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https://issues.apache.org/jira/browse/SPARK-20943?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16034296#comment-16034296
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Saisai Shao commented on SPARK-20943:
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I think the original purpose of comment is to say {{Aggregator}} and
{{Ordering}} is not used in map side shuffle write, those {{Aggregator}}
{{Ordering}} set in ShuffleRDD will only be used in shuffle reader side.
> Correct BypassMergeSortShuffleWriter's comment
> ----------------------------------------------
>
> Key: SPARK-20943
> URL: https://issues.apache.org/jira/browse/SPARK-20943
> Project: Spark
> Issue Type: Improvement
> Components: Documentation, Shuffle
> Affects Versions: 2.1.1
> Reporter: CanBin Zheng
> Priority: Trivial
> Labels: starter
>
> There are some comments written in BypassMergeSortShuffleWriter.java about
> when to select this write path， the three required conditions are described
> as follows:
> 1. no Ordering is specified, and
> 2. no Aggregator is specified, and
> 3. the number of partitions is less than
> spark.shuffle.sort.bypassMergeThreshold
> Obviously, the conditions written are partially wrong and misleading, the
> right conditions should be:
> 1. map-side combine is false, and
> 2. the number of partitions is less than
> spark.shuffle.sort.bypassMergeThreshold
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