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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] [Issue Comment Edited] (HBASE-3779) Allow split regions to be placed on different region servers
Date Thu, 14 Apr 2011 17:39:06 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13019931#comment-13019931
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Jean-Daniel Cryans edited comment on HBASE-3779 at 4/14/11 5:38 PM:
--------------------------------------------------------------------

This shouldn't be done inline with the split tho as it will take that whole key space offline
for even longer. The way it's currently working is actually an optimization in that regard.

What could be done tho is moving the region with the less load after the dust settles but
even then, you might want a different behavior for the heavy import scenario and the realtime
serving one. In the former, if the import is even across the regions, the region servers should
all be splitting as much as the others so moving regions does no good.

      was (Author: jdcryans):
    This shouldn't be done inline with the split tho as it will take that whole key space
offline for even longer. The way it's currently is actually an optimization in that regard.

What could be done tho is moving the region with the less load after the dust settles but
even then, you might want a different behavior for the heavy import scenario and the realtime
serving one. In the former, if the import is even across the regions, the region servers should
all be splitting as much as the others so moving regions does no good.
  
> Allow split regions to be placed on different region servers
> ------------------------------------------------------------
>
>                 Key: HBASE-3779
>                 URL: https://issues.apache.org/jira/browse/HBASE-3779
>             Project: HBase
>          Issue Type: Improvement
>          Components: master
>    Affects Versions: 0.90.2
>            Reporter: Ted Yu
>            Assignee: Ted Yu
>
> Currently daughter regions are placed on the same region server where the parent region
was.
> Stanislav Barton mentioned the idea that load information should be considered when placing
the daughter regions.
> The rationale is that the daughter regions tend to receive more writes. So it would be
beneficial to place at least one daughter region on a different region server.

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