Alan Burlison created MAPREDUCE-6397:
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Summary: MAPREDUCE makes many endian-dependent assumptions
Key: MAPREDUCE-6397
URL: https://issues.apache.org/jira/browse/MAPREDUCE-6397
Project: Hadoop Map/Reduce
Issue Type: Sub-task
Affects Versions: 2.7.0
Environment: 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.
Reporter: Alan Burlison
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