Stagger Major Compactions
-------------------------

                 Key: HBASE-3189
                 URL: https://issues.apache.org/jira/browse/HBASE-3189
             Project: HBase
          Issue Type: Bug
          Components: regionserver
            Reporter: Nicolas Spiegelberg
            Assignee: Nicolas Spiegelberg
            Priority: Minor


For pre-split regions, we can get into a case where the oldest HFile in a Store 
is pretty large and will not encounter a compaction within the 24hr major 
compact window.  If that's the case, we don't want multiple multi-GB major 
compactions being triggered at the same time.  Add ability to stagger the major 
compaction expiration window.

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