Error in initializing namenode when configuring Hadoop!!!

When formatting namenode in Linux:
exception: when encountering exception during format

Error namenode: failed to start namenode_ When home is not set and could not be found
1. Check the path of hdfs-site.xml file namenode
2. If the user’s permission is not enough, give the Hadoop folder user authorization sudo chown – R Hadoop./Hadoop
3. Configure Java in hadoop-env.sh_ HOME

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