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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8469) Make NetworkTopology class pluggable
Date Mon, 03 Jun 2013 07:38:21 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8469?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13672873#comment-13672873
] 

Hudson commented on HADOOP-8469:
--------------------------------

Integrated in Hadoop-trunk-Commit #3836 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/3836/])
    Move HADOOP-8469 and HADOOP-8470 to 2.1.0-beta in CHANGES.txt. (Revision 1488873)

     Result = SUCCESS
szetszwo : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1488873
Files : 
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/CHANGES.txt

                
> Make NetworkTopology class pluggable
> ------------------------------------
>
>                 Key: HADOOP-8469
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8469
>             Project: Hadoop Common
>          Issue Type: Sub-task
>    Affects Versions: 1.0.0, 2.0.0-alpha
>            Reporter: Junping Du
>            Assignee: Junping Du
>             Fix For: 1.2.0, 2.1.0-beta
>
>         Attachments: HADOOP-8469-branch-2-02.patch, HADOOP-8469-branch-2.patch, HADOOP-8469-NetworkTopology-pluggable.patch,
HADOOP-8469-NetworkTopology-pluggable-v2.patch, HADOOP-8469-NetworkTopology-pluggable-v3.patch,
HADOOP-8469-NetworkTopology-pluggable-v4.patch, HADOOP-8469-NetworkTopology-pluggable-v5.patch
>
>
> The class NetworkTopology is where the three-layer hierarchical topology is modeled in
the current code base and is instantiated directly by the DatanodeManager and Balancer.
> To support alternative topologies, changes were make the topology class pluggable, that
is to support using a user specified topology class specified in the Hadoop configuration
file core-defaul.xml. The user specified topology class is instantiated using reflection in
the same manner as other customizable classes in Hadoop. If no use specified topology class
is found, the fallback is to use the NetworkTopology to preserve current behavior. To make
it possible to reuse code in NetworkTopology several minor changes were made to make the class
more extensible. The NetworkTopology class is currently annotated with @InterfaceAudience.LimitedPrivate({"HDFS",
"MapReduce"}) and @InterfaceStability.Unstable.
> The proposed changes in NetworkTopology listed below
> 1. Some fields were changes from private to protected
> 2. Added some protected methods so that sub classes could override behavior
> 3. Added a new method,isNodeGroupAware,to NetworkTopology
> 4. The inner class InnerNode was made a package protected class to it would be easier
to subclass

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