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https://issues.apache.org/jira/browse/SPARK-12026?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-12026:
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Assignee: Apache Spark
> ChiSqTest gets slower and slower over time when number of features is large
> ---------------------------------------------------------------------------
>
> Key: SPARK-12026
> URL: https://issues.apache.org/jira/browse/SPARK-12026
> Project: Spark
> Issue Type: Bug
> Components: MLlib
> Affects Versions: 1.5.2
> Reporter: Hunter Kelly
> Assignee: Apache Spark
> Labels: mllib, stats
> Attachments: First Stages.png, Latest Stages.png
>
>
> I've been running a ChiSqTest to pick features for feature reduction. My
> understanding is that internally it creates jobs to run on batches of 1000
> features at a time.
> I was under the impression that the features are treated as independant, but
> this does not appear to be the case. When the number of features is large
> (160k in my case), each batch gets slower and slower. As an example, running
> on 25 m3.2xlarges on Amazon EMR, it started at just over 1 minute per batch.
> By the end, batches were taking over 30 minutes per batch.
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