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https://issues.apache.org/jira/browse/HDFS-6000?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jing Zhao updated HDFS-6000:
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Attachment: HDFS-6000.000.patch
Initial patch. Still need to fix/update unit tests.
With the changes in this patch, the SBN will name the first checkpoint after
starting rolling upgrade process as "fsimage_rollback".
The current implementation requires that the NN directory does not contain a
rollback image before we start the rolling upgrade process. Thus the patch also
purges rollback image for "downgrade" (we already do this for "finalize").
> 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
>
>
> 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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