Hi, the user "webuser" is a internal user (dfs.web.ugi = webuser, webgroup) and can be configured. This is the superuser, can read all content and is usually used by the webinterfaces. You can add a system user (adduser webuser -g webgroup).
- Alex On Mon, Nov 28, 2011 at 9:21 PM, Mohammad Tariq <donta...@gmail.com> wrote: > Hello, > > Although the namenode is running properly I can see the below shown > warning in the log file.Could anyone tell me its meaning???? > > 2011-11-29 01:42:30,582 WARN > org.apache.hadoop.security.ShellBasedUnixGroupsMapping: got exception > trying to get groups for user webuser > org.apache.hadoop.util.Shell$ExitCodeException: id: webuser: No such user > > at org.apache.hadoop.util.Shell.runCommand(Shell.java:255) > at org.apache.hadoop.util.Shell.run(Shell.java:182) > at > org.apache.hadoop.util.Shell$ShellCommandExecutor.execute(Shell.java:375) > at org.apache.hadoop.util.Shell.execCommand(Shell.java:461) > at org.apache.hadoop.util.Shell.execCommand(Shell.java:444) > at > org.apache.hadoop.security.ShellBasedUnixGroupsMapping.getUnixGroups(ShellBasedUnixGroupsMapping.java:68) > at > org.apache.hadoop.security.ShellBasedUnixGroupsMapping.getGroups(ShellBasedUnixGroupsMapping.java:45) > at org.apache.hadoop.security.Groups.getGroups(Groups.java:79) > at > org.apache.hadoop.security.UserGroupInformation.getGroupNames(UserGroupInformation.java:966) > at > org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.<init>(FSPermissionChecker.java:50) > at > org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkPermission(FSNamesystem.java:5160) > at > org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkTraverse(FSNamesystem.java:5143) > at > org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getFileInfo(FSNamesystem.java:1992) > at > org.apache.hadoop.hdfs.server.namenode.NameNode.getFileInfo(NameNode.java:837) > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) > at > sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) > at > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) > at java.lang.reflect.Method.invoke(Method.java:597) > at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:563) > at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1388) > at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1384) > at java.security.AccessController.doPrivileged(Native Method) > at javax.security.auth.Subject.doAs(Subject.java:396) > at > org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1059) > at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1382) > 2011-11-29 01:44:59,571 INFO > org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Roll Edit Log > from 127.0.0.1 > 2011-11-29 01:44:59,572 INFO > org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Number of > transactions: 0 Total time for transactions(ms): 0Number of > transactions batched in Syncs: 0 Number of syncs: 0 SyncTimes(ms): 0 > 2011-11-29 01:45:02,416 INFO > org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Roll FSImage from > 127.0.0.1 > 2011-11-29 01:45:02,416 INFO > org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Number of > transactions: 0 Total time for transactions(ms): 0Number of > transactions batched in Syncs: 0 Number of syncs: 1 SyncTimes(ms): 109 > > Regards, > Mohammad Tariq > -- Alexander Lorenz http://mapredit.blogspot.com *P **Think of the environment: please don't print this email unless you really need to.*
