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https://issues.apache.org/jira/browse/SPARK-3628?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14227077#comment-14227077
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Matei Zaharia commented on SPARK-3628:
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FYI I merged this into 1.2.0, since the patch is now quite a bit smaller. We
should decide whether we want to back port it to branch-1.1, so I'll leave it
open for that reason. I don't think there's much point backporting it further
because the issue is somewhat rare, but we can do it if people ask for it.
> Don't apply accumulator updates multiple times for tasks in result stages
> -------------------------------------------------------------------------
>
> Key: SPARK-3628
> URL: https://issues.apache.org/jira/browse/SPARK-3628
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Reporter: Matei Zaharia
> Assignee: Nan Zhu
> Priority: Blocker
> Fix For: 1.2.0
>
>
> In previous versions of Spark, accumulator updates only got applied once for
> accumulators that are only used in actions (i.e. result stages), letting you
> use them to deterministically compute a result. Unfortunately, this got
> broken in some recent refactorings.
> This is related to https://issues.apache.org/jira/browse/SPARK-732, but that
> issue is about applying the same semantics to intermediate stages too, which
> is more work and may not be what we want for debugging.
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