Todd Lipcon created HDFS-3884:
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             Summary: QJM: Journal format() should reset cached values
                 Key: HDFS-3884
                 URL: https://issues.apache.org/jira/browse/HDFS-3884
             Project: Hadoop HDFS
          Issue Type: Sub-task
    Affects Versions: QuorumJournalManager (HDFS-3077)
            Reporter: Todd Lipcon
            Assignee: Todd Lipcon
             Fix For: QuorumJournalManager (HDFS-3077)
         Attachments: hdfs-3884.txt

Simple bug in the JournalNode: it caches certain values (eg accepted epoch) in 
memory, and the cached values aren't reset when the journal is formatted. So, 
after a format, further calls to the same Journal will see the old value for 
accepted epoch, writer epoch, etc, preventing the journal from being re-used 
until the JN is restarted.

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