HADOOP-8468. Add NetworkTopologyWithNodeGroup, a 4-layer implementation of NetworkTopology. Contributed by Junping Du
git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1351163 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Tsz-wo Sze
parent
5572f73d45
commit
19ac5c4e8b
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@ -12,6 +12,9 @@ Trunk (unreleased changes)
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HADOOP-8469. Make NetworkTopology class pluggable. (Junping Du via
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szetszwo)
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HADOOP-8468. Add NetworkTopologyWithNodeGroup, a 4-layer implementation
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of NetworkTopology. (Junping Du via szetszwo)
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IMPROVEMENTS
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HADOOP-8017. Configure hadoop-main pom to get rid of M2E plugin execution
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@ -0,0 +1,398 @@
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/**
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.hadoop.net;
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import org.apache.hadoop.classification.InterfaceAudience;
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import org.apache.hadoop.classification.InterfaceStability;
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/**
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* The class extends NetworkTopology to represents a cluster of computer with
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* a 4-layers hierarchical network topology.
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* In this network topology, leaves represent data nodes (computers) and inner
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* nodes represent switches/routers that manage traffic in/out of data centers,
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* racks or physical host (with virtual switch).
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*
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* @see NetworkTopology
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*/
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@InterfaceAudience.LimitedPrivate({"HDFS", "MapReduce"})
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@InterfaceStability.Unstable
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public class NetworkTopologyWithNodeGroup extends NetworkTopology {
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public final static String DEFAULT_NODEGROUP = "/default-nodegroup";
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public NetworkTopologyWithNodeGroup() {
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clusterMap = new InnerNodeWithNodeGroup(InnerNode.ROOT);
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}
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@Override
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protected Node getNodeForNetworkLocation(Node node) {
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// if node only with default rack info, here we need to add default
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// nodegroup info
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if (NetworkTopology.DEFAULT_RACK.equals(node.getNetworkLocation())) {
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node.setNetworkLocation(node.getNetworkLocation()
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+ DEFAULT_NODEGROUP);
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}
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Node nodeGroup = getNode(node.getNetworkLocation());
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if (nodeGroup == null) {
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nodeGroup = new InnerNode(node.getNetworkLocation());
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}
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return getNode(nodeGroup.getNetworkLocation());
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}
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@Override
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public String getRack(String loc) {
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netlock.readLock().lock();
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try {
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loc = InnerNode.normalize(loc);
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Node locNode = getNode(loc);
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if (locNode instanceof InnerNodeWithNodeGroup) {
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InnerNodeWithNodeGroup node = (InnerNodeWithNodeGroup) locNode;
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if (node.isRack()) {
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return loc;
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} else if (node.isNodeGroup()) {
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return node.getNetworkLocation();
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} else {
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// may be a data center
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return null;
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}
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} else {
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// not in cluster map, don't handle it
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return loc;
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}
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} finally {
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netlock.readLock().unlock();
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}
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}
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/**
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* Given a string representation of a node group for a specific network
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* location
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*
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* @param loc
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* a path-like string representation of a network location
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* @return a node group string
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*/
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public String getNodeGroup(String loc) {
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netlock.readLock().lock();
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try {
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loc = InnerNode.normalize(loc);
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Node locNode = getNode(loc);
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if (locNode instanceof InnerNodeWithNodeGroup) {
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InnerNodeWithNodeGroup node = (InnerNodeWithNodeGroup) locNode;
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if (node.isNodeGroup()) {
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return loc;
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} else if (node.isRack()) {
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// not sure the node group for a rack
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return null;
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} else {
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// may be a leaf node
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return getNodeGroup(node.getNetworkLocation());
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}
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} else {
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// not in cluster map, don't handle it
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return loc;
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}
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} finally {
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netlock.readLock().unlock();
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}
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}
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@Override
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public boolean isOnSameRack( Node node1, Node node2) {
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if (node1 == null || node2 == null ||
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node1.getParent() == null || node2.getParent() == null) {
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return false;
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}
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netlock.readLock().lock();
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try {
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return isSameParents(node1.getParent(), node2.getParent());
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} finally {
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netlock.readLock().unlock();
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}
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}
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/**
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* Check if two nodes are on the same node group (hypervisor) The
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* assumption here is: each nodes are leaf nodes.
