查看YARN任务日志的几种方式
点击上方蓝色字体，选择“设为星标”
通过history server
通过history server，直接在web ui上查看（如果任务异常退出，可能会看不到）
通过yarn命令(用户要和提交任务的用户一致）
yarn application -list -appStates ALL（这个不显示时间信息）
[hdfs@node1 opt]$ yarn application -list -appStates ALL17/07/26 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/192.38.0.232:8050Total number of applications (application-types: [] and states: [NEW, NEW_SAVING, SUBMITTED, ACCEPTED, RUNNING, FINISHED, FAILED, KILLED]):2Application-Id Application-Name Application-Type User Queue State Final-State Progress Tracking-URLapplication_1500702983136_0002 word count MAPREDUCE ambari-qa default FINISHED SUCCEEDED 100% http://node2.hde.h3c.com:19888/jobhistory/job/job_1500702983136_0002application_1500702983136_0001 DistributedShell YARN ambari-qa default FINISHED SUCCEEDED 100% N/A
yarn logs -applicationId application_1493700892407_0007
[ambari-qa@node1 opt]$ yarn logs -applicationId application_1500702983136_000217/07/26 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/192.38.0.232:805017/07/26 10:56:25 INFO zlib.ZlibFactory: Successfully loaded & initialized native-zlib library17/07/26 10:56:25 INFO compress.CodecPool: Got brand-new decompressor [.deflate]Container: container_1500702983136_0002_01_000002 on node1.hde.h3c.com_45454==============================================================================LogType:stderrLog Upload Time:Sat Jul 22 01:59:41 -0400 2017LogLength:0Log Contents:End of LogType:stderrLogType:stdoutLog Upload Time:Sat Jul 22 01:59:41 -0400 2017LogLength:0Log Contents:End of LogType:stdoutLogType:syslogLog Upload Time:Sat Jul 22 01:59:41 -0400 2017LogLength:3674Log 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
直接查看hdfs路径的log
查看yarn-site.xml，确定log配置目录
<property><name>yarn.nodemanager.remote-app-log-dir</name><value>/app-logs</value></property>```2）查看日志文件信息（注意日期和时间）[hdfs@node1 root]$ hdfs dfs -ls /app-logs/hdfs/logsFound 1 itemsdrwxrwx--- - hdfs hadoop 0 2017-05-02 04:18 /app-logs/hdfs/logs/application_1493700892407_00073）查看日志详情（注意查看节点重启前的几个敏感app）yarn logs -applicationId application_1493700892407_0007（同2）
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