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Re: Wide area replication postgres 9.1.6 slon 2.1.2 large table failure.

From: "Kevin Grittner" <kgrittn(at)mail(dot)com>
To: "Tory M Blue" <tmblue(at)gmail(dot)com>,pgsql-hackers(at)postgresql(dot)org
Subject: Re: Wide area replication postgres 9.1.6 slon 2.1.2 large table failure.
Date: 2013-01-13 22:49:38
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Lists: pgsql-hackers
Tory M Blue wrote:

> Postgres 9.1.4 slon 2.1.1
> -and-
> Postgres 9.1.6 slon 2.1.2

If it is possible, it never hurts to rule out bugs for which fixes
are already available in production releases:

> Symptoms, slon immediately dies after transferring the biggest table in the
> set

Dies? What does that mean, exactly?

> 1224459-2013-01-11 14:21:10 PST CONFIG remoteWorkerThread_1: 5760.913
> seconds to copy table "cls"."listings"
> 1224560-2013-01-11 14:21:10 PST CONFIG remoteWorkerThread_1: copy table
> "cls"."customers"
> 1224642-2013-01-11 14:21:10 PST CONFIG remoteWorkerThread_1: Begin COPY of
> table "cls"."customers"
> 1224733-2013-01-11 14:21:10 PST ERROR remoteWorkerThread_1: "select
> "_admissioncls".copyFields(8);" <--- this has the proper data
> 1224827:2013-01-11 14:21:10 PST WARN remoteWorkerThread_1: data copy for
> set 1 failed 1 times - sleep 15 seconds

What, specifically, can cause those that set of messages from

> I get no errors in the postgres logs, there is no network disconnect and
> since I can do a copy over the wire that completes, I'm at a loss. I don't
> know what to look at, what to look for or what to do. Obviously this is
> the wrong place to slon issues.

It is hard to make much of a guess without more data. I recommend
looking over this page for ideas:

... but in particular I think grabbing the contents of
pg_stat_activity (using a superuser login) and pg_locks as soon as
you feel it has died will be helpful.


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