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From Serega Sheypak <serega.shey...@gmail.com>
Subject Re: HBase 0.98 CDH 5.2, significant Read degradation
Date Sat, 14 Mar 2015 09:06:11 GMT
We are using cheap HW to run our HBase. Problem is in toshiba disks.
Thanks!


2015-03-13 20:44 GMT+03:00 Nick Dimiduk <ndimiduk@gmail.com>:

> 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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