Github user JoshRosen commented on the pull request: https://github.com/apache/spark/pull/4371#issuecomment-73395298 According to the [Javadocs](http://docs.oracle.com/javase/7/docs/api/java/nio/charset/CharsetDecoder.html), `CharsetDecoder` is not thread-safe: `Instances of this class are not safe for use by multiple concurrent threads.`. This might explain the flakiness, so this LGTM.
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