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MapReduce >> mail # user >> Issue when clicking on BrowseFileSystem

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Re: Issue when clicking on BrowseFileSystem
On Fri, Oct 12, 2012 at 11:42 AM, Kartashov, Andy
> You are absolutely right.  It was inded  "localhost..:"   in the URL. When I changed it to my IP address the page duly loaded. Which .xml file is responsible for this setting?

It depends on which URL, you left out that part of the answer. :) When
you click the link on dfsHealth.jsp, does the error page have
nn_browsedfscontent.jsp in the URL bar, or does it have
browseDirectory.jsp in the URL bar?

The NN address can be specified with dfs.namenode.http-address and the
DN with dfs.datanode.http.address but you shouldn't need to configure
those by hand, the code is supposed to be smart enough to figure it
out automatically. It works in my Hadoop 2.0.x configurations here, so
I'd like to track down what is different about your configuration in
case we need to fix the code to DTRT for that kind of configuration.

The first thing I would check is to make sure your server name is not
listed as in /etc/hosts on the server. Since this (arguably
broken) configuration is the default for some distros, it would be
nice if Hadoop could handle it automatically, but in my experience
things work much better when I delete that line from /etc/hosts.


> Cheers,
> Andy
> -----Original Message-----
> From: Andy Isaacson [mailto:[EMAIL PROTECTED]]
> Sent: Friday, October 12, 2012 2:10 PM
> Subject: Re: Issue when clicking on BrowseFileSystem
> Andy,
> It sounds like your namenode thinks the datanode is on localhost. The "browse the filesystem" URL gets its IP address from the DN registration message. Is the URL that throws dns_unresolved_hostname the nn_browsedfscontent.jsp URL, or the browseDirectory.jsp that it redirects to?
> What's your dfs.namenode.rpc-address and http-address settings? Are there any odd entries in /etc/hosts like having your hostname listed on a line?  Is this on a single-node cluster or a multi-node cluster?
> If none of the above seems diagnostic, what does the
> "NameSystem.registerDatanode: node registration from DatanodeRegistration(" log messages in your namenode log look like?
> -andy
> On Fri, Oct 12, 2012 at 10:20 AM, Kartashov, Andy <[EMAIL PROTECTED]> wrote:
>> hadoop version
>> Hadoop 2.0.0-cdh4.0.1
>> Subversion
>> file:///data/1/jenkins/workspace/generic-package-rhel64-6-0/topdir/BUI
>> LD/hadoop-2.0.0-cdh4.0.1/src/hadoop-common-project/hadoop-common
>> Andy Kartashov
>> Architecture R&D, Co-op
>> 1340 Pickering Parkway, Pickering, L1V 0C4
>> 1 Phone : (905) 837 6269
>> 6 Mobile: (416) 722 1787
>> -----Original Message-----
>> From: Harsh J [mailto:[EMAIL PROTECTED]]
>> Sent: Friday, October 12, 2012 11:41 AM
>> Subject: Re: Issue when clicking on BrowseFileSystem
>> What versions of Hadoop are you both running? I seem to have it working fine on a consistent networking environment setup.
>> On Fri, Oct 12, 2012 at 6:37 PM, Kartashov, Andy <[EMAIL PROTECTED]> wrote:
>>> I do too can open  <domain>:50070/dfshealth.jsp page and click NameNode Logs link however when I click on Browse the filesystem link I get the following:
>>> Network Error (dns_unresolved_hostname) Your requested host
>>> "localhost.localdomain" could not be resolved by DNS.
>>> For assistance, contact your network support team.
>>> Rgds,
>>> Andy
>>> -----Original Message-----
>>> From: Serge Blazhiyevskyy [mailto:[EMAIL PROTECTED]]
>>> Sent: Thursday, October 11, 2012 5:35 PM
>>> To: [EMAIL PROTECTED]; murthy nvvs
>>> Subject: Re: Issue when clicking on BrowseFileSystem
>>> Take a look at your conf files. Normally it is in hdfs-site.xml
>>> Look for name node name or address. Set it to loclahost or
>>> That might help.
>>> Serge
>>> On 10/11/12 2:31 PM, "Andy Isaacson" <[EMAIL PROTECTED]> wrote:
>>>>What Hadoop version did you install? Can you provide the .address