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From "Matthias J. Sax" <mj...@apache.org>
Subject Re: synchronizing two streams
Date Thu, 12 May 2016 11:31:42 GMT
I cannot follow completely. TwoInputStreamOperators defines two methods
to process watermarks for each stream.

So you can sync both stream within your outer join operator you plan to


On 05/11/2016 05:00 PM, Alexander Gryzlov wrote:
> Hello,
> We're implementing a streaming outer join operator based on a
> TwoInputStreamOperator with an internal buffer. In our use-case only the
> items whose timestamps are within a several-second interval of each
> other can join, so we need to synchronize the two input streams to
> ensure maximal yield. Our plan is to utilize the watermark mechanism to
> implement some sort of a "throttling" operator, which would take two
> streams and stop passing through one of them based on the watermarks in
> another. However, there doesn't seem to exist an operator of the shape
> (A,B)->(A,B) in Flink, where A and B can be received and emitted
> independently. What would be a resource-saving way to implement such
> (e.g., without spawning two more parallel TwoInputStreamOperators)?
> Alex

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