Chuan Yu Foo created BEAM-3737:
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Summary: Key-aware batching function
Key: BEAM-3737
URL: https://issues.apache.org/jira/browse/BEAM-3737
Project: Beam
Issue Type: New Feature
Components: beam-model
Reporter: Chuan Yu Foo
Assignee: Kenneth Knowles
I have a CombineFn for which add_input has very large overhead. I would like to
batch the incoming elements into a large batch before each call to add_input to
reduce this overhead. In other words, I would like to do something like:
{{elements | GroupByKey() | BatchElements() | CombineValues(MyCombineFn())}}
Unfortunately, BatchElements is not key-aware, and can't be used after a
GroupByKey to batch elements per key. I'm working around this by doing the
batching within CombineValues, which makes the CombineFn rather messy. It would
be nice if there were a key-aware BatchElements transform which could be used
in this context.
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