Re: HBase 0.98 CDH 5.2, significant Read degradation

2015-03-14 Thread Serega Sheypak
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 ndimi...@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

Re: HBase 0.98 CDH 5.2, significant Read degradation

2015-03-13 Thread Nick Dimiduk
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,

HBase 0.98 CDH 5.2, significant Read degradation

2015-03-13 Thread Serega Sheypak
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