1、通過history server

通過history server，直接在web ui上檢視（如果任務異常退出，可能會看不到）

All Applications

application

application log

2、通過yarn命令(使用者要和提交任務的使用者一致）

1）yarn application -list -appStates ALL（這個不顯示時間資訊）

[[email protected] opt]$ yarn application -list -appStates ALL
17/07/26 10:51:33 INFO impl.TimelineClientImpl: Timeline service address: http://node2.hde.h3c.com:8188/ws/v1/timeline/
17/07/26 10:51:33 INFO client.RMProxy: Connecting to ResourceManager at node2.hde.h3c.com/192.38.0.232:8050
Total number of applications (application-types: [] and states: [NEW, NEW_SAVING, SUBMITTED, ACCEPTED, RUNNING, FINISHED, FAILED, KILLED]):2
                Application-Id      Application-Name        Application-Type          User       Queue               State         Final-State         Progress                        Tracking-URL
application_1500702983136_0002            word count               MAPREDUCE     ambari-qa     default            FINISHED           SUCCEEDED             100% http://node2.hde.h3c.com:19888/jobhistory/job/job_1500702983136_0002
application_1500702983136_0001      DistributedShell                    YARN     ambari-qa     default            FINISHED           SUCCEEDED             100%                                 N/A
 

2）yarn logs -applicationId application_1493700892407_0007

[[email protected] opt]$ yarn logs -applicationId application_1500702983136_0002
17/07/26 10:56:23 INFO impl.TimelineClientImpl: Timeline service address: http://node2.hde.h3c.com:8188/ws/v1/timeline/
17/07/26 10:56:23 INFO client.RMProxy: Connecting to ResourceManager at node2.hde.h3c.com/192.38.0.232:8050
17/07/26 10:56:25 INFO zlib.ZlibFactory: Successfully loaded & initialized native-zlib library
17/07/26 10:56:25 INFO compress.CodecPool: Got brand-new decompressor [.deflate]


Container: container_1500702983136_0002_01_000002 on node1.hde.h3c.com_45454
==============================================================================
LogType:stderr
Log Upload Time:Sat Jul 22 01:59:41 -0400 2017
LogLength:0
Log Contents:
End of LogType:stderr

LogType:stdout
Log Upload Time:Sat Jul 22 01:59:41 -0400 2017
LogLength:0
Log Contents:
End of LogType:stdout

LogType:syslog
Log Upload Time:Sat Jul 22 01:59:41 -0400 2017
LogLength:3674
Log Contents:
2017-07-22 01:59:16,446 WARN [main] org.apache.hadoop.metrics2.impl.MetricsConfig: Cannot locate configuration: tried hadoop-metrics2-maptask.properties,hadoop-metrics2.properties
 

3、直接檢視hdfs路徑的log

1）檢視yarn-site.xml，確定log配置目錄

<property>
      <name>yarn.nodemanager.remote-app-log-dir</name>
      <value>/app-logs</value>
</property>
```
2）檢視日誌檔案資訊（注意日期和時間）
[[email protected] root]$ hdfs dfs -ls /app-logs/hdfs/logs
Found 1 items
drwxrwx---   - hdfs hadoop          0 2017-05-02 04:18 /app-logs/hdfs/logs/application_1493700892407_0007

3）檢視日誌詳情（注意檢視節點重啟前的幾個敏感app）
yarn logs -applicationId application_1493700892407_0007（同2）