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From Elias Levy <fearsome.lucid...@gmail.com>
Subject Multiple stream operator watermark handling
Date Thu, 24 May 2018 14:07:06 GMT
Is there mechanism for a multiple stream operator to ignore watermarks from
one of the streams?

The use case is a multiple stream operator that consumes a primary stream
and a secondary control stream.  The control stream may only receive
messages in rare occasion, and possibly never.  The default behavior of the
operator is to only emit the lowest of the last watermark received from
each input stream.  That means that event time fails to advance if there
are no control messages.

I also notice that FLIP-17, the Side Input proposal, does not address this
issue, either in the Wiki or in the Google Docs.

Assuming there is no currently prescribed way to handle this, are folks
taking care of this by introducing a new Assigner after the multiple input
operator to generate watermarks?

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