Java Configuration.setFloat方法代碼示例

import org.apache.hadoop.conf.Configuration; //導入方法依賴的package包/類
public static void main(String[] args) throws Exception {

        Configuration conf = new Configuration();
        conf.setFloat("beta", Float.parseFloat(args[3]));
        Job job = Job.getInstance(conf);
        job.setJarByClass(UnitSum.class);

        ChainMapper.addMapper(job, PassMapper.class, Object.class, Text.class, Text.class, DoubleWritable.class, conf);
        ChainMapper.addMapper(job, BetaMapper.class, Text.class, DoubleWritable.class, Text.class, DoubleWritable.class, conf);

        job.setReducerClass(SumReducer.class);
        job.setOutputKeyClass(Text.class);
        job.setOutputValueClass(DoubleWritable.class);

        MultipleInputs.addInputPath(job, new Path(args[0]), TextInputFormat.class, PassMapper.class);
        MultipleInputs.addInputPath(job, new Path(args[1]), TextInputFormat.class, BetaMapper.class);

        FileOutputFormat.setOutputPath(job, new Path(args[2]));
        job.waitForCompletion(true);
    }
 

import org.apache.hadoop.conf.Configuration; //導入方法依賴的package包/類
@BeforeClass
public static void beforeClass() throws Exception {
  Configuration conf = HTU.getConfiguration();
  conf.setFloat("hbase.regionserver.logroll.multiplier", 0.0003f);
  conf.setInt("replication.source.size.capacity", 10240);
  conf.setLong("replication.source.sleepforretries", 100);
  conf.setInt("hbase.regionserver.maxlogs", 10);
  conf.setLong("hbase.master.logcleaner.ttl", 10);
  conf.setInt("zookeeper.recovery.retry", 1);
  conf.setInt("zookeeper.recovery.retry.intervalmill", 10);
  conf.setBoolean(HConstants.REPLICATION_ENABLE_KEY, true);
  conf.setBoolean(ServerRegionReplicaUtil.REGION_REPLICA_REPLICATION_CONF_KEY, true);
  conf.setLong(HConstants.THREAD_WAKE_FREQUENCY, 100);
  conf.setInt("replication.stats.thread.period.seconds", 5);
  conf.setBoolean("hbase.tests.use.shortcircuit.reads", false);
  conf.setInt(HConstants.HBASE_CLIENT_RETRIES_NUMBER, 5); // less number of retries is needed
  conf.setInt("hbase.client.serverside.retries.multiplier", 1);

  HTU.startMiniCluster(NB_SERVERS);
}
 

import org.apache.hadoop.conf.Configuration; //導入方法依賴的package包/類
public static void main(String[] args) throws Exception {

        Configuration conf = new Configuration();
        conf.setFloat("beta", Float.parseFloat(args[3]));
        Job job = Job.getInstance(conf);
        job.setJarByClass(UnitMultiplication.class);

        ChainMapper.addMapper(job, TransitionMapper.class, Object.class, Text.class, Text.class, Text.class, conf);
        ChainMapper.addMapper(job, PRMapper.class, Object.class, Text.class, Text.class, Text.class, conf);

        job.setReducerClass(MultiplicationReducer.class);

        job.setOutputKeyClass(Text.class);
        job.setOutputValueClass(Text.class);

        MultipleInputs.addInputPath(job, new Path(args[0]), TextInputFormat.class, TransitionMapper.class);
        MultipleInputs.addInputPath(job, new Path(args[1]), TextInputFormat.class, PRMapper.class);

