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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7934) During Rolling upgrade rollback ,standby namenode startup fails.
Date Fri, 10 Apr 2015 07:13:13 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7934?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14489086#comment-14489086

Jing Zhao commented on HDFS-7934:

For HA upgrade (not rollingUpgrade), currently we also require using "-bootstrapstandby" for
the SBN after rolling back the ANN. Rolling rollback should follow similar path, otherwise
we will hit issue like HDFS-7952, since rolling back JNs requires that the corresponding NN
to become the QJM writer.

> During Rolling upgrade rollback ,standby namenode startup fails.
> ----------------------------------------------------------------
>                 Key: HDFS-7934
>                 URL: https://issues.apache.org/jira/browse/HDFS-7934
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: J.Andreina
>            Assignee: J.Andreina
>            Priority: Critical
>         Attachments: HDFS-7934.1.patch
> During Rolling upgrade rollback , standby namenode startup fails , while loading edits
and when  there is no local copy of edits created after upgrade ( which is already been removed
 by Active Namenode from journal manager and from Active's local). 

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