Github user mateiz commented on the pull request:
https://github.com/apache/spark/pull/1338#issuecomment-50112244
BTW you can try WritableUtils.clone. At some point we tried cloning data by
default in hadoopRDD, or having a flag for it, and we gave up because it didn't
seem to work for every InputFormat. But it's probably worth a shot here if the
object extends Writable.
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