        FileOutputFormat.setOutputPath(job, new Path(args[2]));
        job.waitForCompletion(true);
    }
 

import org.apache.hadoop.conf.Configuration; //導入方法依賴的package包/類
public Configuration createConfiguration() {
  Configuration conf = new YarnConfiguration();
  conf.setClass(YarnConfiguration.RM_SCHEDULER, FairScheduler.class,
      ResourceScheduler.class);
  conf.setInt(YarnConfiguration.RM_SCHEDULER_MINIMUM_ALLOCATION_MB, 0);
  conf.setInt(FairSchedulerConfiguration.RM_SCHEDULER_INCREMENT_ALLOCATION_MB,
      1024);
  conf.setInt(YarnConfiguration.RM_SCHEDULER_MAXIMUM_ALLOCATION_MB, 10240);
  conf.setBoolean(FairSchedulerConfiguration.ASSIGN_MULTIPLE, false);
  conf.setFloat(FairSchedulerConfiguration.PREEMPTION_THRESHOLD, 0f);
  return conf;
}
 

import org.apache.hadoop.conf.Configuration; //導入方法依賴的package包/類
@Test
public void testSplitOffStripe() throws Exception {
  Configuration conf = HBaseConfiguration.create();
  // First test everything with default split count of 2, then split into more.
  conf.setInt(StripeStoreConfig.MIN_FILES_KEY, 2);
  Long[] toSplit = new Long[] { defaultSplitSize - 2, 1L, 1L };
  Long[] noSplit = new Long[] { defaultSplitSize - 2, 1L };
  long splitTargetSize = (long)(defaultSplitSize / defaultSplitCount);
  // Don't split if not eligible for compaction.
  StripeCompactionPolicy.StripeInformationProvider si =
      createStripesWithSizes(0, 0, new Long[] { defaultSplitSize - 2, 2L });
  assertNull(createPolicy(conf).selectCompaction(si, al(), false));
  // Make sure everything is eligible.
  conf.setFloat(CompactionConfiguration.HBASE_HSTORE_COMPACTION_RATIO_KEY, 500f);
  StripeCompactionPolicy policy = createPolicy(conf);
  verifyWholeStripesCompaction(policy, si, 0, 0, null, 2, splitTargetSize);
  // Add some extra stripes...
  si = createStripesWithSizes(0, 0, noSplit, noSplit, toSplit);
  verifyWholeStripesCompaction(policy, si, 2, 2, null, 2, splitTargetSize);
  // In the middle.
  si = createStripesWithSizes(0, 0, noSplit, toSplit, noSplit);
  verifyWholeStripesCompaction(policy, si, 1, 1, null, 2, splitTargetSize);
  // No split-off with different config (larger split size).
  // However, in this case some eligible stripe will just be compacted alone.
  StripeCompactionPolicy specPolicy = createPolicy(
      conf, defaultSplitSize + 1, defaultSplitCount, defaultInitialCount, false);
  verifySingleStripeCompaction(specPolicy, si, 1, null);
}
 

import org.apache.hadoop.conf.Configuration; //導入方法依賴的package包/類
@Test
public void testAutoTunerShouldBeOffWhenMaxMinRangesForMemstoreIsNotGiven() throws Exception {
  Configuration conf = HBaseConfiguration.create();
  conf.setFloat(HeapMemorySizeUtil.MEMSTORE_SIZE_KEY, 0.02f);
  conf.setFloat(HeapMemoryManager.BLOCK_CACHE_SIZE_MAX_RANGE_KEY, 0.75f);
  conf.setFloat(HeapMemoryManager.BLOCK_CACHE_SIZE_MIN_RANGE_KEY, 0.03f);
  HeapMemoryManager manager = new HeapMemoryManager(new BlockCacheStub(0),
      new MemstoreFlusherStub(0), new RegionServerStub(conf), new RegionServerAccountingStub());
  assertFalse(manager.isTunerOn());
}
 

import org.apache.hadoop.conf.Configuration; //導入方法依賴的package包/類
private static void initPolicy(VolumeChoosingPolicy<FsVolumeSpi> policy,
    float preferencePercent) {
  Configuration conf = new Configuration();
  // Set the threshold to consider volumes imbalanced to 1MB
  conf.setLong(
      DFS_DATANODE_AVAILABLE_SPACE_VOLUME_CHOOSING_POLICY_BALANCED_SPACE_THRESHOLD_KEY,
      1024 * 1024); // 1MB
  conf.setFloat(
      DFS_DATANODE_AVAILABLE_SPACE_VOLUME_CHOOSING_POLICY_BALANCED_SPACE_PREFERENCE_FRACTION_KEY,
      preferencePercent);
  ((Configurable) policy).setConf(conf);
}
 

