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https://issues.apache.org/jira/browse/HADOOP-7777?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13158828#comment-13158828
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Hudson commented on HADOOP-7777:
--------------------------------
Integrated in Hadoop-Hdfs-0.23-Commit #220 (See
[https://builds.apache.org/job/Hadoop-Hdfs-0.23-Commit/220/])
Apply HADOOP-7777 to 0.23.1
stevel : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1207628
Files :
*
/hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/CHANGES.txt
*
/hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/AbstractDNSToSwitchMapping.java
*
/hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/CachedDNSToSwitchMapping.java
*
/hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/DNSToSwitchMapping.java
*
/hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/ScriptBasedMapping.java
*
/hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/net/StaticMapping.java
*
/hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/net/TestScriptBasedMapping.java
*
/hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/net/TestStaticMapping.java
*
/hadoop/common/branches/branch-0.23/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
> Fix For: 0.24.0, 0.23.1
>
> 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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