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From "Wei-Chiu Chuang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-9612) DistCp worker threads are not terminated after jobs are done.
Date Mon, 04 Jan 2016 22:36:39 GMT
Wei-Chiu Chuang created HDFS-9612:
-------------------------------------

             Summary: DistCp worker threads are not terminated after jobs are done.
                 Key: HDFS-9612
                 URL: https://issues.apache.org/jira/browse/HDFS-9612
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: distcp
    Affects Versions: 2.8.0
            Reporter: Wei-Chiu Chuang
            Assignee: Wei-Chiu Chuang


In HADOOP-11827, a producer-consumer style thread pool was introduced to parallelize the task
of listing files/directories.

We have a use case where a distcp job is run during the commit phase of a MR2 job. However,
it was found distcp does not terminate ProducerConsumer thread pools properly. Because threads
are not terminated, those MR2 jobs never finish.

In a more typical use case where distcp is run as a standalone job, those threads are terminated
forcefully when the java process is terminated. So these leaked threads did not become a problem.



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