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https://issues.apache.org/jira/browse/HDFS-3225?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Suresh Srinivas resolved HDFS-3225.
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Resolution: Done
The rolling upgrade and the related issues have been address in the umbrella
jiar, HDFS-5535. I do not think there is any work that needs to be done to
address this. Resolving this as "Done"
> Revist upgrade snapshots, roll back, finalize to enable rolling upgrades
> ------------------------------------------------------------------------
>
> Key: HDFS-3225
> URL: https://issues.apache.org/jira/browse/HDFS-3225
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Sanjay Radia
> Assignee: Sanjay Radia
>
> With introduction of wire comaptibility, HDFS is ready for rolling upgrades.
> Various design choices such as version checks and when to do upgrade
> snaopshots, rollbacks, finalize need to be revisited.
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