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https://issues.apache.org/jira/browse/SPARK-677?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14200514#comment-14200514
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Matei Zaharia commented on SPARK-677:
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[~joshrosen] is this fixed now?
> PySpark should not collect results through local filesystem
> -----------------------------------------------------------
>
> Key: SPARK-677
> URL: https://issues.apache.org/jira/browse/SPARK-677
> Project: Spark
> Issue Type: Improvement
> Components: PySpark
> Affects Versions: 0.7.0
> Reporter: Josh Rosen
>
> Py4J is slow when transferring large arrays, so PySpark currently dumps data
> to the disk and reads it back in order to collect() RDDs. On large enough
> datasets, this data will spill from the buffer cache and write to the
> physical disk, resulting in terrible performance.
> Instead, we should stream the data from Java to Python over a local socket or
> a FIFO.
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