Github user davies commented on the issue: https://github.com/apache/spark/pull/15632 Thanks to @viirya, this is a false alarm, I will continue to looking for the real cause. @srowen The reason we have a fork here is that the upstream does not support concated stream, we send a patch for it a year ago but that is still open. We have some tests to cover concated stream on Spark side (not a unit test for LZ4).
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