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https://issues.apache.org/jira/browse/HDFS-3359?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13267634#comment-13267634
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Daryn Sharp commented on HDFS-3359:
-----------------------------------

+1 Nice catch.
                
> 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
>         Attachments: 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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