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MapReduce >> mail # user >> Re: Permissions


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Amal G Jose 2013-05-10, 19:32
The user through which you are trying to run the task should jave
permission on hdfs. just verify that

*Thanks & Regards    *


Shashwat Shriparv

On Sat, May 11, 2013 at 1:02 AM, Amal G Jose <[EMAIL PROTECTED]> wrote:

> After starting the hdfs, ie NN, SN and DN, create an hdfs directory
> structure in the form /<hadoop.tmp.dir>/mapred/staging.
> Then give 777 permission to staging. After that change the ownership of
> mapred directory to mapred user.
> After doing this start jobtracker, it will start. Otherwise, it will not
> start.
> The reason for not showing any datanodes may be due to firewall. Check
> whether the necessary ports are open.
>
>
>
> On Tue, Apr 30, 2013 at 2:28 AM, <[EMAIL PROTECTED]> wrote:
>
>> I look in the name node log and I get the following errors:
>>
>> 2013-04-29 15:25:11,646 ERROR
>> org.apache.hadoop.security.UserGroupInformation: PriviledgedActionException
>> as:mapred (auth:SIMPLE)
>> cause:org.apache.hadoop.security.AccessControlException: Permission denied:
>> *user=mapred*, access=WRITE, inode="/":hdfs:supergroup:drwxr-xr-x
>>
>> 2013-04-29 15:25:11,646 INFO org.apache.hadoop.ipc.Server: IPC Server
>> handler 6 on 9000, call
>> org.apache.hadoop.hdfs.protocol.ClientProtocol.mkdirs from
>> 172.16.26.68:45044: error:
>> org.apache.hadoop.security.AccessControlException: Permission denied: *
>> user=mapred*, access=WRITE, inode="/":hdfs:supergroup:drwxr-xr-x
>> org.apache.hadoop.security.AccessControlException: Permission denied: *
>> user=mapred,* access=WRITE, inode="/":hdfs:supergroup:drwxr-xr-x
>>         at
>> org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.check(FSPermissionChecker.java:205)
>>         at
>> org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.check(FSPermissionChecker.java:186)
>>
>> When I create the file system I have the user hdfs on the root folder.
>> (/). I am not sure now to have both the user mapred and hdfs have access to
>> the root (which it seems these errors are indicating).
>>
>> I get a page from 50070 put when I try to browse the filesystem from the
>> web UI I get an error that there are no nodes listening (I have 3 data
>> nodes and 1 namenode). The browser indicates that there is nothing
>> listening to port 50030, so it seems that the JobTracker is not up.
>>
>
>