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Date: Sun, 8 Jul 2012 00:45:34 +0000 (UTC)
From: "Hudson (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-2988) Improve error message when storage
 directory lock fails
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    [ https://issues.apache.org/jira/browse/HDFS-2988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13408820#comment-13408820 ] 

Hudson commented on HDFS-2988:
------------------------------

Integrated in Hadoop-Hdfs-trunk-Commit #2499 (See [https://builds.apache.org/job/Hadoop-Hdfs-trunk-Commit/2499/])
    HDFS-2988. Improve error message when storage directory lock fails. Contributed by Miomir Boljanovic. (harsh) (Revision 1358683)

     Result = SUCCESS
harsh : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1358683
Files : 
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/common/Storage.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestCheckpoint.java

                
> 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
>             Fix For: 2.0.1-alpha
>
>         Attachments: HDFS-2988.patch, 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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