Create AbusiveUserMapper to replicate an abusive user's workload

dynamometer-workload/src/main/java/com/linkedin/dynamometer/workloadgenerator/AbusiveUserMapper.java

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+/**
+ * Copyright 2019 LinkedIn Corporation. All rights reserved. Licensed under the BSD-2 Clause license.
+ * See LICENSE in the project root for license information.
+ */
+package com.linkedin.dynamometer.workloadgenerator;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.hdfs.DistributedFileSystem;
+import org.apache.hadoop.io.LongWritable;
+import org.apache.hadoop.io.NullWritable;
+import org.apache.hadoop.security.UserGroupInformation;
+
+import java.io.IOException;
+import java.net.URI;
+import java.security.PrivilegedAction;
+import java.util.List;
+import java.util.concurrent.ConcurrentHashMap;
+
+
+/**
+ * AbusiveUserMapper consists of two types of users: one type that performs a large listing operation on a directory
+ * with many files, and another type that performs a small operation (either a single file listing or a single directory
+ * creation). This uses {@link TimedInputFormat}; see its Javadoc for configuration information. Only requires the
+ * NameNode, does not make file data changes.
+ *
+ * <p>Configuration options available:
+ * <ul>
+ *   <li>{@value FILE_PARENT_PATH_KEY} (default: {@value FILE_PARENT_PATH_DEFAULT}): The root directory for the job to
+ *   create files in.</li>
+ *   <li>{@value NUM_LARGE_JOBS_KEY} (default: {@value NUM_LARGE_JOBS_DEFAULT}): The number of large listing jobs.
+ *   Mappers numbered 0 through this value will run the abusive operation.</li>
+ *   <li>{@value NUM_FILES_KEY} (default: {@value NUM_FILES_DEFAULT}): Number of files in the directory for the large
+ *   listing operations.</li>
+ *   <li>{@value MAPPERS_PER_USER_KEY} (default: {@value MAPPERS_PER_USER_DEFAULT}): Number of mappers to assign to each
+ *   user. Make a single large/abusive user by setting this and {@value NUM_LARGE_JOBS_KEY} equal.
+ *   <li>{@value ENABLE_WRITE_OPS_KEY} (default: {@value ENABLE_WRITE_OPS_DEFAULT}): Enabling this sets the small
+ *   operation to create a single directory, instead of listing a single file directory.
+ * </ul>
+ */
+public class AbusiveUserMapper extends WorkloadMapper<LongWritable, NullWritable, NullWritable, NullWritable> {
+
+  public static final String FILE_PARENT_PATH_KEY = "bigfile.file-parent-path";
+  public static final String FILE_PARENT_PATH_DEFAULT = "/tmp/createFileMapper";
+
+  public static final String NUM_LARGE_JOBS_KEY = "bigfile.num-large-jobs";
+  public static final int NUM_LARGE_JOBS_DEFAULT = 10;
+
+  public static final String NUM_FILES_KEY = "bigfile.num-files";
+  public static final int NUM_FILES_DEFAULT = 1000;
+
+  public static final String MAPPERS_PER_USER_KEY = "bigfile.mappers-per-user";
+  public static final int MAPPERS_PER_USER_DEFAULT = 10;
+
+  public static final String ENABLE_WRITE_OPS_KEY = "bigfile.enable-write-ops";
+  public static final boolean ENABLE_WRITE_OPS_DEFAULT = false;
+
+  private ConcurrentHashMap<String, FileSystem> fsMap = new ConcurrentHashMap<String, FileSystem>();
+  private Path parentFolder;
+  private int numLargeJobs;
+  private int mappersPerUser;
+  private boolean enableWriteOps;
+
+  @Override
+  public String getDescription() {
+    return "This mapper creates 1-byte files for the specified duration.";
+  }
+
+  @Override
+  public List<String> getConfigDescriptions() {
+    List<String> baseList = TimedInputFormat.getConfigDescriptions();
