Hadoop - Unable to load native-hadoop library for your platform

简介

运行hadoop或者spark（调用hdfs等）时，总出现这样的错误“Unable to load native-hadoop library for your platform”，其实是无法加载本地库

解决办法

1.环境变量是否设好（设好但是还不行尝试第二步）

export HADOOP_COMMON_LIB_NATIVE_DIR=$HADOOP_HOME/lib/native
export HADOOP_OPTS="-Djava.library.path=$HADOOP_HOME/lib/native"

2.默认的libhadoop.so.1.0.0（lib/native）是否是32位，而机器是64位，此时需要编译hadoop，然后替换lib里面的文件

编译安装选项

mvn clean package -Pdist -Dtar -Dmaven.javadoc.skip=true -DskipTests -fail-at-end -Pnative

如果提示需要'libprotoc 2.5.0

 sudo apt-get install -y gcc g++ make maven cmake zlib zlib1g-dev libcurl4-openssl-dev
           curl -# -O https://protobuf.googlecode.com/files/protobuf-2.5.0.tar.gz
           gunzip protobuf-2.5..tar.gz
           tar -xvf protobuf-2.5..tar
           cd protobuf-2.5.
           ./configure --prefix=/usr
           make
           sudo make install
9           sudo ldconfig

如果是在Ubuntu14.04里，提示libtool的错误，那么用/usr/bin/libtool来替换文件中的libtool

编译好的文件

设置HADOOP的日志级别

export HADOOP_ROOT_LOGGER=DEBUG,console

结果

参考：

http://*.com/questions/30702686/building-apache-hadoop-2-6-0-throwing-maven-error

http://*.com/questions/19943766/hadoop-unable-to-load-native-hadoop-library-for-your-platform-warning

http://*.com/questions/19556253/trunk-doesnt-compile-because-libprotoc-is-old-when-working-with-hadoop-under-ec