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From Nick Dimiduk <ndimi...@gmail.com>
Subject Re: HBase 0.98 CDH 5.2, significant Read degradation
Date Fri, 13 Mar 2015 17:44:23 GMT
HBase is telling you that writes to those datanodes are slow. Is it the
same host names over and over? Probably they have high system load, a bad
or dying disk, bad or dying network adapter, &c. Basically HBase is giving
you a hint to go diagnose your cluster.

-n

On Fri, Mar 13, 2015 at 2:44 AM, Serega Sheypak <serega.sheypak@gmail.com>
wrote:

> Hi, finally I met HBase perfomance problems :(
> I see this message:
> org.apache.hadoop.hbase.regionserver.wal.FSHLog
>
> Slow sync cost: 345 ms, current pipeline: []
>
> in log file
> sometimes [] contains actual addresses of my datanodes.
> What are the steps to undestand why HBase is so slow.
> I have 7RS and 3K reads per second and 500 writes per second. Requests are
> evenly distributed across cluster since I use hash for keys.
>

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