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https://issues.apache.org/jira/browse/HDFS-7419?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14223282#comment-14223282
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Colin Patrick McCabe commented on HDFS-7419:
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+1. Thanks, [~eddyxu].
> Improve error messages for DataNode hot swap drive feature
> ----------------------------------------------------------
>
> Key: HDFS-7419
> URL: https://issues.apache.org/jira/browse/HDFS-7419
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Affects Versions: 2.5.1
> Reporter: Lei (Eddy) Xu
> Assignee: Lei (Eddy) Xu
> Attachments: HDFS-7419.000.patch, HDFS-7419.001.patch,
> HDFS-7419.002.patch, HDFS-7419.003.patch
>
>
> When DataNode fails to add a volume, it adds one failure message to
> {{errorMessageBuilder}} in {{DataNode#refreshVolumes}}. However, the detailed
> error messages are not logged in DataNode's log and they are emitted from
> clients.
> This JIRA makes {{DataNode}} reports detailed failure in its log.
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