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*
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* @param node1
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* one node (can be null)
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* @param node2
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* another node (can be null)
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* @return true if node1 and node2 are on the same node group; false
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* otherwise
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* @exception IllegalArgumentException
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* when either node1 or node2 is null, or node1 or node2 do
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* not belong to the cluster
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*/
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@Override
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public boolean isOnSameNodeGroup(Node node1, Node node2) {
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if (node1 == null || node2 == null) {
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return false;
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}
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netlock.readLock().lock();
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try {
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return isSameParents(node1, node2);
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} finally {
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netlock.readLock().unlock();
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}
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}
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/**
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* Check if network topology is aware of NodeGroup
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*/
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@Override
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public boolean isNodeGroupAware() {
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return true;
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}
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/** Add a leaf node
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* Update node counter & rack counter if necessary
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* @param node node to be added; can be null
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* @exception IllegalArgumentException if add a node to a leave
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* or node to be added is not a leaf
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*/
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@Override
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public void add(Node node) {
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if (node==null) return;
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if( node instanceof InnerNode ) {
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throw new IllegalArgumentException(
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"Not allow to add an inner node: "+NodeBase.getPath(node));
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}
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netlock.writeLock().lock();
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try {
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Node rack = null;
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// if node only with default rack info, here we need to add default
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// nodegroup info
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if (NetworkTopology.DEFAULT_RACK.equals(node.getNetworkLocation())) {
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node.setNetworkLocation(node.getNetworkLocation() +
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NetworkTopologyWithNodeGroup.DEFAULT_NODEGROUP);
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}
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Node nodeGroup = getNode(node.getNetworkLocation());
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if (nodeGroup == null) {
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nodeGroup = new InnerNodeWithNodeGroup(node.getNetworkLocation());
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}
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rack = getNode(nodeGroup.getNetworkLocation());
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if (rack != null && !(rack instanceof InnerNode)) {
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throw new IllegalArgumentException("Unexpected data node "
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+ node.toString()
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+ " at an illegal network location");
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}
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if (clusterMap.add(node)) {
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LOG.info("Adding a new node: " + NodeBase.getPath(node));
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if (rack == null) {
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// We only track rack number here
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numOfRacks++;
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}
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}
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if(LOG.isDebugEnabled()) {
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LOG.debug("NetworkTopology became:\n" + this.toString());
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}
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} finally {
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netlock.writeLock().unlock();
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}
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}
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/** Remove a node
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* Update node counter and rack counter if necessary
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* @param node node to be removed; can be null
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*/
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@Override
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public void remove(Node node) {
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if (node==null) return;
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if( node instanceof InnerNode ) {
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throw new IllegalArgumentException(
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"Not allow to remove an inner node: "+NodeBase.getPath(node));
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}
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LOG.info("Removing a node: "+NodeBase.getPath(node));
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netlock.writeLock().lock();
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try {
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if (clusterMap.remove(node)) {
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Node nodeGroup = getNode(node.getNetworkLocation());
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if (nodeGroup == null) {
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nodeGroup = new InnerNode(node.getNetworkLocation());
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}
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InnerNode rack = (InnerNode)getNode(nodeGroup.getNetworkLocation());
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if (rack == null) {
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numOfRacks--;
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}
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}
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if(LOG.isDebugEnabled()) {
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LOG.debug("NetworkTopology became:\n" + this.toString());
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}
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} finally {
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netlock.writeLock().unlock();
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}
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}
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/** Sort nodes array by their distances to <i>reader</i>
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* It linearly scans the array, if a local node is found, swap it with
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* the first element of the array.
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* If a local node group node is found, swap it with the first element
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* following the local node.
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* If a local rack node is found, swap it with the first element following
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* the local node group node.
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* If neither local node, node group node or local rack node is found, put a
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* random replica location at position 0.
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* It leaves the rest nodes untouched.
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* @param reader the node that wishes to read a block from one of the nodes
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* @param nodes the list of nodes containing data for the reader
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*/
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@Override
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public void pseudoSortByDistance( Node reader, Node[] nodes ) {
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if (reader != null && !this.contains(reader)) {
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// if reader is not a datanode (not in NetworkTopology tree), we will
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// replace this reader with a sibling leaf node in tree.
