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From Ted Yu <yuzhih...@gmail.com>
Subject Re: regions not balanced, CDH4.1.2
Date Tue, 04 Dec 2012 19:35:08 GMT
Thanks for the information.

Please turn on per-table load balancing and tell us what it looks like.

On Tue, Dec 4, 2012 at 11:32 AM, Norbert Burger <norbert.burger@gmail.com>wrote:

> On Tue, Dec 4, 2012 at 2:10 PM, Ted Yu <yuzhihong@gmail.com> wrote:
> > Can you give us a little more detail on how much deviation the region
> > counts on region servers have ?
> >
> > There is a parameter, hbase.regions.slop, with default value of 0.2
> > This parameter allows region count to deviate by certain percentage from
> > average region count.
> >
> > You can tighten the value for this parameter and see if you get better
> > results.
>
> Thanks for the response.  I think this isn't an issue with region slop
> -- I had a table with only ~15 regions, and half of them ended up on
> one region server.  I've since manually rebalanced that table, but
> here's an example from different table [1].
>
> Norbert
>
> [1]
> Regions by Region Server
> Region Server   Region Count
> http://aspen8hdp9.turner.com:60030/     25
> http://aspen8hdp10.turner.com:60030/    25
> http://aspen8hdp16.turner.com:60030/    38
> http://aspen8hdp13.turner.com:60030/    26
> http://aspen8hdp15.turner.com:60030/    26
> http://aspen8hdp12.turner.com:60030/    43
> http://aspen8hdp14.turner.com:60030/    31
> http://aspen8hdp11.turner.com:60030/    42
>

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