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From "Sean Mackrory (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11096) Support rolling upgrade between 2.x and 3.x
Date Thu, 07 Sep 2017 15:52:01 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11096?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16157122#comment-16157122

Sean Mackrory commented on HDFS-11096:

It would be good to document the order of running the scripts (e.g. env.sh, call one of the
*_cluster_env() functions then build-distributed-hadoop).
Add help documentation or document calling build-distributed-hadoop args.
It sources bash/functions.sh, which isn't visible if you're not running in dev-support/compat.

So for these points, anything under bash/ is not meant to be run directly - it's all called
by the main test scripts. So someone running tests should just need to run "./docker-rolling-upgrade.sh"
from that directory. I've tried to have scripts meant to be run directly consistently ensure
that their working directory is the one they're in so relatively paths are all fine. Adding
documentation would be good, but it'd really be targeted at people adding new tests, not running
the existing ones - so just wanted to make sure that was clear.

> 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, HDFS-11096.002.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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