[jira] [Updated] (SPARK-21268) Move some calculations to a distributed map in KMeans

["Guillaume Dardelet (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-21268?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Guillaume Dardelet updated SPARK-21268:
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    Summary: Move some calculations to a distributed map in KMeans  (was: Redundant collectAsMap in KMeans)

> Move some calculations to a distributed map in KMeans
> -----------------------------------------------------
>
>                 Key: SPARK-21268
>                 URL: https://issues.apache.org/jira/browse/SPARK-21268
>             Project: Spark
>          Issue Type: Improvement
>          Components: MLlib
>    Affects Versions: 2.0.0, 2.0.1, 2.0.2, 2.1.0, 2.1.1
>            Reporter: Guillaume Dardelet
>            Priority: Trivial
>              Labels: beginner, easyfix, newbie
>   Original Estimate: 1h
>  Remaining Estimate: 1h
>
> 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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