hadoop SimulatedDataNodes 源码

  • 2022-10-20
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haddop SimulatedDataNodes 代码


 * 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,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package org.apache.hadoop.tools.dynamometer;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URI;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import org.apache.commons.lang3.exception.ExceptionUtils;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.HdfsConfiguration;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.protocol.Block;
import org.apache.hadoop.hdfs.protocol.HdfsConstants;
import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.StartupOption;
import org.apache.hadoop.hdfs.server.datanode.DataNode;
import org.apache.hadoop.hdfs.server.datanode.DataNodeTestUtils;
import org.apache.hadoop.hdfs.server.datanode.SimulatedFSDataset;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.util.Time;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;

 * Starts up a number of DataNodes within the same JVM. These DataNodes all use
 * {@link org.apache.hadoop.hdfs.server.datanode.SimulatedFSDataset}, so they do
 * not store any actual data, and do not persist anything to disk; they maintain
 * all metadata in memory. This is useful for testing and simulation purposes.
 * <p>
 * The DataNodes will attempt to connect to a NameNode defined by the default
 * FileSystem. There will be one DataNode started for each block list file
 * passed as an argument. Each of these files should contain a list of blocks
 * that the corresponding DataNode should contain, as specified by a triplet of
 * block ID, block size, and generation stamp. Each line of the file is one
 * block, in the format:
 * <p>
 * {@code blockID,blockGenStamp,blockSize}
 * <p>
 * This class is loosely based off of
 * {@link org.apache.hadoop.hdfs.DataNodeCluster}.
public class SimulatedDataNodes extends Configured implements Tool {

  // Set this arbitrarily large (100TB) since we don't care about storage
  // capacity
  private static final long STORAGE_CAPACITY = 100 * 2L << 40;
  private static final String USAGE = "Usage: "
      + "org.apache.hadoop.tools.dynamometer.SimulatedDataNodes "
      + "bpid blockListFile1 [ blockListFileN ... ]\n"
      + "   bpid should be the ID of the block pool to which these DataNodes "
      + "belong.\n"
      + "   Each blockListFile specified should contain a list of blocks to "
      + "be served by one DataNode.\n"
      + "   See the Javadoc of this class for more detail.";

  static void printUsageExit(String err) {
    throw new RuntimeException(err);

  public static void main(String[] args) throws Exception {
    SimulatedDataNodes datanodes = new SimulatedDataNodes();
    ToolRunner.run(new HdfsConfiguration(), datanodes, args);

  public int run(String[] args) throws Exception {
    if (args.length < 2) {
      printUsageExit("Not enough arguments");
    String bpid = args[0];
    List<Path> blockListFiles = new ArrayList<>();
    for (int i = 1; i < args.length; i++) {
      blockListFiles.add(new Path(args[i]));

    URI defaultFS = FileSystem.getDefaultUri(getConf());
    if (!HdfsConstants.HDFS_URI_SCHEME.equals(defaultFS.getScheme())) {
          "Must specify an HDFS-based default FS! Got <" + defaultFS + ">");
    String nameNodeAdr = defaultFS.getAuthority();
    if (nameNodeAdr == null) {
      printUsageExit("No NameNode address and port in config");
    System.out.println("DataNodes will connect to NameNode at " + nameNodeAdr);

    String loc = DataNode.getStorageLocations(getConf()).get(0).toString();
    loc = loc.substring(loc.indexOf("]") + 1); // delete storage type
    String path = new URI(loc).getPath();
    System.setProperty(MiniDFSCluster.PROP_TEST_BUILD_DATA, path);

    MiniDFSCluster mc = new MiniDFSCluster();
    try {
    } catch (IOException e) {
      System.out.println("Error formatting DataNode dirs: " + e);
      throw new RuntimeException("Error formatting DataNode dirs", e);

    try {
      System.out.println("Found " + blockListFiles.size()
          + " block listing files; launching DataNodes accordingly.");
      mc.startDataNodes(getConf(), blockListFiles.size(), null, false,
          StartupOption.REGULAR, null, null, null, null, false, true, true,
          null, null, null);
      long startTime = Time.monotonicNow();
      System.out.println("Waiting for DataNodes to connect to NameNode and "
          + "init storage directories.");
      Set<DataNode> datanodesWithoutFSDataset = new HashSet<>(
      while (!datanodesWithoutFSDataset.isEmpty()) {
            .removeIf((dn) -> DataNodeTestUtils.getFSDataset(dn) != null);
      System.out.println("Waited " + (Time.monotonicNow() - startTime)
          + " ms for DataNode FSDatasets to be ready");

      for (int dnIndex = 0; dnIndex < blockListFiles.size(); dnIndex++) {
        Path blockListFile = blockListFiles.get(dnIndex);
        try (FSDataInputStream fsdis =
            BufferedReader reader = new BufferedReader(
                new InputStreamReader(fsdis, StandardCharsets.UTF_8))) {
          List<Block> blockList = new ArrayList<>();
          int cnt = 0;
          for (String line = reader.readLine(); line != null; line = reader
              .readLine()) {
            // Format of the listing files is blockID,blockGenStamp,blockSize
            String[] blockInfo = line.split(",");
            blockList.add(new Block(Long.parseLong(blockInfo[0]),
                Long.parseLong(blockInfo[2]), Long.parseLong(blockInfo[1])));
          try {
            mc.injectBlocks(dnIndex, blockList, bpid);
          } catch (IOException ioe) {
            System.out.printf("Error injecting blocks into DataNode %d for "
                    + "block pool %s: %s%n", dnIndex, bpid,
              "Injected %d blocks into DataNode %d for block pool %s%n",
              cnt, dnIndex, bpid);

    } catch (IOException e) {
          "Error creating DataNodes: " + ExceptionUtils.getStackTrace(e));
      return 1;
    return 0;



hadoop 源码目录


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hadoop BlockPlacementPolicyAlwaysSatisfied 源码

hadoop Client 源码

hadoop DynoConstants 源码

hadoop DynoInfraUtils 源码

hadoop DynoResource 源码

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