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From "Yongjun Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9612) DistCp worker threads are not terminated after jobs are done.
Date Thu, 14 Jan 2016 22:12:40 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9612?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15098991#comment-15098991
] 

Yongjun Zhang commented on HDFS-9612:
-------------------------------------

Hi [~jojochuang],

The patch looks good to me, except a minor thing: the call to {{Thread.currentThread().interrupt();}}
in the test code does not seem necessary. +1 after addressing this comment.

Thanks.


> 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
>         Attachments: HDFS-9612.001.patch, HDFS-9612.002.patch, HDFS-9612.003.patch, HDFS-9612.004.patch,
HDFS-9612.005.patch, HDFS-9612.006.patch, HDFS-9612.007.patch
>
>
> 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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