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https://issues.apache.org/jira/browse/HDFS-1840?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13025540#comment-13025540
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Cheng Leong commented on HDFS-1840:
-----------------------------------
According to the thread dump of my cluster's JobTracker, there were over 40k
LeaseChecker threads - I would imagine all the other Hadoop users should have
seen this before as well? Shouldn't this cause some sort of performance
degradation?
> 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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