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https://issues.apache.org/jira/browse/HDFS-2988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13291421#comment-13291421
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Todd Lipcon commented on HDFS-2988:
-----------------------------------
I think you could still write a unit test here -- just instantiate a
StorageDirectory, lock it, and then try to do the same again. Assert that you
get an error message which includes the name of the JVM. See
TestCheckpoint.testSecondaryNameNodeLocking for example.
> 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
>
>
> 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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