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From schubert zhang <zson...@gmail.com>
Subject Re: HDFS unbalance issue. (HBase over HDFS)
Date Thu, 26 Mar 2009 03:07:43 GMT
Tanks Andrew and Billy.
I think the subject of this mail thread is not appropriate, it may not be a
balance issue.
The problem seems the block deleting scheduler in HDFS.

Last night(timezone:+8), I slow down my application, and this morning, I
found almost all garbage blocks are deleted.
Here is the current blocks number of each datanode:
node1: 10651
node2: 10477
node3: 12185
node4: 11607
node5: 14000

It seems fine.
But I want to study the code of HDFS and make clear the policy of deleting
blocks on datanodes. If anyone in the hadoop community can  give me some


On Thu, Mar 26, 2009 at 7:55 AM, Andrew Purtell <apurtell@apache.org> wrote:

> > From: schubert zhang <zsongbo@gmail.com>
> > From another point of view, I think HBase cannot control to
> > delete blocks on which node, it would just delete files, and
> > HDFS delete blocks where the blocks locating.
> Yes, that is exactly correct.
> Best regards,
>   - Andy

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