Andrew Wang created HDFS-11096:
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Summary: 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
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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