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HDFS-3495. Update Balancer to support new NetworkTopology with NodeGroup. Contributed by Junping Du

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git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1414878 13f79535-47bb-0310-9956-ffa450edef68
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Tsz-wo Sze 2012-11-28 19:41:57 +00:00
parent 1634e980af
commit 833b928adf
1 changed files with 16 additions and 0 deletions
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16
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/NetworkTopology.java
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@ -28,6 +28,9 @@
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.CommonConfigurationKeysPublic;
import org.apache.hadoop.util.ReflectionUtils;
/** The class represents a cluster of computer with a tree hierarchical
* network topology.
@ -52,6 +55,19 @@ public InvalidTopologyException(String msg) {
super(msg);
}
}
/**
* Get an instance of NetworkTopology based on the value of the configuration
* parameter net.topology.impl.
*
* @param conf the configuration to be used
* @return an instance of NetworkTopology
*/
public static NetworkTopology getInstance(Configuration conf){
return ReflectionUtils.newInstance(
conf.getClass(CommonConfigurationKeysPublic.NET_TOPOLOGY_IMPL_KEY,
NetworkTopology.class, NetworkTopology.class), conf);
}
/** InnerNode represents a switch/router of a data center or rack.
* Different from a leaf node, it has non-null children.