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https://issues.apache.org/jira/browse/HDFS-4485?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aaron T. Myers resolved HDFS-4485.
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Resolution: Fixed
I've just committed this to the HDFS-347 branch.
Thanks a lot for the contribution, Colin.
> HDFS-347: DN should chmod socket path a+w
> -----------------------------------------
>
> Key: HDFS-4485
> URL: https://issues.apache.org/jira/browse/HDFS-4485
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: datanode
> Reporter: Todd Lipcon
> Assignee: Colin Patrick McCabe
> Priority: Critical
> Attachments: HDFS-4485.001.patch, HDFS-4485.003.patch
>
>
> In cluster-testing HDFS-347, we found that in clusters where the MR job
> doesn't run as the same user as HDFS, clients wouldn't use short circuit read
> because of a 'permission denied' error connecting to the socket. It turns out
> that, in order to connect to a socket, clients need write permissions on the
> socket file.
> The DN should set these permissions automatically after it creates the socket.
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