Pig安装

环境：

hadoop-2.4.1、jdk1.6.0_45、pig-0.12.1

 

1、下载pig并解压

tar -xzvf pig-0.12.1.tar.gz

　　 

2、设置环境变量

export PIG_HOME=~/pig-0.12.1
export PATH=$PATH:$PIG_HOME/bin

　　 

3、测试

pig -help

　　 

4、说明

1）同一个pig支持多个hadoop版本

2）pig默认通过HADOOP_HOME确定hadoop的版本及安装位置，如果没有HADOOP_HOME环境变量，则pig使用其内置的hadoop版本

3）/bin/pig，可以在这里配置环境变量，比如覆盖全局的HADOOP_HOME

The Pig command script
#
# Environment Variables
#
#     JAVA_HOME                The java implementation to use.    Overrides JAVA_HOME.
#
#     PIG_CLASSPATH Extra Java CLASSPATH entries.
#
#     PIG_USER_CLASSPATH_FIRST If set, add user provided classpath entries to
#                              the top of classpath instead of appending them.
#                              Default is unset, i.e. the classpath entries are
#                              placed normally at the end of a pre-defined classpath.
#
#     HADOOP_HOME/HADOOP_PREFIX     Environment HADOOP_HOME/HADOOP_PREFIX(0.20.205)
#
#     HADOOP_CONF_DIR     Hadoop conf dir
#
#     PIG_HEAPSIZE    The maximum amount of heap to use, in MB. 
#                                        Default is 1000.
#
#     PIG_OPTS            Extra Java runtime options.
#
#     PIG_CONF_DIR    Alternate conf dir. Default is ${PIG_HOME}/conf.
#
#     HBASE_HOME       Optionally, the HBase installation directory.
#                      Defaults to ${PIG_HOME}/share/hbase
#
#     HBASE_CONF_DIR - Optionally, the HBase configuration to run against
#                      when using HBaseStorage. Defaults to ${HBASE_HOME}/conf

4）/conf/pig.properties

这里存放一些属性值，在执行pig脚本的时候默认加载。

 

注意：如果执行pig客户端的用户跟hadoop集群的用户不是一个用户，需要将hdfs上的/tmp目录设置成777权限 

hdfs dfs -chmod -R 777 /tmp