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https://issues.apache.org/jira/browse/HADOOP-6459?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12804976#action_12804976
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Hudson commented on HADOOP-6459:
--------------------------------
Integrated in Hadoop-Common-trunk #233 (See
[http://hudson.zones.apache.org/hudson/job/Hadoop-Common-trunk/233/])
. IPC client bug may cause rpc call hang. Contributed by Hairong Kuang.
> IPC server should set SO_KEEPALIVE to the accepted sockets
> ----------------------------------------------------------
>
> Key: HADOOP-6459
> URL: https://issues.apache.org/jira/browse/HADOOP-6459
> Project: Hadoop Common
> Issue Type: Improvement
> Affects Versions: 0.20.1
> Reporter: Qi Liu
> Attachments: HADOOP-6459.0.20.patch, HADOOP-6459.patch
>
>
> When there is some unexpected network outage or client-side issue, the
> network connection could stay alive forever, due to the lack of keep alive.
> We have observed such dead connection in name node. Though it has no known
> performance hits, but it is a waste of resource. Adding SO_KEEPALIVE to all
> accepted sockets should not be heavy, since the keep alive TCP packets will
> only be sent once every four hours.
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