Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/10342#issuecomment-165315367
Note that LZ4 [does not support concatenation of serialized
streams](https://github.com/davies/spark/blob/14940de30480091618be8ca362c719c936685c4b/core/src/test/scala/org/apache/spark/io/CompressionCodecSuite.scala#L65),
meaning that sort-based shuffle won't be able to take advantage of a special
spill-merging optimization. This might not make a huge difference in practice
compared to the other speed benefits of LZ4.
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