Rupsa1234 commented on issue #34188:
URL: https://github.com/apache/beam/issues/34188#issuecomment-2704418286
Thanks for reporting this issue! I have also encountered the same problem
where `WriteToCsv` does not respect the `num_shards` parameter, causing all
data to be written to a single file instead of multiple shards.
I tested this with Apache Beam Python SDK 2.49.0 on Google Dataflow Runner
and observed:
- Expected: `output-00000-of-00005.csv`, `output-00001-of-00005.csv`, etc.
- Actual: Only one `output.csv` file is generated.
Workaround:
Using WriteToText instead solves the issue:
p | "Write to Text" >> beam.io.WriteToText("output",
file_name_suffix=".csv", num_shards=5)
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