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https://issues.apache.org/jira/browse/HDFS-13929?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16622223#comment-16622223
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Daryn Sharp commented on HDFS-13929:
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Not sure of exact version that introduced the issue.
> DFSClient leaks data streamer sockets
> -------------------------------------
>
> Key: HDFS-13929
> URL: https://issues.apache.org/jira/browse/HDFS-13929
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.8.0
> Reporter: Daryn Sharp
> Priority: Major
>
> Sockets to DNs may linger in the CLOSE_WAIT state which means the remote peer
> (DN) closed the socket but the local client has not. The socket does not
> transition to TIME_WAIT until the java process exits which is indicative of a
> leaked file descriptor. Interestingly there is always 1 byte remaining to be
> read.
> {noformat}
> $ netstat -tnn|fgrep :1004|fgrep -v EST
> tcp 1 0 THISHOST:57158 RANDOMHOST:1004 CLOSE_WAIT
>
> tcp 1 0 THISHOST:40346 RANDOMHOST:1004 CLOSE_WAIT
>
> tcp 1 0 THISHOST:45504 RANDOMHOST:1004 CLOSE_WAIT
>
> tcp 1 0 THISHOST:58958 RANDOMHOST:1004 CLOSE_WAIT
>
> tcp 1 0 THISHOST:45570 RANDOMHOST:1004 CLOSE_WAIT
>
> tcp 1 0 THISHOST:46496 RANDOMHOST:1004 CLOSE_WAIT
>
> tcp 1 0 THISHOST:58944 RANDOMHOST:1004 CLOSE_WAIT
>
> tcp 1 0 THISHOST:55540 RANDOMHOST:1004 CLOSE_WAIT
>
> {noformat}
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