lostluck opened a new pull request, #22904:
URL: https://github.com/apache/beam/pull/22904
Fixes #22900
This adds one time use stream decoders for use whenever we know reiterations
won't occur (see issue).
Adds tests, and improves test coverage with a datasource tests for the
various iterator handlers (on demand and fixed), unit tests for the on demand
decode streams, a new test for pardo short reads, and a primitives test for GBK
short reads.
Fixes previous benign issue where value iteration streams were not being
closed after the processing DoFn finished, and test for same. Since we always
fully read the byte stream for a value, we never ran into a short read problem
before. Streaming decode short reads on the data side would cause problems that
don't occur with short reads for Side Inputs.
There's a followup task for optimizing short reads when the coder being used
is length prefixed, filed in #22901.
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