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https://issues.apache.org/jira/browse/HADOOP-2617?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12559298#action_12559298
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Billy Pearson commented on HADOOP-2617:
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something we should run form the master would be nice

hbase master -refreshregions

have them reread the config files

> [hbase] Change configuration on running cluster
> -----------------------------------------------
>
>                 Key: HADOOP-2617
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2617
>             Project: Hadoop
>          Issue Type: Improvement
>            Reporter: stack
>            Priority: Minor
>
> Most options currently require restart for them to be noticed or taking table 
> offline.  It should be possible to change certain configuration attributes 
> even though the cluster is online and under load; examples would include 
> setting flush and compaction size/frequency/limits or more radically, 
> changing region size.  

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