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From "Michael Han (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ZOOKEEPER-3096) Leader should not leak LearnerHandler threads
Date Fri, 20 Jul 2018 18:46:00 GMT
Michael Han created ZOOKEEPER-3096:

             Summary: Leader should not leak LearnerHandler threads
                 Key: ZOOKEEPER-3096
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3096
             Project: ZooKeeper
          Issue Type: Bug
          Components: quorum, server
    Affects Versions: 3.4.13, 3.5.4, 3.6.0
            Reporter: Michael Han
            Assignee: Michael Han

Currently we don't track LearnerHandler threads in leader; we rely on the socket timeout to
raise an exception and use that exception as a signal to let the LearnerHandler thread kills
itself. In cases where the learners restarts, if the time between restart beginning to finishing
is less than the socket timeout value (currently hardcoded as initLimit * tickTime), then
there will be no exception raised and the previous LearnerHandler thread corresponding to
this learner will leak.

I have a test case and a proposed fix which I will submit later.

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