Hadoop Could not load native gpl library异常解决

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   完整异常:

11/11/07 10:15:02 ERROR lzo.GPLNativeCodeLoader: Could not load native gpl library
java.lang.UnsatisfiedLinkError: no gplcompression in java.library.path
	at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1738)
	at java.lang.Runtime.loadLibrary0(Runtime.java:823)
	at java.lang.System.loadLibrary(System.java:1028)
	at com.hadoop.compression.lzo.GPLNativeCodeLoader.<clinit>(GPLNativeCodeLoader.java:32)
	at com.hadoop.compression.lzo.LzoCodec.<clinit>(LzoCodec.java:71)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:247)
	at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:943)
	at org.apache.hadoop.io.compress.CompressionCodecFactory.getCodecClasses(CompressionCodecFactory.java:89)
	at org.apache.hadoop.io.compress.CompressionCodecFactory.<init>(CompressionCodecFactory.java:134)
	at com.twitter.elephantbird.mapreduce.input.LzoRecordReader.initialize(LzoRecordReader.java:61)
	at com.twitter.elephantbird.mapreduce.input.LzoBinaryB64LineRecordReader.initialize(LzoBinaryB64LineRecordReader.java:79)
	at org.apache.hadoop.mapreduce.lib.input.DelegatingRecordReader.initialize(DelegatingRecordReader.java:80)
	at org.apache.hadoop.mapred.MapTask$NewTrackingRecordReader.initialize(MapTask.java:450)
	at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:645)
	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:322)
	at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:210)
11/11/07 10:15:02 ERROR lzo.LzoCodec: Cannot load native-lzo without native-hadoop
11/11/07 10:15:02 WARN mapred.LocalJobRunner: job_local_0001
java.lang.RuntimeException: native-lzo library not available
	at com.hadoop.compression.lzo.LzopCodec.createDecompressor(LzopCodec.java:91)
	at com.hadoop.compression.lzo.LzopCodec.createInputStream(LzopCodec.java:76)
	at com.twitter.elephantbird.mapreduce.input.LzoRecordReader.initialize(LzoRecordReader.java:71)
	at com.twitter.elephantbird.mapreduce.input.LzoBinaryB64LineRecordReader.initialize(LzoBinaryB64LineRecordReader.java:79)
	at org.apache.hadoop.mapreduce.lib.input.DelegatingRecordReader.initialize(DelegatingRecordReader.java:80)
	at org.apache.hadoop.mapred.MapTask$NewTrackingRecordReader.initialize(MapTask.java:450)
	at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:645)
	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:322)
	at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:210)

 

  这里要感谢google,但搜索不是那么容易.网上一些解决方法并不全面.我这里整理下.

  首先搜到的是http://p-x1984.iteye.com/blog/1157145,里面说是JDK版本原因,要将32位的JDK改成64位. 于是我输入命令查看下JDK版本:java -version.(你可以先通过uname -a查看你的操作系统位数)

    得到的结果发现已经是64位,结果如下:

    java version "1.6.0_26"

Java(TM) SE Runtime Environment (build 1.6.0_26-b03)
Java HotSpot(TM) 64-Bit Server VM (build 20.1-b02, mixed mode)

 

   后来想下自己压根就没有装什么lzo,同时找到了这篇:http://comments.gmane.org/gmane.comp.java.hadoop.hbase.user/15776.验证了我的想法,根据里面的提示http://code.google.com/a/apache-extras.org/p/hadoop-gpl-compression/wiki/FAQ?redir=1一步步安装.命令如下:

    1.先安装hadoop-gpl-compression

     1)下载(我一般都会进入自己的下载目录,命令:cd $HOME/Downloads,由你自己决定):

         wget http://hadoop-gpl-compression.googlecode.com/files/hadoop-gpl-compression-0.1.0-rc0.tar.gz

      2)解压

         tar -xvf hadoop-gpl-compression-0.1.0-rc0.tar.gz

      3)将解压好的hadoop-gpl-compression-0.1.0.jar移到你的hadoop/lib目录(我这里是$HADOOP_HOME/lib

,如果没有请设置$HADOOP_HOME,或者替换成你的hadoop目录)下:

        mv hadoop-gpl-compression-0.1.0/hadoop-gpl-compression-0.1.0.jar $HADOOP_HOME/lib/

    4)把库文件拷贝到hadoop的本地库目录中

      mv hadoop-gpl-compression-0.1.0/lib/native/Linux-i386-32/* $HADOOP_HOME/lib/native/Linux-i386-32/  

      mv hadoop-gpl-compression-0.1.0/lib/native/Linux-amd64-64/* $HADOOP_HOME/lib/native/Linux-amd64-64/ 

 

  2.安装lzo类库

      1)安装g++和gcc

          sudo apt-get install g++

          sudo apt-get install gcc

      2)下载lzo

          wget http://www.oberhumer.com/opensource/lzo/download/lzo-2.03.tar.gz

      3)解压

          tar -xvf lzo-2.03.tar.gz 

      4)编译安装

          cd lzo-2.03

          sudo ./configure  

          sudo make  

          sudo make install 

 

     Eclipse调试相关源码时,如果还报以上错误,那有可能是Eclipse获取不到/usr/local/lib.有两种解决方法:

     一种是将/usr/local/lib放入你的环境变量.如: vi ~./bashrc,加入以下行:

     export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib

    然后通过命令启动Eclipse,也就是输入eclipse,当然前提是要你设置了Path.或者重启系统;

    还有一种是将Native Library Location设置进你的工程,具体做法是.

    右击你的工程->选择Properties->选择左边的Java Build Path->然后在右边的Libraries下找到hadoop-lzo-xxx.jar.

    点击该jar,双击该jar下的Native Library Location,设置为/usr/local/lib即可.如此就无需重启系统之类的.但长期来看还是建议第一种方法,设置环境变量,省得每次都需要设置

 

  

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