import org.apache.hadoop.conf.Configuration; //導入方法依賴的package包/類
@Test
public void testWhenClusterIsWriteHeavyWithEmptyMemstore() throws Exception {
  BlockCacheStub blockCache = new BlockCacheStub((long) (maxHeapSize * 0.4));
  MemstoreFlusherStub memStoreFlusher = new MemstoreFlusherStub((long) (maxHeapSize * 0.4));
  RegionServerAccountingStub regionServerAccounting = new RegionServerAccountingStub();
  // Empty block cache and memstore
  blockCache.setTestBlockSize(0);
  regionServerAccounting.setTestMemstoreSize(0);
  Configuration conf = HBaseConfiguration.create();
  conf.setFloat(HeapMemoryManager.MEMSTORE_SIZE_MAX_RANGE_KEY, 0.75f);
  conf.setFloat(HeapMemoryManager.MEMSTORE_SIZE_MIN_RANGE_KEY, 0.10f);
  conf.setFloat(HeapMemoryManager.BLOCK_CACHE_SIZE_MAX_RANGE_KEY, 0.7f);
  conf.setFloat(HeapMemoryManager.BLOCK_CACHE_SIZE_MIN_RANGE_KEY, 0.05f);
  conf.setLong(HeapMemoryManager.HBASE_RS_HEAP_MEMORY_TUNER_PERIOD, 1000);
  conf.setInt(DefaultHeapMemoryTuner.NUM_PERIODS_TO_IGNORE, 0);
  // Let the system start with default values for memstore heap and block cache size.
  HeapMemoryManager heapMemoryManager = new HeapMemoryManager(blockCache, memStoreFlusher,
      new RegionServerStub(conf), regionServerAccounting);
  long oldMemstoreHeapSize = memStoreFlusher.memstoreSize;
  long oldBlockCacheSize = blockCache.maxSize;
  final ChoreService choreService = new ChoreService("TEST_SERVER_NAME");
  heapMemoryManager.start(choreService);
  memStoreFlusher.flushType = FlushType.ABOVE_HIGHER_MARK;
  memStoreFlusher.requestFlush(null, false);
  memStoreFlusher.requestFlush(null, false);
  memStoreFlusher.requestFlush(null, false);
  memStoreFlusher.flushType = FlushType.ABOVE_LOWER_MARK;
  memStoreFlusher.requestFlush(null, false);
  // Allow the tuner to run once and do necessary memory up
  Thread.sleep(1500);
  // No changes should be made by tuner as we already have lot of empty space
  assertEquals(oldMemstoreHeapSize, memStoreFlusher.memstoreSize);
  assertEquals(oldBlockCacheSize, blockCache.maxSize);
}
 

import org.apache.hadoop.conf.Configuration; //導入方法依賴的package包/類
@Test
public void testSplitOffStripeOffPeak() throws Exception {
  // for HBASE-11439
  Configuration conf = HBaseConfiguration.create();
  conf.setInt(StripeStoreConfig.MIN_FILES_KEY, 2);
  // Select the last 2 files.
  StripeCompactionPolicy.StripeInformationProvider si =
      createStripesWithSizes(0, 0, new Long[] { defaultSplitSize - 2, 1L, 1L });
  assertEquals(2, createPolicy(conf).selectCompaction(si, al(), false).getRequest().getFiles()
      .size());
  // Make sure everything is eligible in offpeak.
  conf.setFloat("hbase.hstore.compaction.ratio.offpeak", 500f);
  assertEquals(3, createPolicy(conf).selectCompaction(si, al(), true).getRequest().getFiles()
      .size());
}
 

