Github user kanzhang commented on the pull request:
https://github.com/apache/spark/pull/1338#issuecomment-50202364
Just wanted to make sure my understanding is correct, calling
```RDD.first()``` doesn't materialize (read in) the full RDD, right? I saw a
```first``` being called within ```SerDeUtil.pairRDDToPython``` and was
wondering if I could ```unpersist``` the broadcasted Hadoop conf after that and
before returning from ```PythonRDD.sequenceFile```?
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