Neville Li created BEAM-3247:
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Summary: Sample.any memory constraint
Key: BEAM-3247
URL: https://issues.apache.org/jira/browse/BEAM-3247
Project: Beam
Issue Type: Improvement
Components: sdk-java-core
Affects Versions: 2.1.0
Reporter: Neville Li
Assignee: Kenneth Knowles
Priority: Minor
Right now {{Sample.any}} converts the collection to an iterable view and take
first n in a side input. This may require materializing the entire collection
to disk and is potentially inefficient.
https://github.com/apache/beam/blob/v2.1.0/sdks/java/core/src/main/java/org/apache/beam/sdk/transforms/Sample.java#L74
It can be fixed by applying a truncating `DoFn` first, then a combine into
`List<T>` which limits the list size, and finally flattening the list.
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