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Posted to hdfs-issues@hadoop.apache.org by "Renukaprasad C (Jira)" <ji...@apache.org> on 2021/06/19 13:27:00 UTC
[jira] [Assigned] (HDFS-14575) LeaseRenewer#daemon threads leak in
DFSClient
[ https://issues.apache.org/jira/browse/HDFS-14575?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Renukaprasad C reassigned HDFS-14575:
-------------------------------------
Assignee: Renukaprasad C (was: Tao Yang)
> 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
> 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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