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https://issues.apache.org/jira/browse/HDFS-14575?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17422055#comment-17422055
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Xiaoqiao He commented on HDFS-14575:
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Thanks for reminder. Cherry-pick to branch-3.3 and branch-3.2(include
branch-3.2.3). Thanks [~weichiu],[~prasad-acit].
> LeaseRenewer#daemon threads leak in DFSClient
> ---------------------------------------------
>
> Key: HDFS-14575
> URL: https://issues.apache.org/jira/browse/HDFS-14575
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 3.1.0
> Reporter: Tao Yang
> Assignee: Renukaprasad C
> Priority: Major
> Fix For: 3.4.0
>
> Attachments: HDFS-14575.001.patch, HDFS-14575.002.patch,
> HDFS-14575.003.patch, HDFS-14575.004.patch
>
>
> Currently LeaseRenewer (and its daemon thread) without clients should be
> terminated after a grace period which defaults to 60 seconds. A race
> condition may happen when a new request is coming just after LeaseRenewer
> expired.
> Reproduce this race condition:
> # Client#1 creates File#1: creates LeaseRenewer#1 and starts Daemon#1
> thread, after a few seconds, File#1 is closed , there is no clients in
> LeaseRenewer#1 now.
> # 60 seconds (grace period) later, LeaseRenewer#1 just expires but daemon#1
> thread is still in sleep, Client#1 creates File#2, lead to the creation of
> Daemon#2.
> # Daemon#1 is awake then exit, after that, LeaseRenewer#1 is removed from
> factory.
> # File#2 is closed after a few seconds, LeaseRenewer#2 is created since it
> can’t get renewer from factory.
> Daemon#2 thread leaks from now on, since Client#1 in it can never be removed
> and it won't have a chance to stop.
> To solve this problem, IIUIC, a simple way I think is to make sure that all
> clients are cleared when LeaseRenewer is removed from factory. Please feel
> free to give your suggestions. Thanks!
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