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Node nodeGroup = getNode(reader.getNetworkLocation());
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if (nodeGroup != null && nodeGroup instanceof InnerNode) {
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InnerNode parentNode = (InnerNode) nodeGroup;
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// replace reader with the first children of its parent in tree
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reader = parentNode.getLeaf(0, null);
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} else {
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return;
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}
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}
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int tempIndex = 0;
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int localRackNode = -1;
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int localNodeGroupNode = -1;
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if (reader != null) {
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//scan the array to find the local node & local rack node
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for (int i = 0; i < nodes.length; i++) {
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if (tempIndex == 0 && reader == nodes[i]) { //local node
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//swap the local node and the node at position 0
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if (i != 0) {
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swap(nodes, tempIndex, i);
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}
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tempIndex=1;
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if (localRackNode != -1 && (localNodeGroupNode !=-1)) {
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if (localRackNode == 0) {
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localRackNode = i;
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}
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if (localNodeGroupNode == 0) {
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localNodeGroupNode = i;
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}
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break;
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}
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} else if (localNodeGroupNode == -1 && isOnSameNodeGroup(reader,
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nodes[i])) {
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//local node group
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localNodeGroupNode = i;
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// node local and rack local are already found
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if(tempIndex != 0 && localRackNode != -1) break;
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} else if (localRackNode == -1 && isOnSameRack(reader, nodes[i])) {
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localRackNode = i;
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if (tempIndex != 0 && localNodeGroupNode != -1) break;
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}
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}
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// swap the local nodegroup node and the node at position tempIndex
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if(localNodeGroupNode != -1 && localNodeGroupNode != tempIndex) {
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swap(nodes, tempIndex, localNodeGroupNode);
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if (localRackNode == tempIndex) {
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localRackNode = localNodeGroupNode;
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}
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tempIndex++;
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}
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// swap the local rack node and the node at position tempIndex
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if(localRackNode != -1 && localRackNode != tempIndex) {
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swap(nodes, tempIndex, localRackNode);
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tempIndex++;
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}
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}
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// put a random node at position 0 if there is not a local/local-nodegroup/
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// local-rack node
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if (tempIndex == 0 && localNodeGroupNode == -1 && localRackNode == -1
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&& nodes.length != 0) {
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swap(nodes, 0, r.nextInt(nodes.length));
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}
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}
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/** InnerNodeWithNodeGroup represents a switch/router of a data center, rack
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* or physical host. Different from a leaf node, it has non-null children.
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*/
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static class InnerNodeWithNodeGroup extends InnerNode {
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public InnerNodeWithNodeGroup(String name, String location,
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InnerNode parent, int level) {
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super(name, location, parent, level);
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}
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public InnerNodeWithNodeGroup(String name, String location) {
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super(name, location);
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}
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public InnerNodeWithNodeGroup(String path) {
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super(path);
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}
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@Override
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boolean isRack() {
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// it is node group
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if (getChildren().isEmpty()) {
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return false;
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}
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Node firstChild = children.get(0);
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if (firstChild instanceof InnerNode) {
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Node firstGrandChild = (((InnerNode) firstChild).children).get(0);
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if (firstGrandChild instanceof InnerNode) {
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// it is datacenter
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return false;
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} else {
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return true;
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}
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}
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return false;
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}
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/**
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* Judge if this node represents a node group
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*
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* @return true if it has no child or its children are not InnerNodes
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*/
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boolean isNodeGroup() {
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if (children.isEmpty()) {
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return true;
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}
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Node firstChild = children.get(0);
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if (firstChild instanceof InnerNode) {
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// it is rack or datacenter
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return false;
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}
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return true;
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}
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@Override
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protected InnerNode createParentNode(String parentName) {
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return new InnerNodeWithNodeGroup(parentName, getPath(this), this,
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this.getLevel() + 1);
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}
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@Override
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protected boolean areChildrenLeaves() {
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return isNodeGroup();
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}
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}
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}
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@ -599,8 +599,7 @@
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</description>
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</property>
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<!-- Rack Configuration -->
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<!-- Topology Configuration -->
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<property>
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<name>net.topology.node.switch.mapping.impl</name>
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<value>org.apache.hadoop.net.ScriptBasedMapping</value>
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@ -611,6 +610,13 @@
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</description>
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</property>
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<property>
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<name>net.topology.impl</name>
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<value>org.apache.hadoop.net.NetworkTopology</value>
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<description> The default implementation of NetworkTopology which is classic three layer one.
