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https://issues.apache.org/jira/browse/HDFS-2983?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13213955#comment-13213955
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Todd Lipcon commented on HDFS-2983:
-----------------------------------
Would be nice to, at the same time or separately, add a "cluster version
summary" section on the web UIs and JMX. I'm thinking something like a table
like:
| Build version | Build rev | Number of nodes | Node list ... |
| 0.23.1 | r294294 | 99 | too many to list |
| 0.23.1-SNAPSHOT | r294295 | 1 | dn034.example.com |
and perhaps some kind of banner at the top of the NN UI indicating that a
rolling upgrade is in progress (ie that the cluster has mixed versions)
> Relax the build version check to permit rolling upgrades within a release
> -------------------------------------------------------------------------
>
> Key: HDFS-2983
> URL: https://issues.apache.org/jira/browse/HDFS-2983
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 0.23.0
> Reporter: Eli Collins
>
> Currently the version check for DN/NN communication is strict (it checks the
> exact svn revision or git hash, Storage#getBuildVersion calls
> VersionInfo#getRevision), which prevents rolling upgrades across any
> releases. Once we have the PB-base RPC in place (coming soon to branch-23)
> we'll have the necessary pieces in place to loosen this restriction, though
> perhaps it takes another 23 minor release or so before we're ready to commit
> to making the minor versions compatible.
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