Hadoop支持LZO压缩配置

环境准备准备lzo格式压缩文件

#检查是否有lzop命令
[hadoop@Gargantua software]$ which lzop
/bin/lzop
#若没有执行如下安装命令
[root@Gargantua ~]# yum install -y svn ncurses-devel
[root@Gargantua ~]# yum install -y gcc gcc-c++ make cmake
[root@Gargantua ~]# yum install -y openssl openssl-devel svn ncurses-devel zlib-devel libtool
[root@Gargantua ~]# yum install -y lzo lzo-devel lzop autoconf automake cmake

lzo压缩：lzop -v filename
lzo解压：lzop -dv filename

下载、安装并编译LZO

wget http://www.oberhumer.com/opensource/lzo/download/lzo-2.10.tar.gz

tar -zxvf lzo-2.10.tar.gz

cd lzo-2.10

./configure -prefix=/usr/local/hadoop/lzo/

make

make install

编译hadoop-lzo源码

2.1 下载hadoop-lzo的源码，下载地址：https://github.com/twitter/hadoop-lzo/archive/master.zip
2.2 解压之后，修改pom.xml
3.2.2
2.3 声明两个临时环境变量
export C_INCLUDE_PATH=/usr/local/hadoop/lzo/include
export LIBRARY_PATH=/usr/local/hadoop/lzo/lib
2.4 编译
进入hadoop-lzo-master，执行maven编译命令
mvn package -Dmaven.test.skip=true
2.5 进入target，hadoop-lzo-0.4.21-SNAPSHOT.jar 即编译成功的hadoop-lzo组件

配置hadoop关联jar

将编译好后的 hadoop-lzo-0.4.21-SNAPSHOT.jar 放入 $HADOOP_HOME/share/hadoop/common/

core-site.xml增加配置支持LZO压缩

    
        io.compression.codecs
        
            org.apache.hadoop.io.compress.GzipCodec,
            org.apache.hadoop.io.compress.DefaultCodec,
            org.apache.hadoop.io.compress.BZip2Codec,
            org.apache.hadoop.io.compress.SnappyCodec,
            com.hadoop.compression.lzo.LzoCodec,
            com.hadoop.compression.lzo.LzopCodec
        
    

    
        io.compression.codec.lzo.class
        com.hadoop.compression.lzo.LzoCodec

// 将一个大于128M的文件lzo压缩wc.data.lzo，并上传到hdfs

	[liqiang@Gargantua data]$lzop wc.data
	[liqiang@Gargantua data]$ hdfs dfs -put wc.data.lzo /input/wc.data.lzo

执行wc

	hadoop jar $HADOOP_HOME/share/hadoop/mapreduce/hadoop-mapreduce-examples-3.2.2.jar wordcount -Dmapreduce.output.fileoutputformat.compress=true -Dmapreduce.output.fileoutputformat.compress.codec=com.hadoop.compression.lzo.LzopCodec /input/wc.data.lzo /output/wc2

对lzo文件建立索引

hadoop jar $HADOOP_HOME/share/hadoop/common/hadoop-lzo-0.4.21-SNAPSHOT.jar  com.hadoop.compression.lzo.DistributedLzoIndexer /input/wc.data.lzo

hdfs dfs -rm -r /output/wc2
// 再次执行wc

出现 number of splits:2

参考博文：
https://www.cnblogs.com/xuziyu/p/10729992.html
https://blog.csdn.net/zmzdmx/article/details/113655883
https://blog.csdn.net/qq_31405633/article/details/89353295

Hadoop支持LZO压缩配置

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