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https://issues.apache.org/jira/browse/SPARK-4562?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14222348#comment-14222348
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Apache Spark commented on SPARK-4562:
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User 'davies' has created a pull request for this issue:
https://github.com/apache/spark/pull/3420
> serialization in MLlib is slow
> ------------------------------
>
> Key: SPARK-4562
> URL: https://issues.apache.org/jira/browse/SPARK-4562
> Project: Spark
> Issue Type: Improvement
> Components: MLlib, PySpark
> Affects Versions: 1.2.0
> Reporter: Davies Liu
>
> There is a performance regression in test of GLM, it's introduced by
> serialization change.
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