| /** |
| * 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.hdfs; |
| |
| import java.util.List; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| |
| import org.apache.hadoop.util.Preconditions; |
| import org.apache.hadoop.util.Lists; |
| |
| /** |
| * This class is used to specify the setup of namenodes when instantiating |
| * a MiniDFSCluster. It consists of a set of nameservices, each of which |
| * may have one or more namenodes (in the case of HA) |
| */ |
| @InterfaceAudience.LimitedPrivate({"HBase", "HDFS", "Hive", "MapReduce", "Pig"}) |
| @InterfaceStability.Unstable |
| public class MiniDFSNNTopology { |
| private final List<NSConf> nameservices = Lists.newArrayList(); |
| private boolean federation; |
| |
| public MiniDFSNNTopology() { |
| } |
| |
| /** |
| * Set up a simple non-federated non-HA NN. |
| */ |
| public static MiniDFSNNTopology simpleSingleNN( |
| int nameNodePort, int nameNodeHttpPort) { |
| return new MiniDFSNNTopology() |
| .addNameservice(new MiniDFSNNTopology.NSConf(null) |
| .addNN(new MiniDFSNNTopology.NNConf(null) |
| .setHttpPort(nameNodeHttpPort) |
| .setIpcPort(nameNodePort))); |
| } |
| |
| |
| /** |
| * Set up an HA topology with a single HA nameservice. |
| */ |
| public static MiniDFSNNTopology simpleHATopology() { |
| return simpleHATopology(2); |
| } |
| |
| /** |
| * Set up an HA topology with a single HA nameservice. |
| * @param nnCount of namenodes to use with the nameservice |
| */ |
| public static MiniDFSNNTopology simpleHATopology(int nnCount) { |
| MiniDFSNNTopology.NSConf nameservice = new MiniDFSNNTopology.NSConf("minidfs-ns"); |
| for (int i = 1; i <= nnCount; i++) { |
| nameservice.addNN(new MiniDFSNNTopology.NNConf("nn" + i)); |
| } |
| MiniDFSNNTopology topology = new MiniDFSNNTopology().addNameservice(nameservice); |
| return topology; |
| } |
| |
| /** |
| * Set up an HA topology with a single HA nameservice. |
| * @param nnCount of namenodes to use with the nameservice |
| * @param basePort for IPC and Http ports of namenodes. |
| */ |
| public static MiniDFSNNTopology simpleHATopology(int nnCount, int basePort) { |
| MiniDFSNNTopology.NSConf ns = new MiniDFSNNTopology.NSConf("minidfs-ns"); |
| for (int i = 0; i < nnCount; i++) { |
| ns.addNN(new MiniDFSNNTopology.NNConf("nn" + i) |
| .setIpcPort(basePort++) |
| .setHttpPort(basePort++)); |
| } |
| MiniDFSNNTopology topology = new MiniDFSNNTopology() |
| .addNameservice(ns); |
| return topology; |
| } |
| |
| /** |
| * Set up federated cluster with the given number of nameservices, each |
| * of which has only a single NameNode. |
| */ |
| public static MiniDFSNNTopology simpleFederatedTopology( |
| int numNameservices) { |
| MiniDFSNNTopology topology = new MiniDFSNNTopology(); |
| for (int i = 1; i <= numNameservices; i++) { |
| topology.addNameservice(new MiniDFSNNTopology.NSConf("ns" + i) |
| .addNN(new MiniDFSNNTopology.NNConf(null))); |
| } |
| topology.setFederation(true); |
| return topology; |
| } |
| |
| /** |
| * Set up federated cluster with the given nameservices, each |
| * of which has only a single NameNode. |
| */ |
| public static MiniDFSNNTopology simpleFederatedTopology(String nameservicesIds) { |
| MiniDFSNNTopology topology = new MiniDFSNNTopology(); |
| String nsIds[] = nameservicesIds.split(","); |
| for (String nsId : nsIds) { |
| topology.addNameservice(new MiniDFSNNTopology.NSConf(nsId) |
| .addNN(new MiniDFSNNTopology.NNConf(null))); |
| } |
| topology.setFederation(true); |
| return topology; |
| } |
| |
