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https://issues.apache.org/jira/browse/HDFS-2983?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13250954#comment-13250954
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Todd Lipcon commented on HDFS-2983:
-----------------------------------
How about the following proposal:
- change the check for DN registration so that, if the DN's ctime differs from
the NN's ctime (i.e the NN has started a snapshot style upgrade), then the
version check will be strict
- file a follow-up JIRA to add a cluster version summary to the web UI and to
the NN metrics, allowing ops to monitor whether they have machines that might
have "missed" a rolling upgrade
Does that address your concern? I agree with your point that it can be
confusing to manage, but not sure what the specific change you're asking for is.
> 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: 2.0.0
> Reporter: Eli Collins
> Assignee: Aaron T. Myers
> Attachments: HDFS-2983.patch, HDFS-2983.patch, HDFS-2983.patch,
> HDFS-2983.patch, HDFS-2983.patch, HDFS-2983.patch, HDFS-2983.patch
>
>
> 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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