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Re: Error in namenode log file
Thanks for the info Alex

Regards,
    Mohammad Tariq

On Tue, Nov 29, 2011 at 1:09 PM, Alexander C.H. Lorenz
<[EMAIL PROTECTED]> wrote:
> 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 <[EMAIL PROTECTED]> 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.
>
>