Yarn Load local library Throw unable to load Native-hadoop library how to Troubleshoot

With the official Hadoop 2.1.0-beta installed, every time the Hadoop command goes in, it throws a warning

WARN util. nativecodeloader:unable to load Native-hadoop library for your platform ... using Builtin-java classes where applicable

Set the logger level to see the specific reason

Export Hadoop_root_logger=debug,console

The 
 13/08/29 13:59:38 DEBUG util.  
Nativecodeloader:trying to load the custom-built Native-hadoop library ... 13/08/29 13:59:38 DEBUG util. nativecodeloader:failed to load Native-hadoop with Error:java.lang.UnsatisfiedLinkError:/usr/local/hadoop/ hadoop-2.1.0-beta/lib/native/libhadoop.so.1.0.0:/usr/local/hadoop/hadoop-2.1.0-beta/lib/native/ Libhadoop.so.1.0.0:wrong ELF class:elfclass32 (Possible cause:architecture Word width mismatch) 13/08/29 13:59:38 DEB UG util. nativecodeloader:java.library.path=/usr/local/hadoop/hadoop-2.1.0-beta/lib/native/linux-amd64-64:/usr/local/ Hadoop/hadoop-2.1.0-beta/lib/native 13/08/29 13:59:38 WARN util. nativecodeloader:unable to load Native-hadoop library for your platform ... using Builtin-java classes where applicable

Wrong ELFCLASS32, could it be that the loaded so file system version is wrong
Execute command File libhadoop.so.1.0.0
Libhadoop.so.1.0.0:elf 32-bit LSB Shared object, Intel 80386, version 1 (SYSV), dynamically linked, not stripped
It's 80386, it's a 32-bit system version, and my Hadoop environment is 64-bit OS
Originally downloaded from the Apache image of the compiled Hadoop version of the native library are version 32, if you want to support the 64-bit version, you must recompile, this is a bit of a pit dad, you know, almost all production environment is 64-bit OS
Yarn's official statement to the native library validates this.
"The pre-built 32-bit i386-linux native Hadoop library is available as part of the Hadoop distribution and are located in T He lib/native directory "

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Re-checkout source code
SVN checkout http://svn.apache.org/repos/asf/hadoop/common/tags/release-2.1.0-beta/
Plus the option to compile native, the compile-time will produce the corresponding native library based on the current operating system architecture
MVN Package-pdist,native-dskiptests-dtar
Then go to native file to see all the files type, is already 64-bit version of the, replace the online file, warning eliminate

File *  
libhadoop.a: current        ar archive  
libhadooppipes.a: current   ar archive  
libhadoop.so:       Symbolic link to ' libhadoop.so.1.0.0 '  
libhadoop.so.1.0.0:elf 64-bit LSB Shared Object, x86-64, version 1 (gnu/linux), Dynamically linked, not stripped  
libhadooputils.a: current   ar archive libhdfs.a  
: current          ar Archive  
libhdfs.so:         symbolic link to ' libhdfs.so.0.0.0 '  
libhdfs.so.0.0.0:   ELF 64-bit LSB shared Object, x86-64, version 1 (gnu/linux), dynamically linked, not stripped

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