Victor Xu created HBASE-14954:
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             Summary: IllegalArgumentException was thrown when doing online 
configuration change in CompactSplitThread
                 Key: HBASE-14954
                 URL: https://issues.apache.org/jira/browse/HBASE-14954
             Project: HBase
          Issue Type: Bug
          Components: Compaction, regionserver
    Affects Versions: 1.1.2
            Reporter: Victor Xu
            Assignee: Victor Xu


Online configuration change is a terrific feature for HBase administrators. 
However, when we use this feature to tune compaction thread pool size online, 
it triggered a IllegalArgumentException. The cause is the order of 
setMaximumPoolSize() and setCorePoolSize() of ThreadPoolExecutor: when turning 
parameters bigger, we should setMax first; when turning parameters smaller, we 
need to setCore first. Besides, there is also a copy-code bug in merge and 
split thread pool which I will fix together.



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