Github user mxm commented on the pull request:
https://github.com/apache/flink/pull/290#issuecomment-69723062
@uce `DataInputDeserializer.setBuffer(ByteBuffer)` doesn't seem relevent
for this pull request. The check for the direct byte buffer is not necessary
since it is always called with ByteBuffers allocated from heap memory. These
buffers are relatively small sized and probably much quicker allocated on the
JVM heap than outside.
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