robertwb opened a new pull request, #32330:
URL: https://github.com/apache/beam/pull/32330
Formerly the coder used was always a url-excaped pickling[1] of windowed
values. This is quite inefficient in time and space.
The default (text) sink is modified to use base64 encoding to avoid embedded
newlines, and also has compression by defuault (which helps enormously in the
case of common windowing and timestamp metadata).
[1] The FastPrimitivesCoder is targeted at efficiently coding elements, not
windows or windowedvalues.
Also add compression to account for base64 expansion and (often) highly
repetative windowing metadata.
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