Hi there,
We have the following setup:
* we have a generic operator that's processing tuples in its input port
* in the input port's process method, we check for a condition, and:
* if the condition is met, the tuple is emitted to the next operator
right away (in the process method)
* Otherwise, if the condition is not met, we store the tuple in some
cache and we use some threads that periodically check the condition to become
true. Once the condition is true, the threads call the emit method on the
stored tuples.
With this setup, we occasionally encounter the following error:
2017-02-15 17:29:09,364 ERROR com.datatorrent.stram.engine.GenericNode:
Catastrophic Error: Out of sequence BEGIN_WINDOW tuple 58a4046100003b7f on port
transformedJSON while expecting 58a4046100003b7e
Is there a way to make the above work correctly?
If not, can you recommend a better way of doing this?
How can we ensure window assignment is done synchronously before emitting
tuples ?
Thanks very much in advance...
-allan
