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From Alex Popescu <al...@datastax.com>
Subject Re: Increased Cassandra connection latency
Date Fri, 30 May 2014 01:20:07 GMT
Also using the latest version of the driver (1.0.7) is always a good idea
just to make sure you are not hitting issues that have already been
addressed.


On Thu, May 29, 2014 at 12:33 AM, Aaron Morton <aaron@thelastpickle.com>
wrote:

> You’ll need to provide some more information such as:
>
> * Do you have monitoring on the cassandra cluster that shows the request
> latency ? Data Stax OpsCentre is  good starting point.
>
> * Is compaction keeping up ? Check with nodetool compactionstats
>
> * Is the GCInspector logging about long running ParNew ? (it only logs
> when it’s longer than 200ms)
>
> Cheers
> Aaron
>
>
>     -----------------
> Aaron Morton
> New Zealand
> @aaronmorton
>
> Co-Founder & Principal Consultant
> Apache Cassandra Consulting
> http://www.thelastpickle.com
>
> On 23/05/2014, at 10:35 pm, Alexey Sverdelov <
> alexey.sverdelov@googlemail.com> wrote:
>
> Hi all,
>
> I've noticed increased latency on our tomcat REST-service (average 30ms,
> max > 2sec). We are using Cassandra 1.2.16 with official DataStax Java
> driver v1.0.3.
>
> Our setup:
>
> * 2 DCs
> * each DC: 7 nodes
> * RF=5
> * Leveled compaction
>
> After cassandra restart on all nodes, the latencies are alright again
> (average < 5ms, max 50ms).
>
> Any thoughts are greatly appreciated.
>
> Thanks,
> Alexey
>
>
>


-- 

:- a)


Alex Popescu
Sen. Product Manager @ DataStax
@al3xandru

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