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Date: Sat, 5 Nov 2011 15:24:51 +0000 (UTC)
From: "Hadoop QA (Commented) (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (HADOOP-7777) Implement a base class for
 DNSToSwitchMapping implementations that can offer extra topology
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    [ https://issues.apache.org/jira/browse/HADOOP-7777?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13144720#comment-13144720 ] 

Hadoop QA commented on HADOOP-7777:
-----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12502596/HADOOP-7777-switch.patch
  against trunk revision .

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

    +1 tests included.  The patch appears to include 10 new or modified tests.

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

    -1 javac.  The applied patch generated 1040 javac compiler warnings (more than the trunk's current 1039 warnings).

    -1 findbugs.  The patch appears to introduce 7 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/360//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HADOOP-Build/360//artifact/trunk/hadoop-common-project/patchprocess/newPatchFindbugsWarningshadoop-common.html
Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/360//console

This message is automatically generated.
                
> Implement a base class for DNSToSwitchMapping implementations that can offer extra topology information
> -------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-7777
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7777
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: util
>    Affects Versions: 0.23.0, 0.24.0
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>         Attachments: HADOOP-7777-switch.patch, HADOOP-7777-switch.patch, HADOOP-7777-switch.patch
>
>
> HDFS-2492 has identified a need for DNSToSwitchMapping implementations to provide a bit more topology information (e.g. whether or not there are multiple switches). This could be done by writing an extended interface, querying its methods if present and coming up with a default action if there is no extended interface. 
> Alternatively, we have a base class that all the standard mappings implement, with a boolean isMultiRack() method; all the standard subclasses would extend this, as could any third party topology provider. The advantage of this approach is that it is easier to add new operations without going into a multi-interface mess.

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