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https://issues.apache.org/jira/browse/HDFS-11096?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16157122#comment-16157122
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Sean Mackrory commented on HDFS-11096:
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{quote}
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.
{quote}
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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