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From "Hadoop QA (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8232) Provide a command line entry point to view/test topology options
Date Fri, 30 Mar 2012 17:18:29 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8232?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13242558#comment-13242558
] 

Hadoop QA commented on HADOOP-8232:
-----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12520625/HADOOP-8232.patch
  against trunk revision .

    +1 @author.  The patch does not contain any @author tags.

    -1 tests included.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 eclipse:eclipse.  The patch built with eclipse:eclipse.

    +1 findbugs.  The patch does not introduce any new Findbugs (version 1.3.9) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit
warnings.

    +1 core tests.  The patch passed unit tests in .

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HADOOP-Build/803//testReport/
Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/803//console

This message is automatically generated.
                
> Provide a command line entry point to view/test topology options
> ----------------------------------------------------------------
>
>                 Key: HADOOP-8232
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8232
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: util
>    Affects Versions: 0.23.1
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Minor
>         Attachments: HADOOP-8232.patch
>
>
> Add a new command line entry point "topo" with commands for preflight checking of a clusters
topology setup. 
> The initial operations would be to list the implementation class of the mapper, and attempt
to load it, resolve a set of supplied hostnames, then dump the topology map after the resolution
process.
> Target audience: 
> # ops teams trying to get a new/changed script working before deploying it on a cluster.
> # someone trying to write their first script.
> Resolve and list the rack mappings of the given host
> {code}
> hadoop topo test [host1] [host2] ... 
> {code}
> This would load the hostnames from a given file, resolve all of them and list the results:
> {code}
> hadoop topo testfile filename
> {code}
>  This version is intended for the ops team who have a list of hostnames, IP addresses.

> * Rather than just list them, the ops team may want to mandate that there were no /default-rack
mappings found, as that is invariably a sign that the script isn't handling a hostname properly.
> * No attempt to be clever and do IP address resolution, FQDN to hostname mapping, etc.

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