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From Robert Coli <rc...@eventbrite.com>
Subject Re: Schema disagreement under normal conditions, ALTER TABLE hangs
Date Tue, 26 Nov 2013 19:24:57 GMT
On Mon, Nov 25, 2013 at 6:42 PM, Josh Dzielak <josh@keen.io> wrote:

> Recently we had a strange thing happen. Altering schema (gc_grace_seconds)
> for a column family resulted in a schema disagreement. 3/4 of nodes got it,
> 1/4 didn't. There was no partition at the time, nor was there multiple
> schema updates issued. Going to the nodes with stale schema and trying to
> do the ALTER TABLE there resulted in hanging. We were eventually able to
> get schema agreement by restarting nodes, but both the initial disagreement
> under normal conditions and the hanging ALTER TABLE seem pretty weird. Any
> ideas here? Sound like a bug?
>

Yes, that sounds like a bug. This behavior is less common in 1.2.x than it
was previously, but still happens sometimes. It's interesting that
restarting the affected node helped, in previous versions of "hung schema"
issue, it would survive restart.


> We're on 1.2.8.
>

Unfortunately, unless you have a repro path, it is probably not worth
reporting a JIRA.

=Rob

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