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google cloud dataflow - How can I improve performance of TextIO or AvroIO when reading a very large number of files?

TextIO.read() and AvroIO.read() (as well as some other Beam IO's) by default don't perform very well in current Apache Beam runners when reading a filepattern that expands into a very large number of files - for example, 1M files.

How can I read such a large number of files efficiently?

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