hadoop-2.2.0警告 (Unable to loadnative-hadoop library for your platform... using ...)

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hadoop-2.2.0 配置完成，但是运行hadoop老是警告：

WARN util.NativeCodeLoader: Unable to loadnative-hadoop library for your platform... using builtin-java classes whereapplicable

这是由于本地库与64位系统版本不一致导致。

查看本地库：

hadoop@hhost01:~/hadoop-2.2.0/lib/native$ file *libhadoop.a:        current ar archivelibhadooppipes.a:   current ar archivelibhadoop.so:       symbolic link to `libhadoop.so.1.0.0'libhadoop.so.1.0.0: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, BuildID[sha1]=0x9eb1d49b05f67d38454e42b216e053a27ae8bac9, not strippedlibhadooputils.a:   current ar archivelibhdfs.a:          current ar archivelibhdfs.so:         symbolic link to `libhdfs.so.0.0.0'libhdfs.so.0.0.0:   ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, BuildID[sha1]=0x5f6c9ec21598be5342111b48fc692e7858f21afc, not stripped

可以看到上面是32位的，而我的系统是64位的

解决办法：重新编译hadoop源码，然后：

mvn package -Pdist,native -DskipTests -Dtar

将/home/hadoop/software/hadoop-2.2.0-src/hadoop-dist/target/hadoop-2.2.0/lib/native文件夹下文件替换服务器上的native下文件

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