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Date: Wed, 23 Jan 2013 07:26:58 -0500
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Subject: Re: HBase split policy
From: Jean-Marc Spaggiari <jean-marc@spaggiari.org>
To: user@hbase.apache.org
Content-Type: text/plain; charset=UTF-8

Hi Anoop,

I ran another major_compact and the split is now totally done.

Question is, why has it not been done initially when I ran the first
major_compact. No idea.

I will re-merge the file into one single region and re-compact to see
if I can reproduce that.

JM

2013/1/23, Anoop Sam John <anoopsj@huawei.com>:
>>What will trigger the split?
> The things which can trigger a split
> 1. Explicit split call from the client side using admin API
> 2. A memstore flush
> 3. A compaction
>
> So even though there is no write operations happening on the region (no
> flushes) still a compaction performed for that region can trigger split.
> May be in your case compaction happened for some of the regions and resulted
> in split...
>
> -Anoop-
> ________________________________________
> From: Jean-Marc Spaggiari [jean-marc@spaggiari.org]
> Sent: Wednesday, January 23, 2013 8:09 AM
> To: user@hbase.apache.org
> Subject: Re: HBase split policy
>
> Another related question.
>
> What will trigger the split?
>
> I mean, I merge all the regions in a single one, split that in 4 2.5GB
> regions, alter it to set maxsize to 300MB and enable the table. I
> don't do anything. No put, no get. What will trigger the regions
> split?
>
> I have one small table, about 1.2GB with 8M lines. I merged it in a
> single region, and setup the maxsize to the 12MB. It got almost
> split... All the regions got split except one.
>
> Here is the screenshot:
> http://imageshack.us/photo/my-images/834/hannibalb.png/
>
> It's not the first region, not the last. There is nothing specific
> with this region, and it's not getting split.
>
> Any idea why, and how I can trigger the split without putting any data
> into the date?
>
> Thanks,
>
> JM