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https://issues.apache.org/jira/browse/SPARK-28933?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16920584#comment-16920584
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Liang-Chi Hsieh commented on SPARK-28933:
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This issue was resolved by [https://github.com/apache/spark/pull/25639].
> Reduce unnecessary shuffle in ALS when initializing factors
> -----------------------------------------------------------
>
> Key: SPARK-28933
> URL: https://issues.apache.org/jira/browse/SPARK-28933
> Project: Spark
> Issue Type: Improvement
> Components: ML
> Affects Versions: 3.0.0
> Reporter: Liang-Chi Hsieh
> Assignee: Liang-Chi Hsieh
> Priority: Major
>
> When Initializing factors in ALS, we should use {{mapPartitions}} instead of
> current {{map}}, so we can preserve existing partition of the RDD of
> {{InBlock}}. The RDD of {{InBlock}} is already partitioned by src block id.
> We don't change the partition when initializing factors.
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