PawasChhokra commented on a change in pull request #1446: URL: https://github.com/apache/samza/pull/1446#discussion_r546164722
########## File path: samza-core/src/main/java/org/apache/samza/clustermanager/FaultDomainManager.java ########## @@ -0,0 +1,57 @@ +/* + * 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.samza.clustermanager; + +import java.util.Set; +import org.apache.samza.annotation.InterfaceStability; + +/** + * This interface gets fault domain information of all hosts that are running in the cluster, + * from the cluster manager (Yarn/Kubernetes/etc.). + * It also provides other functionality like exposing all the available fault domains, checking if two hosts belong to + * the same fault domain, and getting the valid fault domains that a container can be placed on (for ex: based on standby constraints). + * The host to fault domain map used here will always be cached and only updated in case the AM dies or an active + * container is assigned to a host which is not in the map. + * This is not thread-safe. + */ [email protected] +public interface FaultDomainManager { + + /** + * This method returns all the last cached fault domain values in a cluster, for all hosts that are healthy, up and running. Review comment: Done. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected]