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</description>
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</property>
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<property>
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<name>net.topology.script.file.name</name>
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<value></value>
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@ -0,0 +1,165 @@
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/**
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* Licensed to the Apache Software Foundation (ASF) under one
|
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* or more contributor license agreements. See the NOTICE file
|
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* 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
|
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*
|
||||
* 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.
|
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*/
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package org.apache.hadoop.net;
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import java.util.HashMap;
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import java.util.Map;
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import junit.framework.TestCase;
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import org.apache.hadoop.hdfs.DFSTestUtil;
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import org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor;
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public class TestNetworkTopologyWithNodeGroup extends TestCase {
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private final static NetworkTopologyWithNodeGroup cluster = new
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NetworkTopologyWithNodeGroup();
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private final static DatanodeDescriptor dataNodes[] = new DatanodeDescriptor[] {
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DFSTestUtil.getDatanodeDescriptor("1.1.1.1", "/d1/r1/s1"),
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DFSTestUtil.getDatanodeDescriptor("2.2.2.2", "/d1/r1/s1"),
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DFSTestUtil.getDatanodeDescriptor("3.3.3.3", "/d1/r1/s2"),
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DFSTestUtil.getDatanodeDescriptor("4.4.4.4", "/d1/r2/s3"),
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DFSTestUtil.getDatanodeDescriptor("5.5.5.5", "/d1/r2/s3"),
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DFSTestUtil.getDatanodeDescriptor("6.6.6.6", "/d1/r2/s4"),
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DFSTestUtil.getDatanodeDescriptor("7.7.7.7", "/d2/r3/s5"),
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DFSTestUtil.getDatanodeDescriptor("8.8.8.8", "/d2/r3/s6")
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};
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private final static NodeBase computeNode = new NodeBase("/d1/r1/s1/h9");
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static {
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for(int i=0; i<dataNodes.length; i++) {
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cluster.add(dataNodes[i]);
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}
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}
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public void testNumOfChildren() throws Exception {
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assertEquals(cluster.getNumOfLeaves(), dataNodes.length);
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}
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public void testNumOfRacks() throws Exception {
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assertEquals(cluster.getNumOfRacks(), 3);
|
||||
}
|
||||
|
||||
public void testRacks() throws Exception {
|
||||
assertEquals(cluster.getNumOfRacks(), 3);
|
||||
assertTrue(cluster.isOnSameRack(dataNodes[0], dataNodes[1]));
|
||||
assertTrue(cluster.isOnSameRack(dataNodes[1], dataNodes[2]));
|
||||
assertFalse(cluster.isOnSameRack(dataNodes[2], dataNodes[3]));
|
||||
assertTrue(cluster.isOnSameRack(dataNodes[3], dataNodes[4]));
|
||||
