[jira] [Created] (HBASE-15774) Fix Upgrade lock usage in connection pool.

[Elliott Clark (JIRA)]

Elliott Clark created HBASE-15774:
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             Summary: Fix Upgrade lock usage in connection pool.
                 Key: HBASE-15774
                 URL: https://issues.apache.org/jira/browse/HBASE-15774
             Project: HBase
          Issue Type: Sub-task
            Reporter: Elliott Clark


Just do double checked locking.



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