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From Ted Yu <yuzhih...@gmail.com>
Subject Re: region number, region merge and performance
Date Fri, 14 Mar 2014 14:43:22 GMT
For online merge of regions, please take a look at HBASE-7403

Cheers


On Fri, Mar 14, 2014 at 6:18 AM, Libo Yu <yu_libo@hotmail.com> wrote:

> Hi all,
>
> Because we have used the current time stamp in the key, as time goes on,
> we have
> more than more regions. After TTL expires, many of regions are empty or
> almost
> empty. So currently, our region servers have many regions on them but only
> a small
> number of them are active (receive read/write requests).
> So my questions are:
>
> 1 How does the number of region impact the performance? What I can think
> of is that
> MSLAB is enabled, that will waste a lot memory.
>
> 2 I did some search. Hbase has utilities for merge regions and some people
> suggest to
> recreate the table and reload the table. But if I want to merge regions
> for all the entities
> on my cluster automatically,  what is the best way to do it?
>
> Thanks,
>
> Linlin
>
>
>
>

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