Aggregation is not enabled. Try the nodemanager at IP:HOST

Question:
Aggregation service start
hadoop 2.2.0, I want to view Tracking UI,so I visit http://172.11.12.6:8088/cluster,then I click History of Completed Job,such as follows:

MapReduce Job job_1392601388579_0001
Attempt Number Start Time Node Logs
1 Sun Feb 16 17:44:57 PST 2014 master:8042 logs

Then I click logs,but it failed.
Aggregation is not enabled. Try the nodemanager at master:8994

I guess it must a service don’t start, which command I need to execute under
home/software/hadoop-2.2.0/sbin ? Thanks.

[hadoop  node1 sbin]$ ls  
distribute-exclude.sh    start-all.cmd        stop-all.sh  
hadoop-daemon.sh         start-all.sh         stop-balancer.sh  
hadoop-daemons.sh        start-balancer.sh    stop-dfs.cmd  
hdfs-config.cmd          start-dfs.cmd        stop-dfs.sh  
hdfs-config.sh           start-dfs.sh         stop-secure-dns.sh  
httpfs.sh                start-secure-dns.sh  stop-yarn.cmd  
mr-jobhistory-daemon.sh  start-yarn.cmd       stop-yarn.sh  
refresh-namenodes.sh     start-yarn.sh        yarn-daemon.sh  
slaves.sh                stop-all.cmd         yarn-daemons.sh  

Answer:
Please set /opt/mapr/hadoop/hadoop-[VERSION]/etc/hadoop/yarn-site.xml:

<property>
  <name>yarn.log-aggregation-enable</name>
  <value>true</value>
</property>

in yarn-site.xml to enable log aggregation.

restart NodeManager & JobHistoryServer

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