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From Gyula Fóra <gyf...@apache.org>
Subject Re: Keep Model in Operator instance up to date
Date Wed, 19 Aug 2015 07:05:09 GMT
Hey!

I think it is safe to say that the best approach in this case is creating a
co-flatmap that will receive updates on one input. The events should
probably be broadcasted in this case so you can check in parallel.

This approach can be used effectively with Flink's checkpoint mechanism,
while external model updates would be tricky to keep consistent.

Cheers,
Gyula




On Wed, Aug 19, 2015 at 8:44 AM Welly Tambunan <if05041@gmail.com> wrote:

> Hi All,
>
> We have a streaming computation that required to validate the data stream
> against the model provided by the user.
>
> Right now what I have done is to load the model into flink operator and
> then validate against it. However the model can be updated and changed
> frequently. Fortunately we always publish this event to RabbitMQ.
>
> I think we can
>
>
>    1. Create RabbitMq listener for model changed event from inside the
>    operator, then update the model if event arrived.
>
>    But i think this will create race condition if not handle correctly
>    and it seems odd to keep this
>
>    2. We can move the model into external in external memory cache
>    storage and keep the model up to date using flink. So the operator will
>    retrieve that from memory cache
>
>    3. Create two stream and using co operator for managing the shared
>    state.
>
>
> What is your suggestion on keeping the state up to date from external
> event ? Is there some kind of best practice for maintaining model up to
> date on streaming operator ?
>
> Thanks a lot
>
>
> Cheers
>
>
> --
> Welly Tambunan
> Triplelands
>
> http://weltam.wordpress.com
> http://www.triplelands.com <http://www.triplelands.com/blog/>
>

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