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https://issues.apache.org/jira/browse/HDFS-5835?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13883627#comment-13883627
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Tsz Wo (Nicholas), SZE commented on HDFS-5835:
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Thanks Arpit and Jing for reviewing the patch.
# Yes. See also #2 below.
# Suppose NN1 is active and NN2 is standby. NN2 will be updated first. Then
NN1 will failover to NN2. And then NN1 will be updated.
# SBN should do checkpoint only before the update marker.
I add tests for the cases above.
> Add a new option for starting standby NN when rolling upgrade is in progress
> ----------------------------------------------------------------------------
>
> Key: HDFS-5835
> URL: https://issues.apache.org/jira/browse/HDFS-5835
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
> Attachments: h5835_20130127.patch
>
>
> When rolling upgrade is already in-progress and the standby NN is not yet
> started up, a new startup option is needed for the standby NN to initialize
> the upgrade status.
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