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From Norbert Burger <norbert.bur...@gmail.com>
Subject Re: regions not balanced, CDH4.1.2
Date Tue, 04 Dec 2012 19:28:46 GMT
Thanks, Jimmy.  Do you mean the config
"hbase.master.loadbalance.bytable"?  According to [1] and [2], it is
"true" by default.

[1] https://issues.apache.org/jira/secure/attachment/12509174/3373.txt
[2] http://search-hadoop.com/m/M6z7G1PKejw

Norbert

On Tue, Dec 4, 2012 at 2:23 PM, Jimmy Xiang <jxiang@cloudera.com> wrote:
> 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 <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.
>>
>> I will also put the above summary on HBASE-3373.
>>
>> Thanks
>>
>> On Tue, Dec 4, 2012 at 8:42 AM, Norbert Burger <norbert.burger@gmail.com>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
>>>

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