WARN util.NativeCodeLoader

1、错误描述

当在Hadoop sbin目录下执行start-dfs.sh脚本的时候，出现报错17:52:29 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable Starting namenodes on [wh301]

$ ./start-dfs.sh

17/03/15 17:52:29 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable

Starting namenodes on [wh301]

wh301: starting namenode, logging to /usr/local/hadoop/logs/hadoop-hadoop-namenode-wh301.out

localhost: starting datanode, logging to /usr/local/hadoop/logs/hadoop-hadoop-datanode-wh301.out

Starting secondary namenodes [0.0.0.0]

0.0.0.0: starting secondarynamenode, logging to /usr/local/hadoop/logs/hadoop-hadoop-secondarynamenode-wh301.out

17/03/15 17:52:47 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable

2、分析

这是由于hadoop-2.6.0.tar.gz安装包是在32位机器上编译的，在64位的机器安装此包后，当加载本地库.so文件时就会出现版本不一致的情况。

3、解决

我的建议是下载相关的64位lib库进行替换lib目录下的原native目录，位置是/usr/local/hadoop/lib/native。（如果你的安装目录和我的一致的话）

tar -x hadoop-native-64-2.6.0.tar -C  /usr/local/hadoop/lib/native/

[hadoop@wh301 native]$ ls -ltr

total 4356

-rwxr-xr-x. 1 hadoop hadoop  228435 Dec  2  2014 libhdfs.so.0.0.0

-rw-r--r--. 1 hadoop hadoop  359458 Dec  2  2014 libhdfs.a

-rwxr-xr-x. 1 hadoop hadoop  671189 Dec  2  2014 libhadoop.so.1.0.0

-rw-r--r--. 1 hadoop hadoop 1119486 Dec  2  2014 libhadoop.a

-rw-r--r--. 1 hadoop hadoop  581944 Dec  2  2014 libhadooputils.a

-rw-r--r--. 1 hadoop hadoop 1486964 Dec  2  2014 libhadooppipes.a

lrwxrwxrwx. 1 hadoop hadoop      18 Mar 15 17:55 libhadoop.so -> libhadoop.so.1.0.0

lrwxrwxrwx. 1 hadoop hadoop      16 Mar 15 17:55 libhdfs.so -> libhdfs.so.0.0.0

[hadoop@wh301 native]$ pwd

/usr/local/hadoop/lib/native

[hadoop@wh301 sbin]$ ./start-dfs.sh

Starting namenodes on [wh301]

wh301: starting namenode, logging to /usr/local/hadoop/logs/hadoop-hadoop-namenode-wh301.out

localhost: starting datanode, logging to /usr/local/hadoop/logs/hadoop-hadoop-datanode-wh301.out

Starting secondary namenodes [0.0.0.0]

0.0.0.0: starting secondarynamenode, logging to /usr/local/hadoop/logs/hadoop-hadoop-secondarynamenode-wh301.out

可以看到，错误解决了。

如果你是hadoop2.6版本就可以右键下载：

nativelib_64bit_Hadoop2.6