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https://issues.apache.org/jira/browse/HDFS-7046?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14130079#comment-14130079
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Aaron T. Myers commented on HDFS-7046:
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Good find, Daryn. Given that you marked this as affecting 2.5.0, do you have
reason to believe that this does not affect earlier versions?
> HA NN can NPE upon transition to active
> ---------------------------------------
>
> Key: HDFS-7046
> URL: https://issues.apache.org/jira/browse/HDFS-7046
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 3.0.0, 2.5.0
> Reporter: Daryn Sharp
> Priority: Critical
>
> While processing edits, the NN may decide after adjusting block totals to
> leave safe mode - in the middle of the edit. Going active starts the secret
> manager which generates a new secret key, which in turn generates an edit,
> which NPEs because the edit log is not open.
> # Transitions should _not_ occur in the middle of an edit.
> # The edit log appears to claim it's open for write when the stream isn't
> even open
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