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From Akshay Aggarwal <akshay.aggar...@flipkart.com>
Subject Persisting inactive state outside Flink
Date Fri, 14 Feb 2020 17:05:10 GMT
Hi,

We have a use case where we have to persist some state information about a
device forever. Each new event will fetch the keyed state and update it.
And this has to be applied in-order of events.

The problem is that the number of devices (keys) will keep growing
infinitely. Usually a device comes online, stays active for a while
(generates new events) and then goes into dormant mode. Is there a way we
can persist the state outside of Flink (say HBase) when the device goes
dormant and later fetch when it's activated?

I know we can do this in process function using timers. But here I'll have
to make a synchronous call to the external store every time a new device
comes live, or when an active device goes dormant, which will stall the
task and become a scalability bottleneck. Using AsyncIO also doesn't seem
to be an option.

Is there a way to achieve this without hacking into Flink code?

Thanks,
Akshay Aggarwal

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