Github user CodingCat commented on the pull request:
https://github.com/apache/spark/pull/10841#issuecomment-173424483
In docs, you need to remove the following sentence
> For accumulator updates performed inside actions only, Spark guarantees
that each taskâs update to the accumulator will only be applied once, i.e.
restarted tasks will not update the value. In transformations, users should be
aware of that each taskâs update may be applied more than once if tasks or
job stages are re-executed.
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