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Posted to issues@spark.apache.org by "Liang-Chi Hsieh (Jira)" <ji...@apache.org> on 2019/08/30 23:32:00 UTC

[jira] [Created] (SPARK-28933) Reduce unnecessary shuffle in ALS when initializing factors

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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