| /* |
| * 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.hdds.scm.node.states; |
| |
| import java.util.HashSet; |
| import java.util.Set; |
| import java.util.UUID; |
| |
| import org.apache.hadoop.hdds.scm.container.ContainerID; |
| import org.apache.hadoop.hdds.scm.exceptions.SCMException; |
| |
| import com.google.common.annotations.VisibleForTesting; |
| import com.google.common.base.Preconditions; |
| import static org.apache.hadoop.hdds.scm.exceptions.SCMException.ResultCodes |
| .NO_SUCH_DATANODE; |
| |
| /** |
| * This data structure maintains the list of containers that is on a datanode. |
| * This information is built from the DN container reports. |
| */ |
| public class Node2ContainerMap extends Node2ObjectsMap<ContainerID> { |
| |
| /** |
| * Constructs a Node2ContainerMap Object. |
| */ |
| public Node2ContainerMap() { |
| super(); |
| } |
| |
| /** |
| * Returns null if there no containers associated with this datanode ID. |
| * |
| * @param datanode - UUID |
| * @return Set of containers or Null. |
| */ |
| public Set<ContainerID> getContainers(UUID datanode) { |
| return getObjects(datanode); |
| } |
| |
| /** |
| * Insert a new datanode into Node2Container Map. |
| * |
| * @param datanodeID -- Datanode UUID |
| * @param containerIDs - List of ContainerIDs. |
| */ |
| @Override |
| public void insertNewDatanode(UUID datanodeID, Set<ContainerID> containerIDs) |
| throws SCMException { |
| super.insertNewDatanode(datanodeID, containerIDs); |
| } |
| |
| /** |
| * Updates the Container list of an existing DN. |
| * |
| * @param datanodeID - UUID of DN. |
| * @param containers - Set of Containers tht is present on DN. |
| * @throws SCMException - if we don't know about this datanode, for new DN |
| * use addDatanodeInContainerMap. |
| */ |
| public void setContainersForDatanode(UUID datanodeID, |
| Set<ContainerID> containers) throws SCMException { |
| Preconditions.checkNotNull(datanodeID); |
| Preconditions.checkNotNull(containers); |
| if (dn2ObjectMap |
| .computeIfPresent(datanodeID, (k, v) -> new HashSet<>(containers)) |
| == null) { |
| throw new SCMException("No such datanode", NO_SUCH_DATANODE); |
| } |
| } |
| |
| @VisibleForTesting |
| @Override |
| public int size() { |
| return dn2ObjectMap.size(); |
| } |
| } |