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https://issues.apache.org/jira/browse/SPARK-6055?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14339846#comment-14339846
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Apache Spark commented on SPARK-6055:
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User 'davies' has created a pull request for this issue:
https://github.com/apache/spark/pull/4809
> memory leak in pyspark sql
> --------------------------
>
> Key: SPARK-6055
> URL: https://issues.apache.org/jira/browse/SPARK-6055
> Project: Spark
> Issue Type: Bug
> Components: PySpark, SQL
> Affects Versions: 1.1.1, 1.3.0, 1.2.1
> Reporter: Davies Liu
> Assignee: Davies Liu
> Priority: Blocker
>
> The __eq__ of DataType is not correct, class cache is not use correctly
> (created class can not be find by dataType), then it will create lots of
> classes (saved in _cached_cls), never released.
> Also, all same DataType have same hash code, there will be many object in a
> dict with the same hash code, end with hash attach, it's very slow to access
> this dict (depends on the implementation of CPython).
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