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From Karthik Ramasamy <kramas...@gmail.com>
Subject Re: Stateful Updates
Date Sat, 31 Mar 2018 03:05:15 GMT
Thanks Tom. It will be a great addition. Unable to access the doc. Could you give permission?

Sent from my iPhone

> On Mar 30, 2018, at 6:08 PM, Thomas Cooper <tom.n.cooper@gmail.com> wrote:
> Hi all,
> After chatting to the Heron Team at Twitter and Microsoft I have written up
> a proposal for giving Heron the ability to preserve state across a topology
> update (change in component parallelism). This is problem for components
> with incoming fields based connections as keys will not hash to the same
> task ID after an update. I have defined the problem (as I see it) and
> propsoed two solutions in the google doc below:
> https://docs.google.com/document/d/1X0pS9uwevn16nYYqrGjEvWQMWQLwti7Q0hmW6lmgyk8/edit?usp=sharing
> I would love to get feedback on these proposals. Feel free to blow holes in
> my assumptions and correct any misinterpretations I have made!
> Thanks,
> Tom Cooper
> W: www.tomcooper.org.uk  | Twitter: @tomncooper
> <https://twitter.com/tomncooper>

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