Daniel Lescohier created BEAM-6952:
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Summary: concatenated compressed files bug with python sdk
Key: BEAM-6952
URL: https://issues.apache.org/jira/browse/BEAM-6952
Project: Beam
Issue Type: Bug
Components: sdk-py-core
Affects Versions: 2.11.0
Reporter: Daniel Lescohier
The Python apache_beam.io.filesystem module has a bug handling concatenated
compressed files.
The PR I will create has two commits:
# a new unit test that shows the problem
# a fix to the problem.
The unit test is added to the apache_beam.io.filesystem_test module. It was
added to this module because the test:
apache_beam.io.textio_test.test_read_gzip_concat does not encounter the problem
in the Beam 2.11 and earlier code base because the test data is too small: the
data is smaller than read_size, so it goes through logic in the code that
avoids the problem in the code. So, this test sets read_size smaller and test
data bigger, in order to encounter the problem. It would be difficult to test
in the textio_test module, because you'd need very large test data because
default read_size is 16MiB, and the ReadFromText interface does not allow you
to modify the read_size.
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