+    baseList.add(FILE_PARENT_PATH_KEY + " (default: " + FILE_PARENT_PATH_DEFAULT +
+        "): The root directory for the job to create files in.");
+    baseList.add(NUM_LARGE_JOBS_KEY + " (default: " + NUM_LARGE_JOBS_DEFAULT +
+        "): Number of large listing jobs.");
+    baseList.add(NUM_FILES_KEY + " (default: " + NUM_FILES_DEFAULT +
+        "): Number of files in the directory for the large listing operations.");
+    baseList.add(MAPPERS_PER_USER_KEY + " (default: " + MAPPERS_PER_USER_DEFAULT +
+        "): Number of mappers per user.");
+    baseList.add(ENABLE_WRITE_OPS_KEY + " (default: " + ENABLE_WRITE_OPS_DEFAULT +
+        "): For the small operation, creates a single directory instead of listing a single file directory.");
+    return baseList;
+  }
+
+  @Override
+  public boolean verifyConfigurations(Configuration conf) {
+    return TimedInputFormat.verifyConfigurations(conf);
+  }
+
+  @Override
+  public void setup(Context context) throws IOException {
+    // Load config
+    Configuration conf = context.getConfiguration();
+    int taskID = context.getTaskAttemptID().getTaskID().getId();
+    numLargeJobs = conf.getInt(NUM_LARGE_JOBS_KEY, NUM_LARGE_JOBS_DEFAULT);
+    int numFiles = conf.getInt(NUM_FILES_KEY, NUM_FILES_DEFAULT);
+    mappersPerUser = conf.getInt(MAPPERS_PER_USER_KEY, MAPPERS_PER_USER_DEFAULT);
+    enableWriteOps = conf.getBoolean(ENABLE_WRITE_OPS_KEY, ENABLE_WRITE_OPS_DEFAULT);
+
+    // Load filesystem
+    String namenodeURI = conf.get(WorkloadDriver.NN_URI);
+    UserGroupInformation loginUser = UserGroupInformation.getLoginUser();
+    String proxyUser = "fakeuser" + taskID / mappersPerUser;
+    UserGroupInformation ugi = UserGroupInformation.createProxyUser(proxyUser, loginUser);
+    FileSystem fs = ugi.doAs(new PrivilegedAction<FileSystem>() {
+      @Override
+      public FileSystem run() {
+        try {
+          FileSystem fs = new DistributedFileSystem();
+          fs.initialize(URI.create(namenodeURI), conf);
+          return fs;
+        } catch (IOException ioe) {
+          throw new RuntimeException(ioe);
+        }
+      }
+    });
+    fsMap.put(proxyUser, fs);
+
+    // Load default path
+    String fileParentPath = conf.get(FILE_PARENT_PATH_KEY, FILE_PARENT_PATH_DEFAULT);
+    parentFolder = new Path(new Path(fileParentPath), "mapper" + taskID);
+
+    // Make job folder
+    fs.mkdirs(parentFolder);
+
+    if (taskID < numLargeJobs) {
+      // Large job: set up files for large listing op
+      for (int i = 0; i < numFiles; i++) {
+        fs.mkdirs(new Path(parentFolder, new Path("big" + i)));
+      }
+    } else if (enableWriteOps) {
+      // Small write job: no setup required
+    } else {
+      // Small read job: set up file for single-file listing op
+      fs.mkdirs(new Path(parentFolder, new Path("small" + taskID)));
+    }
+  }
+
+  @Override
+  public void map(LongWritable key, NullWritable value, Context mapperContext)
+      throws IOException {
+    int taskID = mapperContext.getTaskAttemptID().getTaskID().getId();
+    String proxyUser = "fakeuser" + taskID / mappersPerUser;
+    FileSystem fs = fsMap.get(proxyUser);
+
+    if (taskID < numLargeJobs) {
+      // Large job: lists
+      fs.listStatus(parentFolder);
+    } else if (enableWriteOps) {
+      // Small mkdir op
+      fs.mkdirs(new Path(parentFolder, new Path("small" + taskID)));
+      fs.delete(new Path(parentFolder, new Path("small" + taskID)), true);
+    } else {
+      // Small listing op
+      fs.listStatus(new Path(parentFolder, new Path("small" + taskID)));
+    }
+  }
+}