hadoop HashBasedRouterPolicy 源码
haddop HashBasedRouterPolicy 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/HashBasedRouterPolicy.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.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import org.apache.hadoop.yarn.exceptions.YarnException;
import org.apache.hadoop.yarn.server.federation.policies.FederationPolicyInitializationContext;
import org.apache.hadoop.yarn.server.federation.policies.FederationPolicyInitializationContextValidator;
import org.apache.hadoop.yarn.server.federation.policies.exceptions.FederationPolicyInitializationException;
import org.apache.hadoop.yarn.server.federation.store.records.SubClusterId;
import org.apache.hadoop.yarn.server.federation.store.records.SubClusterInfo;
/**
* This {@link FederationRouterPolicy} pick a subcluster based on the hash of
* the job's queue name. Useful to provide a default behavior when too many
* queues exist in a system. This also ensures that all jobs belonging to a
* queue are mapped to the same sub-cluster (likely help with locality).
*/
public class HashBasedRouterPolicy extends AbstractRouterPolicy {
@Override
public void reinitialize(
FederationPolicyInitializationContext federationPolicyContext)
throws FederationPolicyInitializationException {
FederationPolicyInitializationContextValidator
.validate(federationPolicyContext, this.getClass().getCanonicalName());
// note: this overrides BaseRouterPolicy and ignores the weights
setPolicyContext(federationPolicyContext);
}
@Override
protected SubClusterId chooseSubCluster(String queue,
Map<SubClusterId, SubClusterInfo> preSelectSubclusters) throws YarnException {
int chosenPosition = Math.abs(queue.hashCode() % preSelectSubclusters.size());
List<SubClusterId> list = new ArrayList<>(preSelectSubclusters.keySet());
Collections.sort(list);
return list.get(chosenPosition);
}
}
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