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Posted to issues@spark.apache.org by "Emilio Dorigatti (JIRA)" <ji...@apache.org> on 2018/04/22 15:28:00 UTC
[jira] [Resolved] (SPARK-24034) StopIteration in pyspark mapper
gives partial results
[ https://issues.apache.org/jira/browse/SPARK-24034?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Emilio Dorigatti resolved SPARK-24034.
--------------------------------------
Resolution: Duplicate
> StopIteration in pyspark mapper gives partial results
> -----------------------------------------------------
>
> Key: SPARK-24034
> URL: https://issues.apache.org/jira/browse/SPARK-24034
> Project: Spark
> Issue Type: Bug
> Components: PySpark
> Affects Versions: 2.3.0
> Reporter: Emilio Dorigatti
> Priority: Major
>
> Consider the following code
> {noformat}
> def mapper(xx):
> if xx % 2 == 0:
> raise StopIteration()
> else:
> return xx
> sc.parallelize(range(100)).map(mapper).collect()
> {noformat}
> The result I get is {{[57, 71, 85]}}
> I think it happens because {{map}} is implemented in terms of {{mapPartitionsWithIndex}} using a custom iterator, so the {{StopIteration}} raised by the mapper is handled by that iterator. I think this should be raised to the user instead.
> I think I can take care of this, if I am allowed to (first time I contribute, not sure how it works)
> NB: this may be the underlying cause of https://issues.apache.org/jira/browse/SPARK-23754
>
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