Java Hadoop：无法为您的平台加载本机 Hadoop 库
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Hadoop: Unable to load native-hadoop library for your platform
提问by El Mehdi Belgasmi
I've installed Hadoop 2.7.2 single node on Ubuntu and I want to run the java wordcount program. The compilation and the creation of the jar file are done succesfully, but when I run the jar file on Hadoop I receive this message:
我已经在 Ubuntu 上安装了 Hadoop 2.7.2 单节点，我想运行 java wordcount 程序。jar 文件的编译和创建已成功完成，但是当我在 Hadoop 上运行 jar 文件时，我收到以下消息：
WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
I set environment variables by editing .bashrc file:
我通过编辑 .bashrc 文件来设置环境变量：
export HADOOP_COMMON_LIB_NATIVE_DIR=$HADOOP_HOME/lib
When I type hadoop checknative -a I get this:
当我输入 hadoop checknative -a 我得到这个：
hadoop: true /usr/local/hadoop/lib/native/libhadoop.so.1.0.0
zlib: true /lib/x86_64-linux-gnu/libz.so.1
snappy: false
lz4: true revision:99
bzip2: false
openssl: true /usr/lib/x86_64-linux-gnu/libcrypto.so
16/05/09 00:48:53 INFO util.ExitUtil: Exiting with status 1
Hadoop version: 2.7.2
Hadoop 版本：2.7.2
Ubuntu version: 14.04
Ubuntu 版本：14.04
Could anyone give some clues about the issue?
任何人都可以提供有关该问题的一些线索吗？
回答by Nishu Tayal
Move your compiled native library files to $HADOOP_HOME/lib folder.
将编译的本机库文件移动到 $HADOOP_HOME/lib 文件夹。
Then set your environment variables by editing .bashrc file
然后通过编辑 .bashrc 文件设置环境变量
export HADOOP_COMMON_LIB_NATIVE_DIR=$HADOOP_HOME/lib
export HADOOP_OPTS="$HADOOP_OPTS -Djava.library.path=$HADOOP_HOME/lib"
Make sure your compiled native library files are in $HADOOP_HOME/lib folder.
确保您编译的本机库文件位于 $HADOOP_HOME/lib 文件夹中。
It should fix the issue.
它应该解决这个问题。
回答by Ishan Kumar
Try to load the hadoop jars-"hadoop-common.jar and hadoop-core.jar" to your class path. You can simply do it in eclipse ans while creating a jar file those jars will be referenced automatically.
尝试将 hadoop jars-“hadoop-common.jar 和 hadoop-core.jar”加载到您的类路径。您可以在创建 jar 文件时在 eclipse ans 中简单地执行此操作，这些 jar 将被自动引用。
回答by strom
edit the file hadoop-env.shin /usr/local/etc/hadoop
编辑文件hadoop-env.sh中/usr/local/etc/hadoop
Adding Hadoop library into LD_LIBRARY_PATH:
将 Hadoop 库添加到LD_LIBRARY_PATH：
export LD_LIBRARY_PATH=/usr/local/hadoop/lib/native/:$LD_LIBRARY_PATH
try it, works for me
试试看，对我有用
回答by Mike Onuorah
Add the commands lines below to hadoop-env.sh, it should suppress the errors encountered
将下面的命令行添加到hadoop-env.sh，它应该抑制遇到的错误
export HADOOP_HOME_WARN_SUPPRESS=1
export HADOOP_ROOT_LOGGER="WARN,DRFA"
