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https://issues.apache.org/jira/browse/HDFS-3884?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13448461#comment-13448461
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Eli Collins commented on HDFS-3884:
-----------------------------------
+1 to the delta, makes sense.
> 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, hdfs-3884.txt, 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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