shunping commented on issue #36145:
URL: https://github.com/apache/beam/issues/36145#issuecomment-3289834018
The sum behavior is the same when running a similar python pipeline.
```python
import logging
logging.basicConfig(level=logging.INFO)
import apache_beam as beam
from apache_beam.options.pipeline_options import PipelineOptions
from apache_beam import window
from apache_beam.transforms.trigger import AfterWatermark,
AfterProcessingTime, AccumulationMode, AfterCount
from apache_beam.transforms.window import FixedWindows
from apache_beam.transforms import trigger
import apache_beam as beam
from apache_beam import window
from apache_beam.transforms.trigger import AfterWatermark,
AfterProcessingTime, AccumulationMode, AfterCount
from apache_beam.transforms.window import FixedWindows
from apache_beam.transforms import trigger
from apache_beam.transforms.periodicsequence import PeriodicImpulse
from apache_beam.transforms.periodicsequence import RebaseMode
from apache_beam.utils.timestamp import Timestamp
from apache_beam.testing.test_stream import TestStream
# prism runner option
options = PipelineOptions([
"--streaming",
"--environment_type=LOOPBACK",
"--runner=PrismRunner",
#"--runner=PortableRunner", "--job_endpoint=localhost:8073",
#"--environment_type=LOOPBACK",
"--experiments=prism_enable_rtc",
#"--runner=PortableRunner", "--job_endpoint=localhost:8073",
"--prism_log_level=info",
# Unsafe trigger: `AfterProcessingTime(delay=1)` may lose data. Reason:
MAY_FINISH. This can be overriden with the --allow_unsafe_triggers flag.
"--allow_unsafe_triggers",
])
with beam.Pipeline(options=options) as p:
_ = (
p | TestStream().add_elements(elements=[1, 2, 3], event_timestamp=1000)
# .advance_watermark_to(2000)
# .add_elements(elements=[4, 5], event_timestamp=6000)
.advance_watermark_to(10000)
# .add_elements(elements=[10,], event_timestamp=52000)
# .advance_watermark_to(53000)
| 'window' >> beam.WindowInto(
FixedWindows(10 * 1000),
#trigger=trigger.Repeatedly(trigger.AfterCount(3)),
#trigger=trigger.AfterCount(2),
#trigger=trigger.AfterWatermark(early=trigger.AfterCount(4)),
#trigger=trigger.AfterWatermark(),
trigger=trigger.Always(),
accumulation_mode=trigger.AccumulationMode.DISCARDING)
| beam.CombineGlobally(sum).without_defaults()
| beam.LogElements(level=logging.WARNING,
with_timestamp=True, with_window=True, with_pane_info=True,
use_epoch_time=True))
```
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