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From "Todd Lipcon (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-2988) Improve error message when storage directory lock fails
Date Wed, 22 Feb 2012 22:15:55 GMT
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


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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