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https://issues.apache.org/jira/browse/SPARK-4094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14184897#comment-14184897
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Apache Spark commented on SPARK-4094:
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User 'liyezhang556520' has created a pull request for this issue:
https://github.com/apache/spark/pull/2956
> checkpoint should still be available after rdd actions
> ------------------------------------------------------
>
> Key: SPARK-4094
> URL: https://issues.apache.org/jira/browse/SPARK-4094
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 1.1.0
> Reporter: Zhang, Liye
>
> rdd.checkpoint() must be called before any actions on this rdd, if there is
> any other actions before, checkpoint would never succeed. For the following
> code as example:
> *rdd = sc.makeRDD(...)*
> *rdd.collect()*
> *rdd.checkpoint()*
> *rdd.count()*
> This rdd would never be checkpointed. But this would not happen for RDD
> cache. RDD cache would always make successfully before rdd actions no matter
> whether there is any actions before cache().
> So rdd.checkpoint() should also be with the same behavior with rdd.cache().
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