import org.apache.hadoop.conf.Configuration; //導入方法依賴的package包/類
private void initialize() throws Exception {
  if (hbAdmin == null) {
    // make a copy, just to be sure we're not overriding someone else's config
    setConf(HBaseConfiguration.create(getConf()));
    Configuration conf = getConf();
    // disable blockcache for tool invocation, see HBASE-10500
    conf.setFloat(HConstants.HFILE_BLOCK_CACHE_SIZE_KEY, 0);
    this.hbAdmin = new HBaseAdmin(conf);
    this.userProvider = UserProvider.instantiate(conf);
    this.fsDelegationToken = new FsDelegationToken(userProvider, "renewer");
    assignSeqIds = conf.getBoolean(ASSIGN_SEQ_IDS, true);
    maxFilesPerRegionPerFamily = conf.getInt(MAX_FILES_PER_REGION_PER_FAMILY, 32);
  }
}
 

import org.apache.hadoop.conf.Configuration; //導入方法依賴的package包/類
@Test
public void testWhenClusterIsReadHeavyWithEmptyBlockCache() throws Exception {
  BlockCacheStub blockCache = new BlockCacheStub((long) (maxHeapSize * 0.4));
  MemstoreFlusherStub memStoreFlusher = new MemstoreFlusherStub((long) (maxHeapSize * 0.4));
  RegionServerAccountingStub regionServerAccounting = new RegionServerAccountingStub();
  // Empty block cache and memstore
  blockCache.setTestBlockSize(0);
  regionServerAccounting.setTestMemstoreSize(0);
  Configuration conf = HBaseConfiguration.create();
  conf.setFloat(HeapMemoryManager.MEMSTORE_SIZE_MAX_RANGE_KEY, 0.75f);
  conf.setFloat(HeapMemoryManager.MEMSTORE_SIZE_MIN_RANGE_KEY, 0.10f);
  conf.setFloat(HeapMemoryManager.BLOCK_CACHE_SIZE_MAX_RANGE_KEY, 0.7f);
  conf.setFloat(HeapMemoryManager.BLOCK_CACHE_SIZE_MIN_RANGE_KEY, 0.05f);
  conf.setLong(HeapMemoryManager.HBASE_RS_HEAP_MEMORY_TUNER_PERIOD, 1000);
  conf.setInt(DefaultHeapMemoryTuner.NUM_PERIODS_TO_IGNORE, 0);
  // Let the system start with default values for memstore heap and block cache size.
  HeapMemoryManager heapMemoryManager = new HeapMemoryManager(blockCache, memStoreFlusher,
      new RegionServerStub(conf), regionServerAccounting);
  long oldMemstoreHeapSize = memStoreFlusher.memstoreSize;
  long oldBlockCacheSize = blockCache.maxSize;
  final ChoreService choreService = new ChoreService("TEST_SERVER_NAME");
  heapMemoryManager.start(choreService);
  blockCache.evictBlock(null);
  blockCache.evictBlock(null);
  blockCache.evictBlock(null);
  // Allow the tuner to run once and do necessary memory up
  Thread.sleep(1500);
  // No changes should be made by tuner as we already have lot of empty space
  assertEquals(oldMemstoreHeapSize, memStoreFlusher.memstoreSize);
  assertEquals(oldBlockCacheSize, blockCache.maxSize);
}
 

