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HBase, mail # user - regions not balanced, CDH4.1.2


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Re: regions not balanced, CDH4.1.2
Jimmy Xiang 2012-12-04, 19:23
In CDH4.1.2, per table region balancing is turned off by default.

You can change the configuration to turn it on.

Thanks,
Jimmy

On Tue, Dec 4, 2012 at 11:10 AM, Ted Yu <[EMAIL PROTECTED]> 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.
>
> I will also put the above summary on HBASE-3373.
>
> Thanks
>
> On Tue, Dec 4, 2012 at 8:42 AM, Norbert Burger <[EMAIL PROTECTED]>wrote:
>
>> We upgraded to CDH4.1.2 (contains HBASE-3373) in one of our
>> environments.  After filling that environment with data, I was
>> surprised to see that regions were not balanced across regionservers
>> at the table level.  We have restarted all regionservers at least once
>> here.
>>
>> In [1], I see Stack's reference to temporarily adding
>> "hbase.master.startup.retainassign=false" and restarting nodes.  Is
>> this a necessary step on the path to region balancing nirvana?
>>
>> Norbert
>>
>> [1] http://search-hadoop.com/m/MQSPEyUQIv1
>>