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From Dhaval Shah <prince_mithi...@yahoo.co.in>
Subject Re: Rebuild HBASE Table to reduce Regions per RS
Date Tue, 14 Jan 2014 17:42:05 GMT
If you can afford downtime for your table, there are ways to do it. You can:
- Merge regions (requires table to be disabled atleast in some older versions and probably
in newer ones too)
- Go brute force by doing an export, truncate, import (this is a little more manageable when
you have a large number of regions). This however is way more resource intensive and will
take longer.

If you can't afford downtime, I would suggest create another table which mirrors this one
and then switch to the new one

Regards,

Dhaval


________________________________
From: Upender Nimbekar <nimbekar.upender@gmail.com>
To: dev@hbase.apache.org; user@hbase.apache.org 
Sent: Tuesday, 14 January 2014 10:21 AM
Subject: Rebuild HBASE Table to reduce Regions per RS


Hi,
Does anyone have any experience rebuidling the HBASE table to reduce the
number of regions. I am currently dealing with a situation where the no. of
regions per RS have gone up quite significantly (500 per RS) and thereby
causing some performance issues. This is how I am thinking of bringing it
down:

increase the hbase.hregion.max.filesize from 500 MB to 2 GB

And the rebuild the HBASE table. I am assuming if after table rebuild, I
should see the no. of regions come down to more than half. I would
basically like to stay within HBASE suggested no. of regions per RS which
is about 50-200.

Please suggest if someone has any experience doing it.

Thanks
UpenĀ  

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