Chamikara Madhusanka Jayalath created BEAM-9620:
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Summary: textio (and fileio in general) takes too long to estimate
sizes of large globs
Key: BEAM-9620
URL: https://issues.apache.org/jira/browse/BEAM-9620
Project: Beam
Issue Type: Bug
Components: sdk-py-core
Reporter: Chamikara Madhusanka Jayalath
As a workaround we could introduce a way to not perform size estimation when
reading large globs. For example Java SDK has withHintMatchesManyFiles() option.
[https://github.com/apache/beam/blob/850e8469de798d45ec535fe90cb2dc5dbda4974a/sdks/java/core/src/main/java/org/apache/beam/sdk/io/TextIO.java#L371]
Additionally, seems like we are repeating the size estimation where the same
PCollection read from a file-based source is applied to multiple PTransforms.
See following for more details.
[https://stackoverflow.com/questions/60874942/avoid-recomputing-size-of-all-cloud-storage-files-in-gcsio-beam-python-sdk]
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