assertTrue(cluster.isOnSameRack(dataNodes[4], dataNodes[5]));
|
||||
assertFalse(cluster.isOnSameRack(dataNodes[5], dataNodes[6]));
|
||||
assertTrue(cluster.isOnSameRack(dataNodes[6], dataNodes[7]));
|
||||
}
|
||||
|
||||
public void testNodeGroups() throws Exception {
|
||||
assertEquals(cluster.getNumOfRacks(), 3);
|
||||
assertTrue(cluster.isOnSameNodeGroup(dataNodes[0], dataNodes[1]));
|
||||
assertFalse(cluster.isOnSameNodeGroup(dataNodes[1], dataNodes[2]));
|
||||
assertFalse(cluster.isOnSameNodeGroup(dataNodes[2], dataNodes[3]));
|
||||
assertTrue(cluster.isOnSameNodeGroup(dataNodes[3], dataNodes[4]));
|
||||
assertFalse(cluster.isOnSameNodeGroup(dataNodes[4], dataNodes[5]));
|
||||
assertFalse(cluster.isOnSameNodeGroup(dataNodes[5], dataNodes[6]));
|
||||
assertFalse(cluster.isOnSameNodeGroup(dataNodes[6], dataNodes[7]));
|
||||
}
|
||||
|
||||
public void testGetDistance() throws Exception {
|
||||
assertEquals(cluster.getDistance(dataNodes[0], dataNodes[0]), 0);
|
||||
assertEquals(cluster.getDistance(dataNodes[0], dataNodes[1]), 2);
|
||||
assertEquals(cluster.getDistance(dataNodes[0], dataNodes[2]), 4);
|
||||
assertEquals(cluster.getDistance(dataNodes[0], dataNodes[3]), 6);
|
||||
assertEquals(cluster.getDistance(dataNodes[0], dataNodes[6]), 8);
|
||||
}
|
||||
|
||||
public void testPseudoSortByDistance() throws Exception {
|
||||
DatanodeDescriptor[] testNodes = new DatanodeDescriptor[4];
|
||||
|
||||
// array contains both local node, local node group & local rack node
|
||||
testNodes[0] = dataNodes[1];
|
||||
testNodes[1] = dataNodes[2];
|
||||
testNodes[2] = dataNodes[3];
|
||||
testNodes[3] = dataNodes[0];
|
||||
cluster.pseudoSortByDistance(dataNodes[0], testNodes );
|
||||
assertTrue(testNodes[0] == dataNodes[0]);
|
||||
assertTrue(testNodes[1] == dataNodes[1]);
|
||||
assertTrue(testNodes[2] == dataNodes[2]);
|
||||
assertTrue(testNodes[3] == dataNodes[3]);
|
||||
|
||||
// array contains local node & local node group
|
||||
testNodes[0] = dataNodes[3];
|
||||
testNodes[1] = dataNodes[4];
|
||||
testNodes[2] = dataNodes[1];
|
||||
testNodes[3] = dataNodes[0];
|
||||
cluster.pseudoSortByDistance(dataNodes[0], testNodes );
|
||||
assertTrue(testNodes[0] == dataNodes[0]);
|
||||
assertTrue(testNodes[1] == dataNodes[1]);
|
||||
|
||||
// array contains local node & rack node
|
||||
testNodes[0] = dataNodes[5];
|
||||
testNodes[1] = dataNodes[3];
|
||||
testNodes[2] = dataNodes[2];
|
||||
testNodes[3] = dataNodes[0];
|
||||
cluster.pseudoSortByDistance(dataNodes[0], testNodes );
|
||||
assertTrue(testNodes[0] == dataNodes[0]);
|
||||
assertTrue(testNodes[1] == dataNodes[2]);
|
||||
|
||||
// array contains local-nodegroup node (not a data node also) & rack node
|
||||
testNodes[0] = dataNodes[6];
|
||||
testNodes[1] = dataNodes[7];
|
||||
testNodes[2] = dataNodes[2];
|
||||
testNodes[3] = dataNodes[0];
|
||||
cluster.pseudoSortByDistance(computeNode, testNodes );
|
||||
assertTrue(testNodes[0] == dataNodes[0]);
|
||||
assertTrue(testNodes[1] == dataNodes[2]);
|
||||
}
|
||||
|
||||
/**
|
||||
* This picks a large number of nodes at random in order to ensure coverage
|
||||
*
|
||||
* @param numNodes the number of nodes
|
||||
* @param excludedScope the excluded scope
|
||||
* @return the frequency that nodes were chosen
|
||||
*/
|
||||
private Map<Node, Integer> pickNodesAtRandom(int numNodes,
|
||||
String excludedScope) {
|
||||
Map<Node, Integer> frequency = new HashMap<Node, Integer>();
|
||||
for (DatanodeDescriptor dnd : dataNodes) {
|
||||
frequency.put(dnd, 0);
|
||||
}
|
||||
|
||||
for (int j = 0; j < numNodes; j++) {
|
||||
Node random = cluster.chooseRandom(excludedScope);
|
||||
frequency.put(random, frequency.get(random) + 1);
|
||||
}
|
||||
return frequency;
|
||||
}
|
||||
|
||||
/**
|
||||
* This test checks that chooseRandom works for an excluded node.
|
||||
*/
|
||||
public void testChooseRandomExcludedNode() {
|
||||
String scope = "~" + NodeBase.getPath(dataNodes[0]);
|
||||
Map<Node, Integer> frequency = pickNodesAtRandom(100, scope);
|
||||
|
||||
for (Node key : dataNodes) {
|
||||
// all nodes except the first should be more than zero
|
||||
assertTrue(frequency.get(key) > 0 || key == dataNodes[0]);
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
Loading…
Reference in New Issue