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From "Cheng Leong (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1840) Terminate LeaseChecker when all writing files are closed.
Date Wed, 27 Apr 2011 18:02:03 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1840?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13025923#comment-13025923
] 

Cheng Leong commented on HDFS-1840:
-----------------------------------

So the number of threads keeps increasing (in my case, 40k+), isn't this bad for JobTracker?
I am seeing some performance issue with JobTracker (web console taking 10 seconds to load),
but I am not sure if this is related. Thanks.

> 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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