import org.apache.hadoop.conf.Configuration; //導入方法依賴的package包/類
@Test
public void testPluggingInHeapMemoryTuner() throws Exception {
  BlockCacheStub blockCache = new BlockCacheStub((long) (maxHeapSize * 0.4));
  MemstoreFlusherStub memStoreFlusher = new MemstoreFlusherStub((long) (maxHeapSize * 0.4));
  Configuration conf = HBaseConfiguration.create();
  conf.setFloat(HeapMemoryManager.MEMSTORE_SIZE_MAX_RANGE_KEY, 0.78f);
  conf.setFloat(HeapMemoryManager.MEMSTORE_SIZE_MIN_RANGE_KEY, 0.05f);
  conf.setFloat(HeapMemoryManager.BLOCK_CACHE_SIZE_MAX_RANGE_KEY, 0.75f);
  conf.setFloat(HeapMemoryManager.BLOCK_CACHE_SIZE_MIN_RANGE_KEY, 0.02f);
  conf.setLong(HeapMemoryManager.HBASE_RS_HEAP_MEMORY_TUNER_PERIOD, 1000);
  conf.setInt(DefaultHeapMemoryTuner.NUM_PERIODS_TO_IGNORE, 0);
  conf.setClass(HeapMemoryManager.HBASE_RS_HEAP_MEMORY_TUNER_CLASS, CustomHeapMemoryTuner.class,
      HeapMemoryTuner.class);
  // Let the system start with default values for memstore heap and block cache size.
  HeapMemoryManager heapMemoryManager = new HeapMemoryManager(blockCache, memStoreFlusher,
      new RegionServerStub(conf), new RegionServerAccountingStub());
  final ChoreService choreService = new ChoreService("TEST_SERVER_NAME");
  heapMemoryManager.start(choreService);
  // Now we wants to be in write mode. Set bigger memstore size from CustomHeapMemoryTuner
  CustomHeapMemoryTuner.memstoreSize = 0.78f;
  CustomHeapMemoryTuner.blockCacheSize = 0.02f;
  // Allow the tuner to run once and do necessary memory up
  waitForTune(memStoreFlusher, memStoreFlusher.memstoreSize);
  assertHeapSpace(0.78f, memStoreFlusher.memstoreSize);// Memstore
  assertHeapSpace(0.02f, blockCache.maxSize);// BlockCache
  // Now we wants to be in read mode. Set bigger memstore size from CustomHeapMemoryTuner
  CustomHeapMemoryTuner.blockCacheSize = 0.75f;
  CustomHeapMemoryTuner.memstoreSize = 0.05f;
  // Allow the tuner to run once and do necessary memory up
  waitForTune(memStoreFlusher, memStoreFlusher.memstoreSize);
  assertHeapSpace(0.75f, blockCache.maxSize);// BlockCache
  assertHeapSpace(0.05f, memStoreFlusher.memstoreSize);// Memstore
}
 

import org.apache.hadoop.conf.Configuration; //導入方法依賴的package包/類
@Test
public void testGetFullDirs() throws Exception {
  Configuration conf = new YarnConfiguration();

  conf.set(CommonConfigurationKeys.FS_PERMISSIONS_UMASK_KEY, "077");
  FileContext localFs = FileContext.getLocalFSFileContext(conf);

  String localDir1 = new File(testDir, "localDir1").getPath();
  String localDir2 = new File(testDir, "localDir2").getPath();
  String logDir1 = new File(testDir, "logDir1").getPath();
  String logDir2 = new File(testDir, "logDir2").getPath();
  Path localDir1Path = new Path(localDir1);
  Path logDir1Path = new Path(logDir1);
  FsPermission dirPermissions = new FsPermission((short) 0410);
  localFs.mkdir(localDir1Path, dirPermissions, true);
  localFs.mkdir(logDir1Path, dirPermissions, true);

  conf.set(YarnConfiguration.NM_LOCAL_DIRS, localDir1 + "," + localDir2);
  conf.set(YarnConfiguration.NM_LOG_DIRS, logDir1 + "," + logDir2);
  conf.setFloat(YarnConfiguration.NM_MAX_PER_DISK_UTILIZATION_PERCENTAGE,
    0.0f);
  NodeManagerMetrics nm = NodeManagerMetrics.create();
  LocalDirsHandlerService dirSvc = new LocalDirsHandlerService(nm);
  dirSvc.init(conf);
  Assert.assertEquals(0, dirSvc.getLocalDirs().size());
  Assert.assertEquals(0, dirSvc.getLogDirs().size());
  Assert.assertEquals(1, dirSvc.getDiskFullLocalDirs().size());
  Assert.assertEquals(1, dirSvc.getDiskFullLogDirs().size());
  // check the metrics
  Assert.assertEquals(2, nm.getBadLocalDirs());
  Assert.assertEquals(2, nm.getBadLogDirs());
  Assert.assertEquals(0, nm.getGoodLocalDirsDiskUtilizationPerc());
  Assert.assertEquals(0, nm.getGoodLogDirsDiskUtilizationPerc());

