| /** |
| * 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.resourcemanager.scheduler.fair; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.yarn.api.records.Priority; |
| import org.apache.hadoop.yarn.api.records.Resource; |
| import org.apache.hadoop.yarn.api.records.ResourceRequest; |
| import org.apache.hadoop.yarn.server.resourcemanager.scheduler.ClusterNodeTracker; |
| |
| import java.util.HashMap; |
| import java.util.HashSet; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| |
| /** |
| * Applications place {@link ResourceRequest}s at multiple levels. This is a |
| * helper class that allows tracking if a {@link ResourceRequest} has been |
| * visited at a different locality level. |
| * |
| * This is implemented for {@link FSAppAttempt#getStarvedResourceRequests()}. |
| * The implementation is not thread-safe. |
| */ |
| class VisitedResourceRequestTracker { |
| private static final Log LOG = |
| LogFactory.getLog(VisitedResourceRequestTracker.class); |
| private final Map<Priority, Map<Resource, TrackerPerPriorityResource>> map = |
| new HashMap<>(); |
| private final ClusterNodeTracker<FSSchedulerNode> nodeTracker; |
| |
| VisitedResourceRequestTracker( |
| ClusterNodeTracker<FSSchedulerNode> nodeTracker) { |
| this.nodeTracker = nodeTracker; |
| } |
| |
| /** |
| * Check if the {@link ResourceRequest} is visited before, and track it. |
| * @param rr {@link ResourceRequest} to visit |
| * @return true if <code>rr</code> is the first visit across all |
| * locality levels, false otherwise |
| */ |
| boolean visit(ResourceRequest rr) { |
| Priority priority = rr.getPriority(); |
| Resource capability = rr.getCapability(); |
| |
| Map<Resource, TrackerPerPriorityResource> subMap = map.get(priority); |
| if (subMap == null) { |
| subMap = new HashMap<>(); |
| map.put(priority, subMap); |
| } |
| |
| TrackerPerPriorityResource tracker = subMap.get(capability); |
| if (tracker == null) { |
| tracker = new TrackerPerPriorityResource(); |
| subMap.put(capability, tracker); |
| } |
| |
| return tracker.visit(rr.getResourceName()); |
| } |
| |
| private class TrackerPerPriorityResource { |
| private Set<String> racksWithNodesVisited = new HashSet<>(); |
| private Set<String> racksVisted = new HashSet<>(); |
| private boolean anyVisited; |
| |
| private boolean visitAny() { |
| if (racksVisted.isEmpty() && racksWithNodesVisited.isEmpty()) { |
| anyVisited = true; |
| } |
| return anyVisited; |
| } |
| |
| private boolean visitRack(String rackName) { |
| if (anyVisited || racksWithNodesVisited.contains(rackName)) { |
| return false; |
| } else { |
| racksVisted.add(rackName); |
| return true; |
| } |
| } |
| |
| private boolean visitNode(String rackName) { |
| if (anyVisited || racksVisted.contains(rackName)) { |
| return false; |
| } else { |
| racksWithNodesVisited.add(rackName); |
| return true; |
| } |
| } |
| |
| /** |
| * Based on whether <code>resourceName</code> is a node, rack or ANY, |
| * check if this has been visited earlier. |
| * |
| * A node is considered visited if its rack or ANY have been visited. |
| * A rack is considered visited if any nodes or ANY have been visited. |
| * Any is considered visited if any of the nodes/racks have been visited. |
| * |
| * @param resourceName nodename or rackname or ANY |
| * @return true if this is the first visit, false otherwise |
| */ |
| private boolean visit(String resourceName) { |
| if (resourceName.equals(ResourceRequest.ANY)) { |
| return visitAny(); |
| } |
| |
| List<FSSchedulerNode> nodes = |
| nodeTracker.getNodesByResourceName(resourceName); |
| int numNodes = nodes.size(); |
| if (numNodes == 0) { |
| LOG.error("Found ResourceRequest for a non-existent node/rack named " + |
| resourceName); |
| return false; |
| } |
| |
| if (numNodes == 1) { |
| // Found a single node. To be safe, let us verify it is a node and |
| // not a rack with a single node. |
| FSSchedulerNode node = nodes.get(0); |
| if (node.getNodeName().equals(resourceName)) { |
| return visitNode(node.getRackName()); |
| } |
| } |
| |
| // At this point, it is not ANY or a node. Must be a rack |
| return visitRack(resourceName); |
| } |
| } |
| } |