[jira] Commented: (HDFS-884) DataNode makeInstance should report the directory list when failing to start up

["Steve Loughran (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDFS-884?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12885902#action_12885902 ] 

Steve Loughran commented on HDFS-884:
-------------------------------------

I have a more up to date version on my local git-managed SCM, I will chase it down and post, though probably not until august, as I'm about to go on vacation with no laptop for two weeks

> 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
>
>
> 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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