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https://issues.apache.org/jira/browse/SPARK-22681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16276718#comment-16276718
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Apache Spark commented on SPARK-22681:
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User 'carsonwang' has created a pull request for this issue:
https://github.com/apache/spark/pull/19877
> Accumulator should only be updated once for each task in result stage
> ---------------------------------------------------------------------
>
> Key: SPARK-22681
> URL: https://issues.apache.org/jira/browse/SPARK-22681
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 2.2.0
> Reporter: Carson Wang
>
> As the doc says "For accumulator updates performed inside actions only, Spark
> guarantees that each task’s update to the accumulator will only be applied
> once, i.e. restarted tasks will not update the value."
> But currently the code doesn't guarantee this.
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