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Date: Fri, 19 Feb 2016 12:16:11 +0000
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Subject: Re: Running 2 versions of Falcon on the same cluster/upgrade
 procedure
From: pragya mittal <mittal.pragya23@gmail.com>
To: dev@falcon.apache.org
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Hi Mark,

To maintain entities there you can configure the config-store property in
startup.properties:
# Location to store user entity configurations
*.config.store.uri=file://${falcon.home}/data/${falcon.app.type}-store

(I usually maintain a standard location to store entity configs and point
all my falcon to the same store)

After this it is pretty straight-forward. This is how you can migrate from
one falcon version to another :

1. Stop the old falcon instance. Install Falcon 0.9 on the same cluster as
the old one. Maintain the config-store property as defined above (in prism
as well as server)
2. Start falcon-0.9 and you should be able to list your entities. Consider
re-runing any failed/killed instances if required.

Note :
Two servers of falcon cannot co-exist in the same cluster as of now.

There is no documentation as of now. We will consider adding the same.

Thanks,
Pragya Mittal

On Fri, Feb 19, 2016 at 10:14 AM, Marek Wiewiorka <marek.wiewiorka@gmail.com
> wrote:

> Hi All - I've basically a question related to migration of entities between
> Falcon versions.
> I would like to upgrade Falcon from an old version to 0.9 by following such
> an procedure:
>
> 1)Install Falcon 0.9 on the same cluster as the old one (and have them both
> running at the same time)- 2 questions arise:
> a)is it possible at all and if so what should be configured: ports,
> anything else?
> b)how to backup the existing entities definition?
>
> 2) test a few of the processes using the new Falcon
> 3)migrate all of the processes to the new Falcon
> 4)Decommission the old Falcon installation
>
> Is there any document describing a migration procedure?
> The most import question for me now is the first one - how to run temporary
> 2 falcon instances
> on the same cluster for testing purposes? Is it safe?
>
> Many thanks in advance for any hints.
>
> Marek
>

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