hadoop AlwaysRestartPolicy 源码
haddop AlwaysRestartPolicy 代码
文件路径：/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-services/hadoop-yarn-services-core/src/main/java/org/apache/hadoop/yarn/service/component/AlwaysRestartPolicy.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
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* 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.service.component;
import org.apache.hadoop.yarn.api.records.ContainerStatus;
import org.apache.hadoop.yarn.service.component.instance.ComponentInstance;
/**
* Always restart policy allows for restarts for long live components which
* never terminate.
*/
public final class AlwaysRestartPolicy implements ComponentRestartPolicy {
private static AlwaysRestartPolicy INSTANCE = new AlwaysRestartPolicy();
private AlwaysRestartPolicy() {
}
public static AlwaysRestartPolicy getInstance() {
return INSTANCE;
}
@Override public boolean isLongLived() {
return true;
}
/**
* This is always false since these components never terminate
*
* @param component
* @return
*/
@Override public boolean hasCompleted(Component component) {
return false;
}
/**
* This is always false since these components never terminate
*
* @param component
* @return
*/
@Override public boolean hasCompletedSuccessfully(Component component) {
return false;
}
@Override public boolean shouldRelaunchInstance(
ComponentInstance componentInstance, ContainerStatus containerStatus) {
return true;
}
@Override public boolean isReadyForDownStream(Component dependentComponent) {
if (dependentComponent.getNumReadyInstances() < dependentComponent
.getNumDesiredInstances()) {
return false;
}
return true;
}
@Override public boolean allowUpgrades() {
return true;
}
@Override public boolean shouldTerminate(Component component) {
return false;
}
@Override public boolean allowContainerRetriesForInstance(
ComponentInstance componentInstance) {
return true;
}
}
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