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https://issues.apache.org/jira/browse/HDFS-3646?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13412893#comment-13412893
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Uma Maheswara Rao G commented on HDFS-3646:
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{quote}
Unfortunately accidents do happen and streams don't always get closed. Since
{{DFSClient}} has a hard reference to the stream, the lost stream will remain
open as long as the client is open.
{quote}
IMO, this will a leak from application side, since there is a bug in closing
the streams from app.
> 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, 2.0.1-alpha, 3.0.0
>
>
> 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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