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https://issues.apache.org/jira/browse/SPARK-6288?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14522743#comment-14522743
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Xiangrui Meng commented on SPARK-6288:
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[~joshrosen] Are we going to upgrade Pyrolite in 1.4? It seems to bring
significant performance improvement by disabling `useMemo`.
> Pyrolite calls hashCode to cache previously serialized objects
> --------------------------------------------------------------
>
> Key: SPARK-6288
> URL: https://issues.apache.org/jira/browse/SPARK-6288
> Project: Spark
> Issue Type: Improvement
> Components: PySpark
> Affects Versions: 1.0.2, 1.1.1, 1.2.1, 1.3.0
> Reporter: Xiangrui Meng
> Assignee: Josh Rosen
> Attachments: Screen Shot 2015-03-13 at 10.45.35 AM.png
>
>
> https://github.com/irmen/Pyrolite/blob/v2.0/java/src/net/razorvine/pickle/Pickler.java#L140
> This operation could be quite expensive, compared to serializing the object
> directly, because hashCode usually needs to access all data stored in the
> object. Maybe we should disable this feature by default.
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