Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/1082#issuecomment-50356856
> Separately, when I tried to call `id()` on a mapped RDD, it gives me an
error:
This is a known issue,
[SPARK-2334](https://issues.apache.org/jira/browse/SPARK-2334) and there's an
open pull request (#1276) for it. I'll try to review or fix that issue in the
next few days.
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