[
https://issues.apache.org/jira/browse/SPARK-24034?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Emilio Dorigatti updated SPARK-24034:
-------------------------------------
Description:
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
was:
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
> StopIteration in pyspark mapper results in 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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