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From Peyman Mohajerian <mohaj...@gmail.com>
Subject Re: Job Tracker not running, Permission denied
Date Sat, 15 Feb 2014 19:14:21 GMT
Maybe you just have to add 'mapred' user to the group that owns the 'hdfs'
root directory, it seems the group name is called: 'hdfs'.



On Sat, Feb 15, 2014 at 9:56 AM, Panshul Whisper <ouchwhisper@gmail.com>wrote:

> Hello,
>
> I had a Cloudera Hadoop cluster running on AWS EC2 instances. I used the
> Cloudera Manager to setup and configure the cluster. It is a CDH 4.4.0
> version package.
>
> Everything was running fine till I got a mail from Amazon saying that I
> need to re-instantiate one of my EC2 instances and create a new one as the
> old one was to be terminated. Un-luckily it was the the Master Node.
> So I did the following:
>
>    1. Made an image of the running Master Node instance.
>    2. Stopped the cluster services from the cloudera manager.
>    3. Terminated the existing the node.
>    4. Setup a new node with the AMI image of old Master node.
>    5. Configured the same private IP Address as the old master node, so
>    it also got the same DNS address.
>    6. Since the new machine was a clone of the old master node. I did not
>    change anything.
>    7. I restarted all the services from  Cloudera Manager.
>    8. NameNode failed to start saying that DFS was not formatted.
>    9. I formatted the DFS from the Cloudera Manager form the NameNode
>    service menu.
>    10. The restarted the HDFS service with the Namenode service,
>    Successfully.
>    11. Now All the Task Trackers are running.
>    12. I can access the Master Node with the old SSH keys and the old IP
>    Adress.
>    13. But the Task Tracker on the name node gives an error while
>    starting up.
>    14. It gives the following error: *org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.security.AccessControlException):
>    Permission denied: user=mapred, access=WRITE,
>    inode="/":hdfs:supergroup:drwxr-xr-x*
>
> Please help me resolve this error. Earlier also I did not have a user
> named mapred. Everything was running fine with the user hdfs.
>
> Thanking You,
>
> --
> Regards,
> Ouch Whisper
> 010101010101
>

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