should Storage.unlockAll() work through the list of storageDirs before bailing 
out?
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                 Key: HADOOP-4240
                 URL: https://issues.apache.org/jira/browse/HADOOP-4240
             Project: Hadoop Core
          Issue Type: Improvement
          Components: dfs
    Affects Versions: 0.19.0
            Reporter: Steve Loughran
            Priority: Minor


Storage.unlockAll will forward any exception raised while trying to unlock a 
storage directory. However, it may be more robust to catch the exception and 
run through the remaining directories before relaying any (non-null) exception. 
That way a single directory playing up (it may be offline) won't stop the rest 
of the filesystem being released when a name node shuts down. 


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