博客

背景：

执行以下两个命令报错：

yarn-session.sh -m yarn-cluster
flink run -m yarn-cluster examples/batch/WordCount.jar

报错信息如下：

Caused by: org.apache.flink.yarn.YarnClusterDescriptor$YarnDeploymentException: The YARN application unexpectedly switched to state FAILED during deployment. 
Diagnostics from YARN: Application application_1679471041834_0001 failed 1 times (global limit =2; local limit is =1) due to AM Container for appattempt_1679471041834_0001_000001 exited with  exitCode: 127
Failing this attempt.Diagnostics: [2023-03-22 15:44:47.568]Exception from container-launch.
Container id: container_1679471041834_0001_01_000001
Exit code: 127
[2023-03-22 15:44:47.597]Container exited with a non-zero exit code 127. Error file: prelaunch.err.
Last 4096 bytes of prelaunch.err :
[2023-03-22 15:44:47.597]Container exited with a non-zero exit code 127. Error file: prelaunch.err.
Last 4096 bytes of prelaunch.err :

排查过程：

检查hadoop是否正常：

hdfs dfsadmin -report 

执行yarn测试程序：

yarn jar ${HADOOP_HOME}/share/hadoop/mapreduce/hadoop-mapreduce-examples-3.2.3.jar pi 1 1

如果以上两个都没有问题，继续进行后续的检查

登录yarn web页面：一般是第一个节点的8088端口

点击FAILED》点击对应的任务ID



然后点击Logs





分别查看Local Logs下面的几个日志文件，一般异常信息都记录在里面

我遇到的问题是我的hadoop-env.sh配置文件中JAVA_HOME配置有问题，导致程序无法运行

正确的配置信息如下：

​


修改hadoop-env.sh配置之后，重启hadoop集群即可

然后继续执行下面的命令应该会正常的

yarn-session.sh -m yarn-cluster
flink run -m yarn-cluster examples/batch/WordCount.jar

本片内容重点是排查问题的过程和思路，希望对于各位同学有帮助

​