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From "Hiroshi Ikeda (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-14222) Improve DrainBarrier
Date Fri, 14 Aug 2015 06:19:46 GMT
Hiroshi Ikeda created HBASE-14222:
-------------------------------------

             Summary: Improve DrainBarrier
                 Key: HBASE-14222
                 URL: https://issues.apache.org/jira/browse/HBASE-14222
             Project: HBase
          Issue Type: Bug
          Components: util
            Reporter: Hiroshi Ikeda
            Assignee: Hiroshi Ikeda
            Priority: Minor


1. {{DrainBarrier.stopAndDrainOps}} may wait forever if {{DrainBarrier.endOp}} changes its
state and calls {{Object.notifyAll}} just before {{stopAndDrainOps}} enters the synchronized
block to call {{Object.wait}}. Moreover, {{Object.wait}} may wake up false-positively, and
{{stopAndDrainOps}} may break the block before outstanding operations are complete.

2. Some tests for {{DrainBarrier}} catch and ignore {{AssertionError}} explicitly thrown JUnit's
{{fail}} method.

The implementation of {{DrainBarrier}} is a little complex, and I'll fix and refactor it.




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