Improve error message when storage directory lock fails
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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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