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From Abraham Fine <af...@apache.org>
Subject Re: [NEW] ZK upgrade test tool
Date Tue, 06 Feb 2018 19:54:19 GMT
Great work Andor!

This will be super valuable going forward, especially the rolling upgrade stuff.

Abe

On Tue, Feb 6, 2018, at 04:44, Andor Molnar wrote:
> Hi,
> 
> I thought it could be interesting for some of you that I started to work on
> an automated upgrade testing tool for ZooKeeper.
> 
> https://github.com/anmolnar/zk-upgrade-test
> 
> Reasoning behind it is that later, when 3.5 becomes stable, we'd like to
> validate if we can upgrade our 3.4 instances without problems.
> 
> Currently it's in very early stage, there're a still a lot of moving parts
> and it's only a basic command line tool, but I'd like to get some community
> feedback to decide which approach could be the best for such tool and how
> many of you find it useful.
> 
> The scaffolding is pretty-much ready:
> 
> By default, the tool creates a CentOS7-based docker image and downloads the
> source and the target version of ZooKeeper inside.
> 
> Next, it fires up a dedicated docker network and starts as many containers
> as the number of nodes in the test ensemble.
> 
> Testing steps are currently as basic as it could be:
> 1. Create config
> 2. Start 'source' version
> 3. Run smoke test (create node)
> 4. Stop / start 'target' version
> 5. Run smoke test (read the original node)
> 
> What's coming?
> - config side: I'd like to have a way to inject custom configuration files
> somehow instead of hardcoding it.
> - config transformation: it'd be useful to do some config transformation
> before the upgrade, because it's very likely needed in real world scenario,
> - smoke tests: add more smoke tests to cover more functionality,
> - rolling upgrade: shouldn't upgrade all nodes at once. Rather I'd like to
> upgrade one node at a time and run smoke tests in each iteration.
> 
> Regards,
> Andor

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