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From "Hudson (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, 26 Nov 2011 18:11:40 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7777?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13157571#comment-13157571
] 

Hudson commented on HADOOP-7777:
--------------------------------

Integrated in Hadoop-Mapreduce-trunk-Commit #1346 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk-Commit/1346/])
    HADOOP-7777 a base class for DNSToSwitchMapping implementations

stevel : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1206515
Files : 
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/AbstractDNSToSwitchMapping.java
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/CachedDNSToSwitchMapping.java
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/DNSToSwitchMapping.java
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/ScriptBasedMapping.java
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/net/StaticMapping.java
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/net/TestScriptBasedMapping.java
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/net/TestStaticMapping.java
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/net/TestSwitchMapping.java

                
> 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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