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https://issues.apache.org/jira/browse/HDFS-2983?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13247952#comment-13247952
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Tsz Wo (Nicholas), SZE commented on HDFS-2983:
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I think we should upgrade NN first. Suppose we upgrade from X to Y as in your
example. Then, upgrade can be done by (1) adding Y to conf for DN's conf, (2)
upgrading NN to Y and (3) rolling upgrade DNs to Y.
Comparing major/minor does not require changing conf but it also limits the
rolling upgrade. Say, v1.1 and v1.2 are actually compatible but we cannot
perform the upgrade due to the version check.
> 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
>
>
> 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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