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https://issues.apache.org/jira/browse/BEAM-4620?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16523212#comment-16523212
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Kenneth Knowles commented on BEAM-4620:
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Perhaps [~jkff] or [~chamikara] can look.
> UnboundedReadFromBoundedSource.split() should always call split()
> -----------------------------------------------------------------
>
> Key: BEAM-4620
> URL: https://issues.apache.org/jira/browse/BEAM-4620
> Project: Beam
> Issue Type: Bug
> Components: beam-model
> Reporter: Josh M
> Priority: Minor
>
> If the source contains too little data (rounds the result down to 0), or if
> size estimation fails, then we don't call .split(). We must always call
> split(); instead of returning original source, we should have computed some
> fallback value for desiredBundleSize.
> This bug has existed since the code was first introduced, so it is not a
> regression - but it is certainly a bug.
>
> source:
> https://github.com/apache/beam/blob/697a1d17e473cd5b097aaaeee24c08f43cc77f58/runners/core-construction-java/src/main/java/org/apache/beam/runners/core/construction/UnboundedReadFromBoundedSource.java#L137
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