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https://issues.apache.org/jira/browse/BEAM-6906?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yueyang Qiu reassigned BEAM-6906:
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Assignee: (was: Yueyang Qiu)
> Mutating accumulators in fused stages is generally unsafe - need to provide a
> single mutable accumulator
> --------------------------------------------------------------------------------------------------------
>
> Key: BEAM-6906
> URL: https://issues.apache.org/jira/browse/BEAM-6906
> Project: Beam
> Issue Type: Bug
> Components: beam-model
> Reporter: Kenneth Knowles
> Priority: Critical
> Time Spent: 40m
> Remaining Estimate: 0h
>
> Our current docs encourage a CombineFn author to mutate accumulators for
> efficiency. This is important, but cannot be done generally without losing
> efficiency - it is not safe to share accumulators within a stage or across
> sliding windows. The ownership story needs to be clear. Any accumulator that
> is mutable is from that point on owned by the CombineFn, not the runner and
> cannot be given to other steps.
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