Github user kanzhang commented on the pull request:
https://github.com/apache/spark/pull/1082#issuecomment-50289956
OK, maybe the above scenario is a little far fetched -- since RDD id is
just a number, it's hard to recollect which RDD the number corresponds to
(unless the user wants to unpersist all of them).
Separately, when I tried to call ```id()``` on a mapped RDD, it gives me an
error:
```
AttributeError: 'PipelinedRDD' object has no attribute '_id'
```
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