GitHub user JoshRosen opened a pull request:
https://github.com/apache/spark/pull/3884
[SPARK-5063] Useful error messages for nested RDDs and actions inside of
transformations
This patch adds more helpful error messages for invalid programs that
define nested RDDs and performs actions inside of transformations (e.g. calling
`count()` from inside of `map()`). Currently, these invalid programs lead to
confusing NullPointerExceptions at runtime and have been a major source of
questions on the mailing list and StackOverflow.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/JoshRosen/spark SPARK-5063
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/3884.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #3884
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commit 15b2e6b38d9587790357182abe7918853688722e
Author: Josh Rosen <joshro...@databricks.com>
Date: 2015-01-03T04:14:27Z
[SPARK-5063] Useful error messages for nested RDDs and actions inside of
transformations
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