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https://issues.apache.org/jira/browse/BEAM-373?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15348524#comment-15348524
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Kenneth Knowles commented on BEAM-373:
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False - just a readability issue. There is a {{break}} that is never reached if
it isn't a {{Reiterator}}.
> CoGbkResult will crash after 10,000 elements on any runner that does not
> provide a Reiterator
> ---------------------------------------------------------------------------------------------
>
> Key: BEAM-373
> URL: https://issues.apache.org/jira/browse/BEAM-373
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-core
> Reporter: Kenneth Knowles
> Assignee: Thomas Groh
> Priority: Critical
>
> Unless I am reading this wrong, there is a hardcoded downcast to
> {{Reiterator}} after 10,000 elements. This appears to be an assumption built
> in from the early days. (discovered while trying to decide whether
> {{Reiterator}} should live in the SDK or runner-core)
> I will throw together a test shortly to confirm.
> https://github.com/apache/incubator-beam/blob/master/sdks/java/core/src/main/java/org/apache/beam/sdk/transforms/join/CoGbkResult.java#L122
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