[jira] [Created] (TAJO-1536) Fix minor issues in QueryMaster

[Navis (JIRA)]

Navis created TAJO-1536:
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             Summary: Fix minor issues in QueryMaster
                 Key: TAJO-1536
                 URL: https://issues.apache.org/jira/browse/TAJO-1536
             Project: Tajo
          Issue Type: Bug
            Reporter: Navis
            Assignee: Navis
            Priority: Trivial


1. queryMasterTasks/finishedQueryMasterTasks are not locked properly
2. heartbeat does not releases connection



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