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https://issues.apache.org/jira/browse/HDFS-6000?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13912100#comment-13912100
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Tsz Wo (Nicholas), SZE commented on HDFS-6000:
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+1 patch looks good.
> Avoid saving namespace when starting rolling upgrade
> ----------------------------------------------------
>
> Key: HDFS-6000
> URL: https://issues.apache.org/jira/browse/HDFS-6000
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: datanode, ha, hdfs-client, namenode
> Reporter: Jing Zhao
> Assignee: Jing Zhao
> Attachments: HDFS-6000.000.patch, HDFS-6000.001.patch,
> HDFS-6000.002.patch, HDFS-6000.003.patch
>
>
> Currently when administrator sends the "rollingUpgrade start" command to the
> active NN, the NN will trigger a checkpoint (the rollback fsimage). This will
> cause NN not able to serve for a period of time.
> An alternative way is just to let the SBN do checkpoint, and rename the first
> checkpoint after starting the rolling upgrade to rollback image. After the
> rollback image is on both the ANN and the SBN, administrator can start
> upgrading the software.
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