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Zookeeper >> mail # user >> determining ZK latency issues


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Jun Rao 2013-08-08, 17:37
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Re: determining ZK latency issues
Do you see fsync() warnings in your ZooKeeper log? It could be disk writes
taking too long.

Best Regards,
Martin Kou
On Thu, Aug 8, 2013 at 10:37 AM, Jun Rao <[EMAIL PROTECTED]> wrote:

> Hi,
>
> We have a 3-node ZK cluster running 3.3.4 that are experiencing high
> latency. From "stat", we saw avg latency to be 300-400ms consistently.
> Outstanding requests jumps to ~600 from time to time. However, the server's
> I/O and CPU are both low. If I start a new ZK client and do a few writes,
> the observed response time in the client is also low (1ms).
>
> What's the best way to figure out why the reported latency in ZK server is
> high? Also, are  min/avg/max latency computed on a rolling time window?
>
> Thanks,
>
> Jun
>
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Neha Narkhede 2013-08-08, 18:40
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Thawan Kooburat 2013-08-09, 02:35
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Martin Kou 2013-08-09, 09:31
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB