Failed to connect to ResourceManager

The phenomenon

spark-submit on yarn There is an exception in the report .

22/07/20 15:59:52 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
22/07/20 15:59:53 INFO client.RMProxy: Connecting to ResourceManager at sh01/172.16.99.215:8010
22/07/20 15:59:54 INFO ipc.Client: Retrying connect to server: sh01/172.17.99.215:8010. Already tried 0 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
22/07/20 15:59:55 INFO ipc.Client: Retrying connect to server: sh01/172.17.99.215:8010. Already tried 1 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
22/07/20 15:59:56 INFO ipc.Client: Retrying connect to server: sh01/172.17.99.215:8010. Already tried 2 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)

According to the log is a link ResourceManager I have been trying … That is to say, the client cannot be connected yarn.

---

Problem finding

1. Confirm on the platform yarn Has it started ,（ What I met was yarn Has not started ）

   jps
   
   8144 SecondaryNameNode
   9251 Master
   7732 NameNode
   3215205 Jps
   3214887 ResourceManager #（ You can see this expression  yarn  Launched the ）
   2748510 Master
   

2. look down yarn-site.xml Is the configuration correct .

    <property>
      <name>yarn.resourcemanager.address</name>
      <value>sh01:8010</value>
    </property>
   

3. It may not be able to resolve the custom and domain name , stay /etc/hosts To configure domain name mapping .

   127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
   ::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
   172.17.99.215 sh01
   

4. confirm hadoop Whether the environment variables are configured correctly .

   echo ${HADOOP_HOME}
   /usr/local/hadoop