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From "Sean Mackrory (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-11096) Support rolling upgrade between 2.x and 3.x
Date Mon, 28 Aug 2017 16:36:02 GMT

     [ https://issues.apache.org/jira/browse/HDFS-11096?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Sean Mackrory updated HDFS-11096:
    Attachment: HDFS-11096.001.patch

So Docker support has been added for the rolling-upgrade and pull-over-http test. They're
using the same Docker image as Yetus builds, etc. And they've been really robust lately. I've
corrected the copyright headers at the top of the files, and I think dev-support/compat is
a good place for these tests to live - but I'm open to other ideas as well.

The Python tests are all still working, but they did not seem to catch the previous incompatibility
that prevented older clients from writing to newer DataNodes. There's also still a few TODOs
or thing that don't work and it's not clear why. So definitely more work to be done, but there's
value in the existing CLI compatibility tests.

I'd like to get this put in the codebase and get some Jenkins jobs running on it soon.

> 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
>            Assignee: Sean Mackrory
>            Priority: Blocker
>         Attachments: HDFS-11096.001.patch
> 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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