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From Qiang Tian <tian...@gmail.com>
Subject Re: Too many non-used regions
Date Tue, 14 Oct 2014 08:50:36 GMT
region unbalanced?
which hbase release?


On Tue, Oct 14, 2014 at 3:39 PM, Serega Sheypak <serega.sheypak@gmail.com>
wrote:

> Hi, we have 10 nodes cluster with 10HDD, 256 GB RAM and 10HDD 3TB each.
> Suddenly we met write perfomance issues.
>
> Our workload is:
> 1. We have 100+ region table for write load. It has constant set of keys
> (~6* 10^7) and we write "updates". No versions or stuff like that
> 2. We have several read-only tables, theirs size could be from 1 egion up
> to 256 regions.
> 3. We have several non-used tables  theirs size could be from 1 region up
> to 256 regions. These tables are previous versions of read-only tables.
>
> Right now each RegionServer serves >100 regions, but only half of them are
> active. Really nothing changed for the last few weeks, we got more non-used
> tables, but quantity on active read-only tables is the same, single
> wirte-only table dodn't get more bytes to write.
>
> Can big count of non-used(!!!) regions affect write/read perfomance for
> tables which are in use.
>

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