Github user rtudoran commented on the issue:
https://github.com/apache/flink/pull/3641
@fhueske
I just thought of an example. Assume you have 2 events coming at
consecutime processintimes
Ev1,1
Ev2, 2
When ev1 arrives you accumulate it and register the timer at proctime +1 to
emit it. However when ontimer would be called also the processelement is
called. This might lead to some concurrent access for accessing the accumulator
as one function needs to read it while the other needs to modify it. Is there a
clear order for the execution in such concurrent scenarios?
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