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From "Hadoop QA (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7777) Implement a base class for DNSToSwitchMapping implementations that can offer extra topology information
Date Sat, 19 Nov 2011 18:22:52 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7777?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13153547#comment-13153547
] 

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

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12504251/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 appears to have generated 15 warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler 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/387//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HADOOP-Build/387//artifact/trunk/hadoop-common-project/patchprocess/newPatchFindbugsWarningshadoop-common.html
Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/387//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,
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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