Thank ou guys I got everything i needed working

On Fri, Oct 5, 2012 at 3:29 PM, Chris Nauroth <cnauroth@hortonworks.com> wrote:
BTW, additional details on impersonation are here, including information about a piece of configuration required to allow use of doAs.

http://hadoop.apache.org/docs/r1.0.3/Secure_Impersonation.html

Thank you,
--Chris


On Fri, Oct 5, 2012 at 7:42 AM, Oleg Zhurakousky <oleg.zhurakousky@gmail.com> wrote:
sorry clicked send too soon, but basically changing that did not produce any result, still seeing the same message.So I guess my question is what is the property that is responsible for that?

Thanks
Oleg


On Fri, Oct 5, 2012 at 10:40 AM, Oleg Zhurakousky <oleg.zhurakousky@gmail.com> wrote:
Yes I understand that and I guess I am trying to find that 'right property' 
I did find one reference to it in hdfs-defaul.xml 

<name>dfs.datanode.address</name>

<value>0.0.0.0:50010</value>

so i changed that in my hdfs-site.xml to 

<name>dfs.datanode.address</name>

<value>192.168.15.20:50010</value>


But 


On Fri, Oct 5, 2012 at 10:33 AM, Bertrand Dechoux <dechouxb@gmail.com> wrote:
Indeed, you are connecting to localhost and you said it was a remote connection so I guess there is nothing there which is relevant for you.
The main idea is that you need to provide the configuration files. They are read by default from the classpath. Any place where you have a Configuration/JobConf you could also set up the right properties which would be the location of the HDFS master (and mapred if you want to do something about it).

Regards

Bertrand


On Fri, Oct 5, 2012 at 4:15 PM, Oleg Zhurakousky <oleg.zhurakousky@gmail.com> wrote:
So now I am passed it and able to RunAs 'hduser', but when I attempt to read from FSDataInputStream i see this message in my console

10:12:10,065  WARN main hdfs.DFSClient:2106 - Failed to connect to /127.0.0.1:50010, add to deadNodes and continuejava.net.ConnectException: Connection refused

10:12:10,072  INFO main hdfs.DFSClient:2272 - Could not obtain block blk_-4047236896256451627_1003 from any node: java.io.IOException: No live nodes contain current block. Will get new block locations from namenode and retry...


I am obviously missing a configuration setting somewhere. . . any idea?

Thanks

Oleg


On Fri, Oct 5, 2012 at 9:37 AM, Oleg Zhurakousky <oleg.zhurakousky@gmail.com> wrote:
After i clicked send I found the same link ;), but thank you anyway.

Oleg


On Fri, Oct 5, 2012 at 9:34 AM, Bertrand Dechoux <dechouxb@gmail.com> wrote:
Hi,

You might be looking for something like :
UserGroupInformation.createRemoteUser(user).doAs(

see
http://hadoop.apache.org/docs/r1.0.3/api/org/apache/hadoop/security/UserGroupInformation.html

It is a JAAS wrapper for Hadoop.

Regards

Bertrand




On Fri, Oct 5, 2012 at 3:19 PM, Oleg Zhurakousky <oleg.zhurakousky@gmail.com> wrote:
I am working on some samples where I want to write to HDFS running on another machine (different OS etc.)
The identity of my client process is just whatever my OS says it is (e.g., 'oleg') hence:

08:56:49,240 DEBUG IPC Client (47) connection to /192.168.15.20:54310 from oleg ipc.Client:803 - IPC Client (47) connection to /192.168.15.20:54310 from oleg got value #2 

But there is no 'oleg' where the hadoop is running. Instead there is 'hduser'. 

Is there a way or an equivalent of "RunAs" in hadoop?

Thanks
Oleg



--
Bertrand Dechoux





--
Bertrand Dechoux