HDP 2.6.5 Yarn could not start.Error: Could not find or load main class org.apache.hadoop.yarn.server.resourcemanager.ResourceManager

[#1]

1.install ambari 2.6.2.2 with hdp 2.6.5 on centos 7

2.install hdfs yarn components

3.try to start yarn

result:

failed to start yarn with error:

Error: Could not find or load main class org.apache.hadoop.yarn.server.resourcemanager.ResourceManager

Could not find or load main class org.apache.hadoop.yarn.server.applicationhistoryservice.ApplicationHistoryServer

expectation:

1.locate the reason of occuring this error.

2.solve this problem

[#2]

In my case . the file "/etc/profile" has configed a variable "export HADOP_HOME=/opt/hadop" which is conflicted with HDP hadoop home variable

delete /etc/profile HADOP_HOME config will solve this issue