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https://issues.apache.org/jira/browse/HDFS-1840?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13025932#comment-13025932
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Tsz Wo (Nicholas), SZE commented on HDFS-1840:
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Before the patch in this issue, you are right that the number of threads
increases as more and more users submitting jobs to JobTracker since the
threads live forever even if some users stop submitting jobs. This issue is to
fix the problem -- changed the threads to that they will terminate. In the
JobTracker case, the number of threads will decrease when users stop submitting
new jobs. So this actually improves the performance. :)
> Terminate LeaseChecker when all writing files are closed.
> ---------------------------------------------------------
>
> Key: HDFS-1840
> URL: https://issues.apache.org/jira/browse/HDFS-1840
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs client
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
> Fix For: 0.23.0
>
> Attachments: h1840_20110418.patch, h1840_20110419.patch,
> h1840_20110419b.patch
>
>
> In {{DFSClient}}, when there are files opened for write, a {{LeaseChecker}}
> thread is started for updating the leases periodically. However, it never
> terminates when when all writing files are closed.
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