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https://issues.apache.org/jira/browse/HDFS-11096?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16246667#comment-16246667
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Sean Mackrory commented on HDFS-11096:
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Note that the fix to the sbin/start-yarn.sh shell script has now been committed
spearately as YARN-7465. I'm working with [~rchiang] to figure out why YARN is
failing after the rolling upgrade - it works in both Hadoop 2 and Hadoop 3 in
the clusters used for the distcp test - it's only after the upgrade...
> Support rolling upgrade between 2.x and 3.x
> -------------------------------------------
>
> Key: HDFS-11096
> URL: https://issues.apache.org/jira/browse/HDFS-11096
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: rolling upgrades
> Affects Versions: 3.0.0-alpha1
> Reporter: Andrew Wang
> Assignee: Sean Mackrory
> Priority: Blocker
> Attachments: HDFS-11096.001.patch, HDFS-11096.002.patch,
> HDFS-11096.003.patch, HDFS-11096.004.patch, HDFS-11096.005.patch,
> HDFS-11096.006.patch, HDFS-11096.007.patch
>
>
> trunk has a minimum software version of 3.0.0-alpha1. This means we can't
> rolling upgrade between branch-2 and trunk.
> This is a showstopper for large deployments. Unless there are very compelling
> reasons to break compatibility, let's restore the ability to rolling upgrade
> to 3.x releases.
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