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From Maciej Bryński (JIRA) <j...@apache.org>
Subject [jira] [Comment Edited] (SPARK-16321) Pyspark 2.0 performance drop vs pyspark 1.6
Date Tue, 19 Jul 2016 13:14:20 GMT

    [ https://issues.apache.org/jira/browse/SPARK-16321?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15383889#comment-15383889
] 

Maciej Bryński edited comment on SPARK-16321 at 7/19/16 1:13 PM:
-----------------------------------------------------------------

Thanks.
It works for PushedFilter ([GreaterThan(id,9000000)])
But it's not the reason. 
Time of execution is the same as with IsNotNull predicate.

I have no more ideas.


was (Author: maver1ck):
Thanks.
It works for PushedFilter ([GreaterThan(id,9000000)])
But it's not the reason. 
Time of execution is the same as with IsNotNull predicate.

> Pyspark 2.0 performance drop vs pyspark 1.6
> -------------------------------------------
>
>                 Key: SPARK-16321
>                 URL: https://issues.apache.org/jira/browse/SPARK-16321
>             Project: Spark
>          Issue Type: Bug
>          Components: PySpark
>    Affects Versions: 2.0.0
>            Reporter: Maciej Bryński
>         Attachments: Spark16.nps, Spark2.nps, spark16._trace.png, spark16_query.nps,
spark2_nofilterpushdown.nps, spark2_query.nps, spark2_trace.png, visualvm_spark16.png, visualvm_spark2.png,
visualvm_spark2_G1GC.png
>
>
> I did some test on parquet file with many nested columns (about 30G in
> 400 partitions) and Spark 2.0 is 2x slower.
> {code}
> df = sqlctx.read.parquet(path)
> df.where('id > some_id').rdd.flatMap(lambda r: [r.id] if not r.id %100000 else []).collect()
> {code}
> Spark 1.6 -> 2.3 min
> Spark 2.0 -> 4.6 min (2x slower)
> I used BasicProfiler for this task and cumulative time was:
> Spark 1.6 - 4300 sec
> Spark 2.0 - 5800 sec
> Should I expect such a drop in performance ?
> I don't know how to prepare sample data to show the problem.
> Any ideas ? Or public data with many nested columns ?



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