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Posted to issues@spark.apache.org by "Guillaume Dardelet (JIRA)" <ji...@apache.org> on 2017/06/30 13:39:00 UTC

[jira] [Created] (SPARK-21268) Redundant collectAsMap in KMeans

Guillaume Dardelet created SPARK-21268:
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             Summary: Redundant collectAsMap in KMeans
                 Key: SPARK-21268
                 URL: https://issues.apache.org/jira/browse/SPARK-21268
             Project: Spark
          Issue Type: Improvement
          Components: MLlib
    Affects Versions: 2.1.1, 2.1.0, 2.0.2, 2.0.1, 2.0.0
            Reporter: Guillaume Dardelet
            Priority: Trivial


As I was monitoring the perfomance of my algorithm with SparkUI, I noticed that their was a "collectAsMap" operation that was done hundreds of time at every iteration of Kmeans:

https://github.com/apache/spark/blob/master/mllib/src/main/scala/org/apache/spark/mllib/clustering/KMeans.scala#L295

It would work just as well by performing the following "foreach" on the RDD, and would slightly improve perfomance.

Thoughts ?



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