I try to run pig on mapreduce, but would meet the following error if I didn't start mr history server. But I can run hive on mapreduce without MR historyserver, not sure why pig on mapreduce on MR historyserver. As my understanding historyserver is used for recovery, so it should be OK without historyserver, right ?
2015-01-16 18:38:48,642 [main] INFO org.apache.hadoop.yarn.client.api.impl.TimelineClientImpl - Timeline service address: http://0.0.0.0:8188/ws/v1/timeline/ 2015-01-16 18:38:48,643 [main] INFO org.apache.hadoop.yarn.client.RMProxy - Connecting to ResourceManager at /0.0.0.0:8032 2015-01-16 18:38:48,650 [main] INFO org.apache.hadoop.mapred.ClientServiceDelegate - Application state is completed. FinalApplicationStatus=SUCCEEDED. Redirecting to job history server 2015-01-16 18:38:49,653 [main] INFO org.apache.hadoop.ipc.Client - Retrying connect to server: localhost/0.0.0.0:10020. Already tried 0 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS) 2015-01-16 18:38:50,656 [main] INFO org.apache.hadoop.ipc.Client - Retrying connect to server: localhost/0.0.0.0:10020. Already tried 1 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS) 2015-01-16 18:38:51,658 [main] INFO org.apache.hadoop.ipc.Client - Retrying connect to server: localhost/0.0.0.0:10020. Already tried 2 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS) 2015-01-16 18:38:52,661 [main] INFO org.apache.hadoop.ipc.Client - Retrying connect to server: localhost/0.0.0.0:10020. Already tried 3 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
