Hadoop2.2如何集成Apache Pig0.12.1？

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散仙假设你的Hadoop环境已经安装完毕


（1）到[url]https://archive.apache.org/dist/pig/[/url]下载对应的tar包，如果是hadoop0.20.x之前的版本，则直接可以用，如果Hadoop2.x之后的，则需要重新编译，在pig的根目录下执行如下命令：

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ant clean jar-withouthadoop -Dhadoopversion=23

否则执行MapReduce时，会报如下的异常

2013-10-24 09:35:19,300 [main] WARN 
org.apache.pig.backend.hadoop20.PigJobControl - falling back to default 
JobControl (not using hadoop 0.20 ?)
java.lang.NoSuchFieldException: runnerState
     at java.lang.Class.getDeclaredField(Class.java:1938)
     at 
org.apache.pig.backend.hadoop20.PigJobControl.<clinit>(PigJobControl.java:51)
     at 
org.apache.p

（2）配置Pig的环境变量：

export PIG_CLASSPATH=$HADOOP_HOME/etc/hadoop
export PATH=/home/search/pig-0.12.1/bin:$PATH

（3）直接在linux终端执行pig命令，即可进入grunt界面：

2015-05-01 12:44:58,573 [main] INFO  org.apache.pig.Main - Apache Pig version 0.12.2-SNAPSHOT (r: unknown) compiled May 01 2015, 12:28:37
2015-05-01 12:44:58,574 [main] INFO  org.apache.pig.Main - Logging error messages to: /home/search/pig-0.12.1/build/pig_1430498698551.log
2015-05-01 12:44:58,602 [main] INFO  org.apache.pig.impl.util.Utils - Default bootup file /home/search/.pigbootup not found
2015-05-01 12:44:59,244 [main] INFO  org.apache.hadoop.conf.Configuration.deprecation - mapred.job.tracker is deprecated. Instead, use mapreduce.jobtracker.address
2015-05-01 12:44:59,244 [main] INFO  org.apache.hadoop.conf.Configuration.deprecation - fs.default.name is deprecated. Instead, use fs.defaultFS
2015-05-01 12:44:59,244 [main] INFO  org.apache.pig.backend.hadoop.executionengine.HExecutionEngine - Connecting to hadoop file system at: hdfs://h1:8020
2015-05-01 12:44:59,247 [main] INFO  org.apache.hadoop.conf.Configuration.deprecation - mapred.used.genericoptionsparser is deprecated. Instead, use mapreduce.client.genericoptionsparser.used
2015-05-01 12:45:00,465 [main] INFO  org.apache.pig.backend.hadoop.executionengine.HExecutionEngine - Connecting to map-reduce job tracker at: h1:8021
2015-05-01 12:45:00,469 [main] INFO  org.apache.hadoop.conf.Configuration.deprecation - fs.default.name is deprecated. Instead, use fs.defaultFS
grunt> 

（4）pig -i查看pig的版本，
pig --help 查看pig的一些帮助命令
pig -x local 执行local模式
pig -x mapreduce 执行MapReduce模式

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