Github user tdas commented on the pull request:
https://github.com/apache/spark/pull/3798#issuecomment-72761134
In terms of number of classes, the abstract KafkaRDD is essentially
replacing HasOffsetRanges. There is no need for this HasOffsetRanges trait that
gets used only (assuming createRDD returns RDD[(K,V)]) inside
```
DStream.foreachRDD { rdd =>
val offsetRanges rdd.asInstaneOf[HasOffsetRanges].getOffsetRanges()
....
}
```
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