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javax.servlet.ServletException: javax.security.auth.login.LoginException: Unable to obtain password from user	at org.apache.hadoop.security.authentication.server.KerberosAuthenticationHandler.init(KerberosAuthenticationHandler.java:178)	at org.apache.hadoop.security.authentication.server.AuthenticationFilter.init(AuthenticationFilter.java:146)	at org.mortbay.jetty.servlet.FilterHolder.doStart(FilterHolder.java:97)	at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)	at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:713)	at org.mortbay.jetty.servlet.Context.startContext(Context.java:140)	at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1282)	at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:518)	at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:499)	at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)	at org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:152)	at org.mortbay.jetty.handler.ContextHandlerCollection.doStart(ContextHandlerCollection.java:156)	at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)	at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)	at org.mortbay.jetty.Server.doStart(Server.java:224)	at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)	at org.apache.hadoop.http.HttpServer.start(HttpServer.java:631)	at org.apache.hadoop.hdfs.server.namenode.NameNode$1.run(NameNode.java:484)	at org.apache.hadoop.hdfs.server.namenode.NameNode$1.run(NameNode.java:362)	at java.security.AccessController.doPrivileged(Native Method)	at javax.security.auth.Subject.doAs(Subject.java:396)	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1149)	at org.apache.hadoop.hdfs.server.namenode.NameNode.startHttpServer(NameNode.java:362)	at org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:313)	at org.apache.hadoop.hdfs.server.namenode.NameNode.(NameNode.java:536)	at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1410)	at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1419)