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Posted to issues@beam.apache.org by "Chamikara Madhusanka Jayalath (Jira)" <ji...@apache.org> on 2020/03/27 00:30:00 UTC

[jira] [Created] (BEAM-9620) textio (and fileio in general) takes too long to estimate sizes of large globs

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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