| /** |
| * Set up federated cluster with the given number of nameservices, each |
| * of which has two NameNodes. |
| */ |
| public static MiniDFSNNTopology simpleHAFederatedTopology( |
| int numNameservices) { |
| MiniDFSNNTopology topology = new MiniDFSNNTopology(); |
| for (int i = 0; i < numNameservices; i++) { |
| topology.addNameservice(new MiniDFSNNTopology.NSConf("ns" + i) |
| .addNN(new MiniDFSNNTopology.NNConf("nn0")) |
| .addNN(new MiniDFSNNTopology.NNConf("nn1"))); |
| } |
| topology.setFederation(true); |
| return topology; |
| } |
| |
| public MiniDFSNNTopology setFederation(boolean federation) { |
| this.federation = federation; |
| return this; |
| } |
| |
| public MiniDFSNNTopology addNameservice(NSConf nameservice) { |
| Preconditions.checkArgument(!nameservice.getNNs().isEmpty(), |
| "Must have at least one NN in a nameservice"); |
| this.nameservices.add(nameservice); |
| return this; |
| } |
| |
| public int countNameNodes() { |
| int count = 0; |
| for (NSConf ns : nameservices) { |
| count += ns.nns.size(); |
| } |
| return count; |
| } |
| |
| public NNConf getOnlyNameNode() { |
| Preconditions.checkState(countNameNodes() == 1, |
| "must have exactly one NN!"); |
| return nameservices.get(0).getNNs().get(0); |
| } |
| |
| public boolean isFederated() { |
| return nameservices.size() > 1 || federation; |
| } |
| |
| /** |
| * @return true if at least one of the nameservices |
| * in the topology has HA enabled. |
| */ |
| public boolean isHA() { |
| for (NSConf ns : nameservices) { |
| if (ns.getNNs().size() > 1) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| /** |
| * @return true if all of the NNs in the cluster have their HTTP |
| * port specified to be non-ephemeral. |
| */ |
| public boolean allHttpPortsSpecified() { |
| for (NSConf ns : nameservices) { |
| for (NNConf nn : ns.getNNs()) { |
| if (nn.getHttpPort() == 0) { |
| return false; |
| } |
| } |
| } |
| return true; |
| } |
| |
| /** |
| * @return true if all of the NNs in the cluster have their IPC |
| * port specified to be non-ephemeral. |
| */ |
| public boolean allIpcPortsSpecified() { |
| for (NSConf ns : nameservices) { |
| for (NNConf nn : ns.getNNs()) { |
| if (nn.getIpcPort() == 0) { |
| return false; |
| } |
| } |
| } |
| return true; |
| } |
| |
| public List<NSConf> getNameservices() { |
| return nameservices; |
| } |
| |
| public static class NSConf { |
| private final String id; |
| private final List<NNConf> nns = Lists.newArrayList(); |
| |
| public NSConf(String id) { |
| this.id = id; |
| } |
| |
| public NSConf addNN(NNConf nn) { |
| this.nns.add(nn); |
| return this; |
| } |
| |
| public String getId() { |
| return id; |
| } |
| |
| public List<NNConf> getNNs() { |
| return nns; |
| } |
| } |
| |
| public static class NNConf { |
| private final String nnId; |
| private int httpPort; |
| private int ipcPort; |
| private String clusterId; |
| |
| public NNConf(String nnId) { |
| this.nnId = nnId; |
| } |
| |
| public String getNnId() { |
| return nnId; |
| } |
| |
| int getIpcPort() { |
| return ipcPort; |
| } |
| |
| int getHttpPort() { |
| return httpPort; |
| } |
| |
| String getClusterId() { |
| return clusterId; |
| } |
| |
| public NNConf setHttpPort(int httpPort) { |
| this.httpPort = httpPort; |
| return this; |
| } |
| |
| public NNConf setIpcPort(int ipcPort) { |
| this.ipcPort = ipcPort; |
| return this; |
| } |
| |
| public NNConf setClusterId(String clusterId) { |
| this.clusterId = clusterId; |
| return this; |
| } |
| } |
| |
| } |