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From "Jing Zhao (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 00:25:39 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5835?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13883558#comment-13883558

Jing Zhao commented on HDFS-5835:

+1 the Patch looks good to me.

Some questions not related to the patch: 
# So when we start the SBN, the SBN already has been upgraded?
# Is it possible that the NN failover just happens when we start the SBN? Or the other NN
is in standby state at this time, and this NN will become active in the end? In that case
this "STARTED' option may also be applied to the ANN?
# If we allow SBN to do checkpoint during the rolling upgrade, the SBN may not hit the upgrade
marker in the editlog when it restarts. Thus the current document said we would disable the
checkpoint. But this may also cause issue if the time between "start" and "finalize" is long.
Since we do not delete old editlog and fsimage during checkpointing, an alternative way is
to scan the editlog even across the fsimage?

> 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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