Weichen Xu created SPARK-19215:
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Summary: Add necessary check for `RDD.checkpoint` to avoid
potential mistakes
Key: SPARK-19215
URL: https://issues.apache.org/jira/browse/SPARK-19215
Project: Spark
Issue Type: Improvement
Components: Spark Core
Reporter: Weichen Xu
Currently RDD.checkpoint must be called before any job executed on this RDD,
otherwise the `doCheckpoint` will never be called. This is a pitfall we should
check this and throw exception (or at least log warning ? ) for such case.
And, if RDD haven't been persisted, doing checkpoint will cause RDD
recomputation, because current implementation will run separated job for
checkpointing. I think such case it should also print some warning message,
remind user to check whether he forgot persist the RDD.
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