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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5835) Add a new option for starting standby NN when rolling upgrade is in progress
Date Tue, 28 Jan 2014 01:40:40 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5835?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13883627#comment-13883627
] 

Tsz Wo (Nicholas), SZE commented on HDFS-5835:
----------------------------------------------

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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