YARN加载本地库抛出Unable to load native-hadoop library解决办法

用官方的Hadoop 2.1.0-beta安装后，每次hadoop命令进去都会抛出这样一个Warning

WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable

设置logger级别，看下具体原因

export HADOOP_ROOT_LOGGER=DEBUG,console

...

DEPRECATED: Use of this script to execute hdfs command is deprecated.
Instead use the hdfs command for it.

14/08/23 10:04:21 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
report: Failed on local exception: java.io.IOException: Connection reset by peer; Host Details : local host is: "VM_160_34_centos/127.0.0.1"; destination host is: "Master":9000;

wrong ELFCLASS32，难道是加载的so文件系统版本不对

执行命令

file libhadoop.so.1.0.0

hadoop@VM_160_34_centos:/usr/local/hadoop-2.4.0/lib/native> 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

果然是80386，是32位的系统版本，而我的hadoop环境是64位OS

　　原来直接从apache镜像中下载的编译好的Hadoop版本native library都是32版本的，如果要支持64位版本，必须自己重新编译，这就有点坑爹了，要知道几乎所有的生产环境都是64位的OS

YARN官方对于native library的一段话验证了这一点

“The pre-built 32-bit i386-Linux native hadoop library is available as part of the hadoop distribution and is located in the lib/native directory”

解决方法：重新编译hadoop

解决方法，就是重新编译hadoop软件：

安装开发环境

1.必要的包

yum install svn

yum install autoconfautomake libtool cmake

yum install ncurses-devel

yum install openssl-devel

yum install gcc*

2.安装maven

下载，并解压

wget  -c http://mirrors.hust.edu.cn/apache/maven/maven-3/3.2.3/binaries/apache-maven-3.2.3-bin.tar.gz
tar -zxvf apache-maven-3.2.3-bin.tar.gz  -C /usr/local/

将/usr/local/apache-maven-3.2.3/bin加到环境变量中

root@VM_160_34_centos:~/tools> vi /etc/profile.d/maven-development.sh 
export M2_HOME=/usr/local/apache-maven-3.2.3
export PATH=$PATH:$M2_HOME/bin
root@VM_160_34_centos:~/tools> source /etc/profile

测试 maven

root@VM_160_34_centos:/usr/local/apache-maven-3.2.3> mvn -version
Apache Maven 3.2.3 (33f8c3e1027c3ddde99d3cdebad2656a31e8fdf4; 2014-08-12T04:58:10+08:00)
Maven home: /usr/local/apache-maven-3.2.3
Java version: 1.7.0_55, vendor: Oracle Corporation
Java home: /usr/local/java/jdk1.7.0_55/jre
Default locale: en_US, platform encoding: ANSI_X3.4-1968
OS name: "linux", version: "2.6.32-220.el6.x86_64", arch: "amd64", family: "unix"

3.安装protobuf

没装 protobuf,后面编译做不完，结果如下：

[INFO] —hadoop-maven-plugins:2.4.0:protoc (compile-protoc) @ hadoop-common —

[WARNING] [protoc, --version] failed:java.io.IOException: Cannot run program “protoc”: error=2, No suchfile or directory

[ERROR] stdout: []

……………………

[INFO] Apache Hadoop Main………………………….. SUCCESS [5.672s]

[INFO] Apache Hadoop Project POM……………………. SUCCESS [3.682s]

[INFO] Apache Hadoop Annotations……………………. SUCCESS [8.921s]

[INFO] Apache Hadoop Assemblies…………………….. SUCCESS [0.676s]

[INFO] Apache Hadoop Project Dist POM……………….. SUCCESS [4.590s]

[INFO] Apache Hadoop Maven Plugins………………….. SUCCESS [9.172s]

[INFO] Apache Hadoop Auth………………………….. SUCCESS [10.123s]

[INFO] Apache Hadoop Auth Examples………………….. SUCCESS [5.170s]

[INFO] Apache HadoopCommon ………………………… FAILURE [1.224s]

[INFO] Apache Hadoop NFS…………………………… SKIPPED

[INFO] Apache Hadoop Common Project…………………. SKIPPED

[INFO] Apache Hadoop HDFS………………………….. SKIPPED

[INFO] Apache Hadoop HttpFS………………………… SKIPPED

[INFO] Apache Hadoop HDFS BookKeeperJournal …………. SKIPPED

[INFO] Apache Hadoop HDFS-NFS………………………. SKIPPED

[INFO] Apache Hadoop HDFS Project…………………… SKIPPED

安装protobuf过程

下载：

root@VM_160_34_centos:~/tools> wget -c https://protobuf.googlecode.com/files/protobuf-2.5.0.tar.gz

解压

root@VM_160_34_centos:~/tools> tar -xvzf protobuf-2.5.0.tar.gz

root@VM_160_34_centos:~/tools/protobuf-2.5.0> cd protobuf-2.5.0

依次执行下面的命令即可

./configure

make

make check

make install

测试安装:

root@VM_160_34_centos:~/tools/releaseprotoc -version
protoc: error while loading shared libraries: libprotobuf.so.8: cannot open shared object file: No such file or directory

这里报错解决办法

root@VM_160_34_centos:~/tools/release-2.4.0> cat >> /etc/profile.d/protoc-development.sh << end
> export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib
> end
root@VM_160_34_centos:~/tools/release-2.4.0> source /etc/profile

测试结果

root@VM_160_34_centos:~/tools/release-2.4.0> protoc --version
libprotoc 2.5.0

libprotoc 2.5.0

重新checkout source code

svn checkout http://svn.apache.org/repos/asf/hadoop/common/tags/release-2.4.0/

加上编译native的选项，编译时会根据当前的操作系统架构来生产相应的native库

mvn package -Pdist,native -DskipTests -Dtar

验证一下：

root@VM_160_34_centos:~/tools/release-2.4.0>cd hadoop-dist/target/hadoop-2.4.0/lib/native
root@VM_160_34_centos:~/tools/release-2.4.0/hadoop-dist/target/hadoop-2.4.0/lib/native> file libhadoop.so.1.0.0 
libhadoop.so.1.0.0: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, not stripped

目录下hadoop-2.4.0.tar.gz也有了，以后应该就可以直接用了。

感谢 : http://www.kankanews.com/ICkengine/archives/81648.shtml