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https://issues.apache.org/jira/browse/HBASE-15774?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on HBASE-15774 started by Mikhail Antonov.
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> 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
> Assignee: Mikhail Antonov
>
> Just do double checked locking.
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