hbase-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
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.


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

> 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.

  • Unnamed multipart/alternative (inline, None, 0 bytes)
View raw message