Liang-Chi Hsieh created SPARK-28933:
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Summary: 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
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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