@Ben Liu If the cluster you are trying to connect is secure (means Kerberos Enabled) then you can refer to the following article to know about how to connect to it : https://community.hortonworks.com/articles/56702/a-secure-hdfs-client-example.html . If the cluster that you are trying to connect to , is not secure then you might be using incorrect (core-site.xml / hdfs-site.xml) or incorrect property like "hadoop.security.authentication" which might be creating confusion here. Please check the classpath resources/configs. ... View more