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From "Miomir Boljanovic (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2988) Improve error message when storage directory lock fails
Date Sat, 07 Jul 2012 23:08:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13408807#comment-13408807
] 

Miomir Boljanovic commented on HDFS-2988:
-----------------------------------------

Hi Karthik and Harsh, thanks for the reviews. 
Should I fix the nits and create another patch?

Btw, I ran mvn javadoc:javadoc and could not find any javadoc warnings caused directly by
the patch.
Please let me know if I am missing something.

Cheers,

Miomir
                
> Improve error message when storage directory lock fails
> -------------------------------------------------------
>
>                 Key: HDFS-2988
>                 URL: https://issues.apache.org/jira/browse/HDFS-2988
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>            Reporter: Todd Lipcon
>            Priority: Minor
>              Labels: newbie
>         Attachments: HDFS-2988.patch, HDFS-2988.patch, HDFS-2988.patch
>
>
> Currently, the error message is fairly opaque to a non-developer ("Cannot lock storage"
or something). Instead, we should have some improvments:
> - when we create the in_use.lock file, we should write the hostname/PID that locked the
file
> - if the lock fails, and in_use.lock exists, the error message should say something like
"It appears that another namenode (pid 23423 on host foo.example.com) has already locked the
storage directory."
> - if the lock fails, and no lock file exists, the error message should say something
like "if this storage directory is mounted via NFS, ensure that the appropriate nfs lock services
are running."

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