Re: ALTER statement hanging

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(at)postgresql(dot)org [pgsql-general-owner(at)postgresql(dot)org] on behalf of Selim Tuvi [stuvi(at)ilm(dot)com]
Sent: Thursday, December 03, 2015 4:31 PM
To: pgsql-general(at)postgresql(dot)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(at)postgresql(dot)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