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https://issues.apache.org/jira/browse/HDFS-2983?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13248716#comment-13248716
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Todd Lipcon commented on HDFS-2983:
-----------------------------------
Hey Sanjay. I agree that the snapshot-on-upgrade feature is really important,
and I don't think this work precludes/breaks that. Here's my line of thinking:
- even with the ability to do rolling upgrade, there is no restriction that you
_must_ do upgrades like this. So, you could still decide to use the current
upgrade process as a policy decision.
- As you mentioned, many upgrades/hotfixes/EBFs don't touch core code, so for
those, most people would prefer a rolling upgrade without downtime.
- separately, after this is committed, we can work on figuring out a strategy
that allows you to do an upgrade-style snapshot before starting the rolling
upgrade. It looks like you just filed HDFS-3225 for this, so let's continue
this discussion there.
Agree?
> 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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