request to back port HBASE-3609 to 0.90.3

[Ted Yu <yu...@gmail.com>]

Hi:
See feedback from Stan about the changes from HBASE-3609. I think other
hbase users would need this feature as well.

BTW the missing request per region info was due to code difference between
0.90.2 and trunk.
If we decide to back port, I can pull in relevant changes as well.

Cheers

---------- Forwarded message ----------
From: Stanislav Barton <st...@gmail.com>
Date: Fri, Apr 22, 2011 at 8:29 AM
Subject: Re: question about region assignment
To: Ted Yu <yu...@gmail.com>


Hey Ted,

I got back to the latest version of HBase. I am running the latest jar
you have provided me (Compiled: Wed Apr 13 15:19:40 PDT 2011, tyu). I
can say, that the region distribution works much better. I can see in
the per table region distribution info than even though the numbers
are not perfectly balanced, the regions get distributed over all
available RSs. Though I can't  say anything the distribution of hot
vs. cold regions for the most accessed table, because the requests
column is empty all the time in the table's detail page. I noticed in
the blog, that you suggested (upon my mentioning) using the traffic
info for further distribution of the regions. The request histogram
would be of great help in this (per region), together with the
particular data location in HDFS, this could be an input to a robust
load balancing algorithm.

Is the request per region info missing in the table detail page (in my
version) a bug?

Stan