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From Carlos Alonso <i...@mrcalonso.com>
Subject Re: Consistency Issues
Date Thu, 01 Oct 2015 09:10:58 GMT
Hi Stephen.

The UnknownColumnFamilyException made me thought of a possible schema
disagreement in which any of your nodes has a different version and
therefore you cannot reach quorum?

Can you run nodetool describecluster and see if all nodes have the same
schema versions?

Cheers!

Carlos Alonso | Software Engineer | @calonso <https://twitter.com/calonso>

On 1 October 2015 at 09:49, Walsh, Stephen <Stephen.Walsh@aspect.com> wrote:

> If you’re looking for the clean-up of the old gen in the jvm heap, it
> doesn’t happen.
>
> We have a new gen turning 15 times before its pushed to old gen.
>
> Seems all our data only has a TTL of 10 seconds – very little data is sent
> to the old gen.
>
>
>
> Add in heap size of 8GB with a new gen size of 2GB, I don’t think gc is
> our issue.
>
>
>
>
>
> I’m more worried about error messages in the Cassandra log file that state.
>
>
>
>
>
> UnknownColumnFamilyException reading from socket; closing
>
> org.apache.cassandra.db.UnknownColumnFamilyException: Couldn't find
> cfId=cf411b50-6785-11e5-a435-e7be20c92086
>
>
>
> and
>
>
>
> cassandra OutboundTcpConnection.java:313 - error writing to Connection.
>
>
>
>
>
>
>
> But I really need to understand this best practice that was mentioned (on
> number of CF’s) by Jack Krupansky.
>
> Anyone more information on this?
>
>
>
>
>
> Many thanks for all your help guys keep it coming J
>
> Steve
>
>
>
> *From:* Ricardo Sancho [mailto:sancho.ricardo@gmail.com]
> *Sent:* 01 October 2015 09:39
> *To:* user@cassandra.apache.org
> *Subject:* RE: Consistency Issues
>
>
>
> Can you tell us how much time your gcs are taking?
> Do you see any especially long ones?
>
> On 1 Oct 2015 09:37, "Walsh, Stephen" <Stephen.Walsh@aspect.com> wrote:
>
> There is no load balancer in front of Cassandra,  it’s in front of our
> application.
>
> Everyone seems hung up on this point? But it’s not the root causing of the
> inconsistency issue.
>
>
>
> Can anyone verify the best practice for number of CF’s?
>
>
>
>
>
> *From:* Robert Coli [mailto:rcoli@eventbrite.com]
> *Sent:* 30 September 2015 18:45
> *To:* user@cassandra.apache.org
> *Subject:* Re: Consistency Issues
>
>
>
> On Wed, Sep 30, 2015 at 9:06 AM, Walsh, Stephen <Stephen.Walsh@aspect.com>
> wrote:
>
>
>
> We never had these issue with our first run. Its only when we added
> another 25% of writes.
>
>
>
> As Jack said, you are probably pushing your GC over a threshold, leading
> to long pause times and inability to meet quorum.
>
>
>
> As Sebastian said, you probably shouldn't need a load balancer in front of
> Cassandra.
>
>
>
> =Rob
>
>
>
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