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From Ted Yu <yuzhih...@gmail.com>
Subject Re: Very high read rate in a single RegionServer
Date Sun, 25 Jan 2015 02:09:14 GMT
I assume you have read http://hbase.apache.org/book.html#perf.reading

What hbase release are you using ?

Does this region server host hbase:meta (assuming 0.98 release is used) ?


On Sat, Jan 24, 2015 at 5:15 PM, Pun Intended <punintendedyo@gmail.com>

> Hello,
> I have noticed lately that my apps started running longer. The longest
> running tasks seem all to be requesting data from a single region server.
> That region server read rate is very high in comparison to the read rate of
> all the other region servers (1000reqs/sec vs 4-5 reqs/sec elsewhere). That
> region server has about the same number of regions as all the rest: 26-27
> regions. Number of store files, total region size, everything else on the
> region server seems ok and in the same ranges as the rest of the region
> servers. The keys should be evenly distributed - randomly generated
> 38-digit numbers. I am doing a simple Hbase scan from all my MR jobs.
> I'd appreciate any suggestions on what to look into it or if you have any
> ideas how I can solve this issue.
> Thanks!

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