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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7046) HA NN can NPE upon transition to active
Date Fri, 19 Sep 2014 20:12:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7046?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14141205#comment-14141205
] 

Kihwal Lee commented on HDFS-7046:
----------------------------------

Thanks for the review, Aaron.
[~jingzhao], are you okay with the patch?

> 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
>            Assignee: Kihwal Lee
>            Priority: Critical
>         Attachments: HDFS-7046.patch, HDFS-7046_test_reproduce.patch
>
>
> 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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