[hbase] Change configuration on running cluster
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                 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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