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https://issues.apache.org/jira/browse/HDFS-3359?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Joseph Evans updated HDFS-3359:
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Attachment: hdfs-3359-branch-0.23.txt
I really would like to see this fix go into 0.23 as well. The patch did not
apply cleanly so I have created my own. If someone could please review and
commit this to 0.23 I really would appreciate it.
> DFSClient.close should close cached sockets
> -------------------------------------------
>
> Key: HDFS-3359
> URL: https://issues.apache.org/jira/browse/HDFS-3359
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs client
> Affects Versions: 0.22.0, 2.0.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Priority: Critical
> Fix For: 2.0.0
>
> Attachments: hdfs-3359-branch-0.23.txt, hdfs-3359.txt, hdfs-3359.txt
>
>
> Some applications like the TT/JT (pre-2.0) and probably the RM/NM cycle
> through DistributedFileSystem objects reasonably frequently. So long as they
> call close() it isn't a big problem, except that currently DFSClient.close()
> doesn't explicitly close the SocketCache. So unless a full GC runs (causing
> the references to get finalized), many SocketCaches can get orphaned, each
> with many open sockets inside. We should fix the close() function to close
> all cached sockets.
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