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