I agree it looks like a bug. Filed
https://issues.apache.org/jira/browse/BEAM-6934



On Thu, Mar 28, 2019 at 5:18 PM Reuven Lax <re...@google.com> wrote:

> This looks like a bug to me.
>
> On Thu, Mar 28, 2019 at 2:52 PM Amar Pai <a...@lyft.com> wrote:
>
>> Hi,
>>
>> I'm running into some unexpected behavior when trying to unit test a
>> stateful DoFn that uses watermark timers as well as bag state.  I'm
>> following the example here:
>> https://github.com/apache/beam/blob/master/sdks/python/apache_beam/transforms/userstate_test.py#L333
>>
>> Expected behavior:
>> When using TestStream, if a stateful DoFn adds value 'foo' to BagState
>> then sets two watermark timers t1 and t2, where t1 clears the bag state and
>> t2 reads from bag state and emits the contents, if t1.time < t2.time then
>> nothing should get emitted when the TestPipeline is run. (bag state should
>> be cleared by timer at t1 before it is read from by timer at t2)
>>
>> Actual behavior:
>> For the scenario described above, results get emitted despite t1.time
>> being less than t2.time.
>> I've created a gist with a demonstration of the problem:
>> https://gist.github.com/jcruelty/3bf5ce5865110372a2d1650b1421cde1
>>
>>
>> Is this a bug?  Would appreciate your thoughts.
>> cheers
>>
>> Amar
>>
>

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