Todd Lipcon created HDFS-3795:
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             Summary: QJM: validate journal dir at startup
                 Key: HDFS-3795
                 URL: https://issues.apache.org/jira/browse/HDFS-3795
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: ha
    Affects Versions: QuorumJournalManager (HDFS-3077)
            Reporter: Todd Lipcon
            Assignee: Todd Lipcon
            Priority: Minor
         Attachments: hdfs-3795.txt

Currently, the JN does not validate the configured journal directory until it 
tries to write into it. This is counter-intuitive for users, since they would 
expect to find out about a misconfiguration at startup time, rather than on 
first access. Additionally, two testers accidentally configured the journal dir 
to be a URI, which the code accidentally understood as a relative path 
({{CWD/file:/foo/bar}}.

We should validate the config at startup to be an accessible absolute path.

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