MAPREDUCE makes many endian-dependent assumptions

MAPREDUCE native code contains multiple uses of the bswap and bswap64 assembler functions (from hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-nativetask/src/main/native/src/lib/primitives.h).

primitives.h contains neither a sparc implementation of bswap nor a platform-independent C fallback implementation. In addition, byte swaps are nearly always made without checking if the platform is big or little endian, the assumption hard-coded throughout the source seems to be that the platform is little-endian. This most likely means that the MAPREDUCE native is currently code non-portable to big-endian platforms. The code needs to be examined carefully to determine which byte swaps are correct on all platforms and which are endian-dependent.