Github user wingchen commented on the pull request:
https://github.com/apache/spark/pull/4146#issuecomment-71886664
@JoshRosen I found this one reading RDD from `sc.newAPIHadoopRDD` and
writing it back using `rdd.saveAsNewAPIHadoopFile`. It's only throwing
exceptions at the tuple part. That's why I though tuple was the reason.
But it seems that `multiple Java <-> Python conversions not working
correctly` was the real reason for it to fail. I am updating PR title,
description, and JIRA accordingly. Thanks
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