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https://issues.apache.org/jira/browse/HDFS-1131?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12864217#action_12864217
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Alejandro Abdelnur commented on HDFS-1131:
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A solution would be to have a singleton variable =ScheduledThreadPoolExecutor=
in the DFSClient and all DFSClients should schedule their =LeaseChecker= with
it.
The =LeaseChecker= =run()= method should be changed not to loop/sleep letting
the =ScheduledThreadPoolExecutor= to take care of that.
On close the =LeaseChecker= should remove from the =ScheduledThreadPoolExecutor=
> each DFSClient instance uses a daemon thread for lease checking, there should
> be a singleton daemon for all DFSClient instances
> -------------------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-1131
> URL: https://issues.apache.org/jira/browse/HDFS-1131
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Alejandro Abdelnur
> Priority: Critical
>
> When accessing HDFS from a server application that acts on behalf of several
> users each user has its own file system handle (DFSClient), this creates one
> daemon thread per file system instance.
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