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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-3646) LeaseRenewer can hold reference to inactive DFSClient instances forever
Date Tue, 17 Jul 2012 16:44:34 GMT

     [ https://issues.apache.org/jira/browse/HDFS-3646?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Kihwal Lee updated HDFS-3646:
-----------------------------

    Attachment: hdfs-3646.patch.txt
    
> LeaseRenewer can hold reference to inactive DFSClient instances forever
> -----------------------------------------------------------------------
>
>                 Key: HDFS-3646
>                 URL: https://issues.apache.org/jira/browse/HDFS-3646
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs client
>    Affects Versions: 0.23.3, 2.0.0-alpha
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>            Priority: Critical
>             Fix For: 0.23.3, 2.1.0-alpha, 3.0.0
>
>         Attachments: hdfs-3646.patch, hdfs-3646.patch.txt, hdfs-3646.patch.txt
>
>
> If {{LeaseRenewer#closeClient()}} is not called, {{LeaseRenewer}} keeps the reference
to a {{DFSClient}} instance in {{dfsclients}} forever. This prevents {{DFSClient}}, {{LeaseRenewer}},
conf, etc. from being garbage collected, leading to memory leak.
> {{LeaseRenewer}} should remove the reference after some delay, if a {{DFSClient}} instance
no longer has active streams.

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