bipinprasad commented on a change in pull request #3379: URL: https://github.com/apache/storm/pull/3379#discussion_r593424759
########## File path: storm-server/src/main/java/org/apache/storm/scheduler/resource/strategies/scheduling/sorter/NodeSorterHostProximity.java ########## @@ -0,0 +1,712 @@ +/* + * 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.storm.scheduler.resource.strategies.scheduling.sorter; + +import java.util.ArrayList; +import java.util.Collection; +import java.util.Collections; +import java.util.Comparator; +import java.util.HashMap; +import java.util.HashSet; +import java.util.Iterator; +import java.util.List; +import java.util.Map; +import java.util.NoSuchElementException; +import java.util.Set; +import java.util.TreeSet; +import java.util.concurrent.atomic.AtomicInteger; +import java.util.stream.Collectors; +import java.util.stream.Stream; +import org.apache.storm.Config; +import org.apache.storm.networktopography.DNSToSwitchMapping; +import org.apache.storm.scheduler.Cluster; +import org.apache.storm.scheduler.ExecutorDetails; +import org.apache.storm.scheduler.SchedulerAssignment; +import org.apache.storm.scheduler.TopologyDetails; +import org.apache.storm.scheduler.WorkerSlot; +import org.apache.storm.scheduler.resource.RasNode; +import org.apache.storm.scheduler.resource.RasNodes; +import org.apache.storm.scheduler.resource.normalization.NormalizedResourceOffer; +import org.apache.storm.scheduler.resource.normalization.NormalizedResourceRequest; +import org.apache.storm.scheduler.resource.strategies.scheduling.BaseResourceAwareStrategy; +import org.apache.storm.scheduler.resource.strategies.scheduling.ObjectResourcesItem; +import org.apache.storm.scheduler.resource.strategies.scheduling.ObjectResourcesSummary; +import org.apache.storm.shade.com.google.common.annotations.VisibleForTesting; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +public class NodeSorterHostProximity implements INodeSorter { + private static final Logger LOG = LoggerFactory.getLogger(NodeSorterHostProximity.class); + + // instance variables from class instantiation + protected final BaseResourceAwareStrategy.NodeSortType nodeSortType; + + protected Cluster cluster; + protected TopologyDetails topologyDetails; + + // Instance variables derived from Cluster. + private final Map<String, List<String>> networkTopography; + private final Map<String, String> superIdToRack = new HashMap<>(); + private final Map<String, List<RasNode>> hostnameToNodes = new HashMap<>(); + private final Map<String, String> nodeIdToHostname = new HashMap<>(); + private final Map<String, Set<String>> rackIdToHosts = new HashMap<>(); + protected List<String> greyListedSupervisorIds; + + // Instance variables from Cluster and TopologyDetails. + protected List<String> favoredNodeIds; + protected List<String> unFavoredNodeIds; + + // Updated in prepare method + ExecutorDetails exec; + + public NodeSorterHostProximity(Cluster cluster, TopologyDetails topologyDetails) { + this(cluster, topologyDetails, BaseResourceAwareStrategy.NodeSortType.COMMON); + } + + /** + * Initialize for the default implementation node sorting. + * + * <p> + * <li>{@link BaseResourceAwareStrategy.NodeSortType#GENERIC_RAS} sorting implemented in + * {@link #sortObjectResourcesGeneric(ObjectResourcesSummary, ExecutorDetails, NodeSorterHostProximity.ExistingScheduleFunc)}</li> + * <li>{@link BaseResourceAwareStrategy.NodeSortType#DEFAULT_RAS} sorting implemented in + * {@link #sortObjectResourcesDefault(ObjectResourcesSummary, NodeSorterHostProximity.ExistingScheduleFunc)}</li> + * <li>{@link BaseResourceAwareStrategy.NodeSortType#COMMON} sorting implemented in + * {@link #sortObjectResourcesCommon(ObjectResourcesSummary, ExecutorDetails, NodeSorterHostProximity.ExistingScheduleFunc)}</li> + * </p> + * + * @param cluster for which nodes will be sorted. + * @param topologyDetails the topology to sort for. + * @param nodeSortType type of sorting to be applied to object resource collection {@link BaseResourceAwareStrategy.NodeSortType}. + */ + public NodeSorterHostProximity(Cluster cluster, TopologyDetails topologyDetails, BaseResourceAwareStrategy.NodeSortType nodeSortType) { + this.cluster = cluster; + this.topologyDetails = topologyDetails; + this.nodeSortType = nodeSortType; + + // from Cluster + networkTopography = cluster.getNetworkTopography(); + greyListedSupervisorIds = cluster.getGreyListedSupervisors(); + Map<String, String> hostToRack = cluster.getHostToRack(); + RasNodes nodes = new RasNodes(cluster); + for (RasNode node: nodes.getNodes()) { + String superId = node.getId(); + String hostName = node.getHostname(); + if (!node.isAlive() || hostName == null) { + continue; + } + String rackId = hostToRack.getOrDefault(hostName, DNSToSwitchMapping.DEFAULT_RACK); + superIdToRack.put(superId, rackId); + hostnameToNodes.computeIfAbsent(hostName, (hn) -> new ArrayList<>()).add(node); + nodeIdToHostname.put(superId, hostName); + rackIdToHosts.computeIfAbsent(rackId, r -> new HashSet<>()).add(hostName); + } + + // from TopologyDetails + Map<String, Object> topoConf = topologyDetails.getConf(); + + // From Cluster and TopologyDetails - and cleaned-up + favoredNodeIds = makeHostToNodeIds((List<String>) topoConf.get(Config.TOPOLOGY_SCHEDULER_FAVORED_NODES)); + unFavoredNodeIds = makeHostToNodeIds((List<String>) topoConf.get(Config.TOPOLOGY_SCHEDULER_UNFAVORED_NODES)); + favoredNodeIds.removeAll(greyListedSupervisorIds); + unFavoredNodeIds.removeAll(greyListedSupervisorIds); + unFavoredNodeIds.removeAll(favoredNodeIds); + } + + @VisibleForTesting + public Map<String, Set<String>> getRackIdToHosts() { + return rackIdToHosts; + } + + @Override + public void prepare(ExecutorDetails exec) { + this.exec = exec; + } + + /** + * Scheduling uses {@link #sortAllNodes()} which eventually + * calls this method whose behavior can altered by setting {@link #nodeSortType}. 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