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https://issues.apache.org/jira/browse/HDFS-4440?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13562217#comment-13562217
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Aaron T. Myers commented on HDFS-4440:
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+1, patch looks good to me. I'm going to commit this momentarily.
> avoid annoying log message when dfs.domain.socket.path is not set
> -----------------------------------------------------------------
>
> Key: HDFS-4440
> URL: https://issues.apache.org/jira/browse/HDFS-4440
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: datanode, hdfs-client, performance
> Reporter: Colin Patrick McCabe
> Assignee: Colin Patrick McCabe
> Priority: Trivial
> Attachments: HDFS-4440.001.patch
>
>
> When dfs.domain.socket.path is not set, it gets set to the empty string. We
> should check if this conf key is the empty string in {{DomainSocketFactory}},
> rather than checking against null as we currently do. Otherwise, we get
> annoying log messages about failing to connect to the UNIX domain socket at
> ''.
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