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https://issues.apache.org/jira/browse/HBASE-71?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12572299#action_12572299
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Jim Kellerman commented on HBASE-71:
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> Bryan Duxbury - 25/Feb/08 02:52 PM
> Instead, maybe we could introduce a way for one regionserver to keep serving
> a region while
> another opens it read-only.
-1
How are you going to open a region "read-only" if its state is changing? Files
and their contents
are not visible while being written.
Even if you could do this how would the new region server maintain a coherent
view of
what the region looks like, since flushes, compactions and splits could happen
before
it gets told it can now serve the region.
> [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
>
>
> 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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