报错

Exception in thread "main" org.apache.hadoop.security.KerberosAuthException: failure to login: for principal: xx@HADOOP.COM from keytab xx.keytab javax.security.auth.login.LoginException: Unable to obtain password from user

        at org.apache.hadoop.security.UserGroupInformation.doSubjectLogin(UserGroupInformation.java:1880)
        at org.apache.hadoop.security.UserGroupInformation.loginUserFromKeytabAndReturnUGI(UserGroupInformation.java:1247)
        at org.apache.hadoop.security.UserGroupInformation.loginUserFromKeytab(UserGroupInformation.java:1016)
        at ...
Caused by: javax.security.auth.login.LoginException: Unable to obtain password from user
        at com.sun.security.auth.module.Krb5LoginModule.promptForPass(Krb5LoginModule.java:897)
        at com.sun.security.auth.module.Krb5LoginModule.attemptAuthentication(Krb5LoginModule.java:760)
        at com.sun.security.auth.module.Krb5LoginModule.login(Krb5LoginModule.java:617)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at javax.security.auth.login.LoginContext.invoke(LoginContext.java:755)
        at javax.security.auth.login.LoginContext.access$000(LoginContext.java:195)
        at javax.security.auth.login.LoginContext$4.run(LoginContext.java:682)
        at javax.security.auth.login.LoginContext$4.run(LoginContext.java:680)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.login.LoginContext.invokePriv(LoginContext.java:680)
        at javax.security.auth.login.LoginContext.login(LoginContext.java:587)
        at org.apache.hadoop.security.UserGroupInformation$HadoopLoginContext.login(UserGroupInformation.java:1959)
        at org.apache.hadoop.security.UserGroupInformation.doSubjectLogin(UserGroupInformation.java:1869)
        ... 4 more

解决

1. 启动进程的用户对于xx.keytab文件的权限应为600 。 （这个确定）
2. 该用户还应该有xx.keytab文件所在目录的访问权限。（个人经验）