damccorm opened a new issue, #20676:
URL: https://github.com/apache/beam/issues/20676
In this case all message from Pub/Sub topic need accumulate in one text
file per window, however WriteToFiles produce many file instead one
```
input = (p
| 'ReadData' >>
beam.io.ReadFromPubSub(topic=known_args.input_topic).with_output_types(bytes)
| "Decode" >> beam.Map(lambda x: x.decode('utf-8'))
| 'Parse' >> beam.Map(parse_json)
| 'Data w' >> beam.WindowInto(
FixedWindows(60),
trigger=trigger.AfterWatermark(),
accumulation_mode=AccumulationMode.DISCARDING
)
| 'Group elements into windows' >> beam.Reshuffle()
)
event_data = (input
| 'Filter events' >> beam.Filter(lambda x: x['t']
== 'event')
| 'Encode ' >> beam.Map(lambda x: json.dumps(x))
| 'Write to
file's' >> fileio.WriteToFiles(
path='gs://some/gcs/bucket/',
file_naming=fileio.default_file_naming(
prefix='events',
suffix='.txt'
),
shards=1
)
)
```
Imported from Jira
[BEAM-10998](https://issues.apache.org/jira/browse/BEAM-10998). Original Jira
may contain additional context.
Reported by: andy_ap.
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