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From "Robert Joseph Evans (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-3359) DFSClient.close should close cached sockets
Date Fri, 04 May 2012 14:38:49 GMT

     [ https://issues.apache.org/jira/browse/HDFS-3359?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Robert Joseph Evans updated HDFS-3359:
--------------------------------------

    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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