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From YIMEN YIMGA Gael <gael.yimen-yi...@sgcib.com>
Subject RE: Error and problem when running a hadoop job
Date Tue, 09 Sep 2014 16:36:52 GMT

When I run the following command to launch DATANODE as shown in the screenshot below, all
is ok
But when I run JPS command, I do not see the datanode process


That’s where my worry is ☹ ☹

Standing by ….

From: vivek [mailto:vivvekbharat@gmail.com]
Sent: Tuesday 9 September 2014 17:27
To: user@hadoop.apache.org
Subject: Re: Error and problem when running a hadoop job

check whether datanode is started.

On Tue, Sep 9, 2014 at 7:26 PM, YIMEN YIMGA Gael <gael.yimen-yimga@sgcib.com<mailto:gael.yimen-yimga@sgcib.com>>
Yes, all about ssh access, have been done.

My cluster is a single node cluster.

Standing by …

From: Sandeep Khurana [mailto:skhurana333@gmail.com<mailto:skhurana333@gmail.com>]
Sent: Tuesday 9 September 2014 15:54
To: user@hadoop.apache.org<mailto:user@hadoop.apache.org>
Subject: Re: Error and problem when running a hadoop job

I hope you did do passphrase less ssh access to localhost by generating keys etc?
On Sep 9, 2014 7:18 PM, "YIMEN YIMGA Gael" <gael.yimen-yimga@sgcib.com<mailto:gael.yimen-yimga@sgcib.com>>
Hello Dear hadoopers,

I hope you are doing well.

I tried to run WordCount.jar file to experience running hadoop jobs. After launching the program
as shown in the screenshot below, I have the message in the screenshot.
The job tries to connect to the datanode. But failed after 10 attempts, I got the error in
the second screenshot.
After that, I first stop all the Hadoop deamons, second format the dfs, third re-launch Hadoop
deamons, and I notice using the JPS command that DATANODE is not running.
I then run the datanode alone with the command bin/hadoop –deamon.sh  start datanode as
shown in the third screenshot, but the datanode is still not up and running.

Could someone advice in this case, please ?

Standing by for your habitual support.

Thank in advance.





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