Connection Error in Apache Pig

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错误如下:

2013-07-29 13:24:08,591 [main] INFO  org.apache.hadoop.mapred.ClientServiceDelegate - Application state is completed. FinalApplicationStatus=SUCCEEDED. Redirecting to job history server 013-07-29 11:57:29,421 [main] INFO  org.apache.hadoop.ipc.Client - Retrying connect to server: 0.0.0.0/0.0.0.0:10020. Already tried 0 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)2013-07-29 11:57:30,421 [main] INFO  org.apache.hadoop.ipc.Client - Retrying connect to server: 0.0.0.0/0.0.0.0:10020. Already tried 1 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)2013-07-29 11:57:31,422 [main] INFO  org.apache.hadoop.ipc.Client - Retrying connect to server: 0.0.0.0/0.0.0.0:10020. Already tried 2 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)...2013-07-29 13:24:18,597 [main] INFO  org.apache.hadoop.ipc.Client - Retrying connect to server: 0.0.0.0/0.0.0.0:10020. Already tried 9 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)2013-07-29 13:24:18,598 [main] ERROR org.apache.hadoop.security.UserGroupInformation - PriviledgedActionException as:gpadmin (auth:SIMPLE) cause:java.io.IOException

解决方法很简单，只需要一条命令即可:

mr-jobhistory-daemon.sh start historyserver

mr-hobhistory-daemon.sh在hadoop安装目录下的sbin目录中

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