ERROR: Invalid HADOOP_COMMON_HOME

Error when starting Hadoop and yarn
/start yarn. Sh
error: invalid Hadoop_ COMMON_ HOME

Solution:
1. Check Java first_ Is home configured correctly

java
javac

2. Then check whether Hadoop home is configured correctly

hadoop version
Hadoop 3.1.3
Source code repository https://gitbox.apache.org/repos/asf/hadoop.git -r ba631c436b806728f8ec2f54ab1e289526c90579
Compiled by ztang on 2019-09-12T02:47Z
Compiled with protoc 2.5.0
From source with checksum ec785077c385118ac91aadde5ec9799
This command was run using /opt/module/hadoop-3.1.3/share/hadoop/common/hadoop-common-3.1.3.jar


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