shunping opened a new issue, #35771:
URL: https://github.com/apache/beam/issues/35771
### What happened?
```
import logging
import apache_beam as beam
from apache_beam.options.pipeline_options import PipelineOptions
from apache_beam.utils.timestamp import Timestamp
from apache_beam.utils.timestamp import MIN_TIMESTAMP, MAX_TIMESTAMP
from apache_beam.transforms.timeutil import TimeDomain
from apache_beam.transforms.userstate import TimerSpec, on_timer
logging.basicConfig(level=logging.INFO)
options = PipelineOptions([
"--environment_type=LOOPBACK",
"--runner=PrismRunner",
])
data = [(0, 0), (1, 1), (2, 0)]
class MyDoFn(beam.DoFn):
WINDOW_TIMER = TimerSpec('window_timer', TimeDomain.WATERMARK)
def __init__(self):
pass
def process(
self,
element,
window=beam.DoFn.WindowParam,
window_timer=beam.DoFn.TimerParam(WINDOW_TIMER),
):
print("process is called")
window_timer.set(window.end)
@on_timer(WINDOW_TIMER)
def on_timer(self, key=beam.DoFn.KeyParam):
import time
time.sleep(1)
yield "on_timer called on key %s" % str(key)
with beam.Pipeline(options=options) as p:
_ = (
p | beam.Create(data)
| beam.ParDo(MyDoFn())
| beam.LogElements(
level=logging.WARNING,
))
```
### Issue Priority
Priority: 2 (default / most bugs should be filed as P2)
### Issue Components
- [ ] Component: Python SDK
- [ ] Component: Java SDK
- [ ] Component: Go SDK
- [ ] Component: Typescript SDK
- [ ] Component: IO connector
- [ ] Component: Beam YAML
- [ ] Component: Beam examples
- [ ] Component: Beam playground
- [ ] Component: Beam katas
- [ ] Component: Website
- [ ] Component: Infrastructure
- [ ] Component: Spark Runner
- [ ] Component: Flink Runner
- [ ] Component: Samza Runner
- [ ] Component: Twister2 Runner
- [ ] Component: Hazelcast Jet Runner
- [ ] Component: Google Cloud Dataflow Runner
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