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From "Junping Du (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-8469) Make NetworkTopology class pluggable and support user specified topology class
Date Mon, 04 Jun 2012 05:10:22 GMT
Junping Du created HADOOP-8469:

             Summary: Make NetworkTopology class pluggable and support user specified topology
                 Key: HADOOP-8469
                 URL: https://issues.apache.org/jira/browse/HADOOP-8469
             Project: Hadoop Common
          Issue Type: Sub-task
    Affects Versions: 2.0.0-alpha, 1.0.0
            Reporter: Junping Du
            Assignee: Junping Du

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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