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From Timo Walther <twal...@apache.org>
Subject Re: Emitting current state to a sink
Date Fri, 26 Apr 2019 08:48:33 GMT
Hi Avi,

did you have a look at the .connect() and .broadcast() API 
functionalities? They allow you to broadcast a control stream to all 
operators. Maybe this example [1] or other examples in this repository 
can help you.



Am 26.04.19 um 07:57 schrieb Avi Levi:
> Hi,
> We have a keyed pipeline with persisted state.
> Is there a way to broadcast a command and collect all values that 
> persisted in  the state ?
> The end result can be for example sending a fetch command to all 
> operators and emitting the results to some sink
> why do we need it ? from time to time we might want to check if we are 
> missing keys what are the additional keys or simply emit the current 
> state to a table and to query it.
> I tried simply broadcasting a command and addressing the persisted 
> state but that resulted with:
> java.lang.NullPointerException: No key set. This method should not be 
> called outside of a keyed context.
> is there a good way to achieve that ?
> Cheers
> Avi

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