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https://issues.apache.org/jira/browse/BEAM-3247?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Neville Li resolved BEAM-3247.
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Resolution: Fixed
Fix Version/s: 2.2.0
> 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: Neville Li
> Priority: Minor
> Fix For: 2.2.0
>
>
> 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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