Thomas Weise created BEAM-7127:
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             Summary: Timer parameter not supported in timer callback
                 Key: BEAM-7127
                 URL: https://issues.apache.org/jira/browse/BEAM-7127
             Project: Beam
          Issue Type: Bug
          Components: sdk-py-harness
    Affects Versions: 2.12.0
            Reporter: Thomas Weise


Referencing the timer in its on_timer callback produces a recursive pickle 
error.  
{code:java}
@userstate.on_timer(timer_spec)
def process_timer(self, timer_1=beam.DoFn.TimerParam(timer_spec)):
{code}
Unit test: 
[https://github.com/apache/beam/blob/cbe4dfbdbe5d0da5152568853ee5e17334dd1b54/sdks/python/apache_beam/transforms/userstate_test.py#L67]
 



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