Josh Rosen created SPARK-5063:
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Summary: Raise more helpful errors when SparkContext methods are
called inside of transformations
Key: SPARK-5063
URL: https://issues.apache.org/jira/browse/SPARK-5063
Project: Spark
Issue Type: Improvement
Components: Spark Core
Reporter: Josh Rosen
Assignee: Josh Rosen
Spark does not support nested RDDs or performing Spark actions inside of
transformations; this usually leads to NullPointerExceptions (see SPARK-718 as
one example). The confusing NPE is one of the most common sources of Spark
questions on StackOverflow:
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https://stackoverflow.com/questions/13770218/call-of-distinct-and-map-together-throws-npe-in-spark-library/14130534#14130534
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https://stackoverflow.com/questions/23793117/nullpointerexception-in-scala-spark-appears-to-be-caused-be-collection-type/23793399#23793399
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https://stackoverflow.com/questions/25997558/graphx-ive-got-nullpointerexception-inside-mapvertices/26003674#26003674
(those are just a sample of the ones that I've answered personally; there are
many others).
I think that we should add some logic to attempt to detect these sorts of
errors: we can use a DynamicVariable to check whether we're inside a task and
throw more useful errors when the RDD constructor is called from inside a task
or when the SparkContext job submission methods are called.
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