hadoop PriorityRouterPolicy 源码
haddop PriorityRouterPolicy 代码
文件路径：/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/main/java/org/apache/hadoop/yarn/server/federation/policies/router/PriorityRouterPolicy.java
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with this
* work for additional information regarding copyright ownership. The ASF
* licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package org.apache.hadoop.yarn.server.federation.policies.router;
import java.util.Map;
import org.apache.hadoop.yarn.exceptions.YarnException;
import org.apache.hadoop.yarn.server.federation.policies.exceptions.FederationPolicyException;
import org.apache.hadoop.yarn.server.federation.store.records.SubClusterId;
import org.apache.hadoop.yarn.server.federation.store.records.SubClusterIdInfo;
import org.apache.hadoop.yarn.server.federation.store.records.SubClusterInfo;
/**
* This implements a policy that interprets "weights" as a ordered list of
* preferences among sub-clusters. Highest weight among active subclusters is
* chosen.
*/
public class PriorityRouterPolicy extends AbstractRouterPolicy {
@Override
protected SubClusterId chooseSubCluster(
String queue, Map<SubClusterId, SubClusterInfo> preSelectSubclusters) throws YarnException {
// This finds the sub-cluster with the highest weight among the
// currently active ones.
Map<SubClusterIdInfo, Float> weights = getPolicyInfo().getRouterPolicyWeights();
SubClusterId chosen = null;
Float currentBest = Float.MIN_VALUE;
for (SubClusterId id : preSelectSubclusters.keySet()) {
SubClusterIdInfo idInfo = new SubClusterIdInfo(id);
if (weights.containsKey(idInfo) && weights.get(idInfo) > currentBest) {
currentBest = weights.get(idInfo);
chosen = id;
}
}
if (chosen == null) {
throw new FederationPolicyException(
"No Active Subcluster with weight vector greater than zero.");
}
return chosen;
}
}
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