Hi all,

We are working on a streaming pipeline that we need to compatible with out 
legacy platform while we make the move over to Beam Streaming.
Our legacy platform uses a co-ordination framework (oozie). Each step is in the 
coordination pipeline is active by the creation of  a trigger file.

I am looking for a beam construct or flag that will notify the Context/ driver 
of the closure of a Time window. We need to enable to create a trigger flag 
only when all the files have been emitted
from set window period.

We have tried creating the trigger flag using the  PaneInfo.isLast() through a 
custom WindowFileNamePolicy. Noticed that a window has multiple Panes that will 
have isLast() as true.

Thanks,
Kyle

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