgresql.org
Subject: Re: [GENERAL] ALTER statement hanging

And I tried running the same statement on another node, while one node was running it and I got the following:

ERROR:  database is locked against ddl by another node
HINT:  Node (6223770712502831127,1,16389) in the cluster is already performing DDL

Terminating the statement in one node and running it on another results in a hang as well.

-Selim


From: Selim Tuvi
Sent: Thursday, December 03, 2015 4:03 PM
To: pgsql-general@postgresql.org
Subject: BDR: ALTER statement hanging

Hi, I am running a three node BDR cluster. BDR version is 0.9.3. Postgres version is 9.4.5.

With 0.9.2, I used to be able to issue ALTER statements using psql and it would go through. This time it is just hanging. The statement is this:

alter table pts alter column shot drop not null;

I also tried to add a column but that hangs as well:

alter table pts add column shot_tmp text;

Thanks
-Selim

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