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https://issues.apache.org/jira/browse/HDFS-3373?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13462787#comment-13462787
 ] 

Tsz Wo (Nicholas), SZE commented on HDFS-3373:
----------------------------------------------

{code}
+  private synchronized void evictExpired(long expiryPeriod) 
+      throws IOException {
{code}
evictExpired(..)  still has "throws IOException" but IOException is never 
thrown in the code.  Patch looks good other than that.
                
> FileContext HDFS implementation can leak socket caches
> ------------------------------------------------------
>
>                 Key: HDFS-3373
>                 URL: https://issues.apache.org/jira/browse/HDFS-3373
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs client
>    Affects Versions: 2.0.0-alpha, 3.0.0
>            Reporter: Todd Lipcon
>            Assignee: John George
>         Attachments: HDFS-3373.branch-23.patch, HDFS-3373.trunk.patch, 
> HDFS-3373.trunk.patch.1, HDFS-3373.trunk.patch.2, HDFS-3373.trunk.patch.3, 
> HDFS-3373.trunk.patch.3
>
>
> As noted by Nicholas in HDFS-3359, FileContext doesn't have a close() method, 
> and thus never calls DFSClient.close(). This means that, until finalizers 
> run, DFSClient will hold on to its SocketCache object and potentially have a 
> lot of outstanding sockets/fds held on to.

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