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From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4744) Wrong resolution of hostname and port
Date Mon, 23 Feb 2009 16:38:04 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4744?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12675967#action_12675967
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Devaraj Das commented on HADOOP-4744:
-------------------------------------

David, we see this problem on one or two machines in a 2000 node cluster. So I guess if you
run the code snippet i had commented with earlier in a tight loop, you might hit the problem..

> Wrong resolution of hostname and port 
> --------------------------------------
>
>                 Key: HADOOP-4744
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4744
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.20.0
>            Reporter: Amareshwari Sriramadasu
>            Assignee: Devaraj Das
>            Priority: Blocker
>             Fix For: 0.20.0
>
>         Attachments: 4744.exception.patch, 4744.patch
>
>
> I noticed the following for one of the hosts in a cluster:
> 1. machines.jsp page resolves the http address as just "http://hostname" (which doesn't
work). It doesnt put the port number for the host. Even if I add the port number manually
in the URI, the  task tracker page does not come up. 
> 2. All the tasks(both maps and reduces) which ran on the machine ran successfully. But
tasklogs cannot be viewed, because port-number is not resolved. ( same problem as in (1)).
> 3. The reducers waiting for maps ran on that machine fail with connection failed errors
saying the hostname is 'null'.

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