[jira] [Created] (SPARK-19215) Add necessary check for `RDD.checkpoint` to avoid potential mistakes

["Weichen Xu (JIRA)" <ji...@apache.org>]

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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