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https://issues.apache.org/jira/browse/HDFS-884?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12976142#action_12976142
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Eli Collins commented on HDFS-884:
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+1 latest patch looks good.
> DataNode makeInstance should report the directory list when failing to start
> up
> -------------------------------------------------------------------------------
>
> Key: HDFS-884
> URL: https://issues.apache.org/jira/browse/HDFS-884
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: data-node
> Affects Versions: 0.22.0
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Priority: Minor
> Fix For: 0.22.0
>
> Attachments: HDFS-884.patch, HDFS-884.patch, InvalidDirs.patch
>
>
> When {{Datanode.makeInstance()}} cannot work with one of the directories in
> dfs.data.dir, it logs this at warn level (while losing the stack trace).
> It should include the nested exception for better troubleshooting. Then, when
> all dirs in the list fail, an exception is thrown, but this exception does
> not include the list of directories. It should list the absolute path of
> every missing/failing directory, so that whoever sees the exception can see
> where to start looking for problems: either the filesystem or the
> configuration.
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