Hadoop 3.1.1 issue on start HDFS service

Question

I am configuring Hadoop 3.1.1 on mac. However, once I complete all the steps I got the Permission denied on starting namenode, datanode and secondary namenode.

Also,

(unable to load native-hadoop library for your plateform.....using builtin-java classes where applicable)

Answer 1

1. check your hostname of mac, /etc/hosts and hadoop/etc/hadoop/workers
2. you can find problems in hadoop/logs/hadoop~~datanode~~.log