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https://issues.apache.org/jira/browse/BEAM-10517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17159515#comment-17159515
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Kenneth Knowles commented on BEAM-10517:
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Ah, actually I believe it would crash without getting to that point so it is
crash not data loss. I had fixed the crash and that made it look like data loss.
> DirectRunner drops null accumulators in multi-step combine
> ----------------------------------------------------------
>
> Key: BEAM-10517
> URL: https://issues.apache.org/jira/browse/BEAM-10517
> Project: Beam
> Issue Type: Bug
> Components: runner-direct
> Reporter: Kenneth Knowles
> Assignee: Kenneth Knowles
> Priority: P1
>
> When outputting accumulators in pre-combine, the direct runner iterates over
> a map of accumulators. However, since an accumulator can be null (such as in
> zetasketch) these accumulators will not be output.
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