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From "Jim Kellerman (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-71) [hbase] Master should rebalance region assignments periodically
Date Thu, 03 Apr 2008 17:04:25 GMT

    [ https://issues.apache.org/jira/browse/HBASE-71?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12585191#action_12585191
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Jim Kellerman commented on HBASE-71:
------------------------------------

Sorry, couple of more nits. Unfortunately Eclipse does not reveal them all at once, but as
others are fixed, more appear. Hopefully these are the last. Will run regression suite after
my run for 0.1.1 completes, since these few comment changes are not going to affect the results.

ProcessRegionClose constructor is missing @param master in javadoc

RegionManager:
- regionsBeingReassigned is never read. Is it necessary.
- line 231: unnecessary check for null
- waitForMetaRegionsOrClose does not throw IOException, can be removed. No @return javadoc
- createRegion no @throws in javadoc
- addMetaRegionToScan no @throws in javadoc

MiniHBaseCluster
- no @throws in javadoc for constructor

> [hbase] Master should rebalance region assignments periodically
> ---------------------------------------------------------------
>
>                 Key: HBASE-71
>                 URL: https://issues.apache.org/jira/browse/HBASE-71
>             Project: Hadoop HBase
>          Issue Type: Improvement
>          Components: master
>            Reporter: Bryan Duxbury
>            Assignee: Bryan Duxbury
>             Fix For: 0.2.0
>
>         Attachments: 71-v2.patch, 71-v3.patch, 71-v4.patch, 71-v5.patch, 71.patch
>
>
> The master currently only does region assignments at startup or when there are splits
or dead regionservers. This means that if you join a new regionserver to the cluster after
startup, it does not get assigned a fair share of the already-served regions as you would
expect. It only gets a share of new regions being served.
> The master should periodically check the balance of regions, based on whatever assignment
function, instead of in reaction to the above listed events.

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