  conf.setFloat(YarnConfiguration.NM_MAX_PER_DISK_UTILIZATION_PERCENTAGE,
    100.0f);
  nm = NodeManagerMetrics.create();
  dirSvc = new LocalDirsHandlerService(nm);
  dirSvc.init(conf);
  Assert.assertEquals(1, dirSvc.getLocalDirs().size());
  Assert.assertEquals(1, dirSvc.getLogDirs().size());
  Assert.assertEquals(0, dirSvc.getDiskFullLocalDirs().size());
  Assert.assertEquals(0, dirSvc.getDiskFullLogDirs().size());
  // check the metrics
  File dir = new File(localDir1);
  int utilizationPerc =
      (int) ((dir.getTotalSpace() - dir.getUsableSpace()) * 100 /
          dir.getTotalSpace());
  Assert.assertEquals(1, nm.getBadLocalDirs());
  Assert.assertEquals(1, nm.getBadLogDirs());
  Assert.assertEquals(utilizationPerc,
    nm.getGoodLocalDirsDiskUtilizationPerc());
  Assert
    .assertEquals(utilizationPerc, nm.getGoodLogDirsDiskUtilizationPerc());

  FileUtils.deleteDirectory(new File(localDir1));
  FileUtils.deleteDirectory(new File(localDir2));
  FileUtils.deleteDirectory(new File(logDir1));
  FileUtils.deleteDirectory(new File(logDir1));
  dirSvc.close();
}
 

import org.apache.hadoop.conf.Configuration; //導入方法依賴的package包/類
public void testCompletedMapsForReduceSlowstart() throws Exception {
  MRApp app = new MRApp(2, 1, false, this.getClass().getName(), true);
  Configuration conf = new Configuration();
  //after half of the map completion, reduce will start
  conf.setFloat(MRJobConfig.COMPLETED_MAPS_FOR_REDUCE_SLOWSTART, 0.5f);
  //uberization forces full slowstart (1.0), so disable that
  conf.setBoolean(MRJobConfig.JOB_UBERTASK_ENABLE, false);
  Job job = app.submit(conf);
  app.waitForState(job, JobState.RUNNING);
  //all maps would be running
  Assert.assertEquals("Num tasks not correct", 3, job.getTasks().size());
  Iterator<Task> it = job.getTasks().values().iterator();
  Task mapTask1 = it.next();
  Task mapTask2 = it.next();
  Task reduceTask = it.next();
  
  // all maps must be running
  app.waitForState(mapTask1, TaskState.RUNNING);
  app.waitForState(mapTask2, TaskState.RUNNING);
  
  TaskAttempt task1Attempt = mapTask1.getAttempts().values().iterator().next();
  TaskAttempt task2Attempt = mapTask2.getAttempts().values().iterator().next();
  
  //before sending the TA_DONE, event make sure attempt has come to 
  //RUNNING state
  app.waitForState(task1Attempt, TaskAttemptState.RUNNING);
  app.waitForState(task2Attempt, TaskAttemptState.RUNNING);
  
  // reduces must be in NEW state
  Assert.assertEquals("Reduce Task state not correct",
      TaskState.NEW, reduceTask.getReport().getTaskState());
  
  //send the done signal to the 1st map task
  app.getContext().getEventHandler().handle(
      new TaskAttemptEvent(
          mapTask1.getAttempts().values().iterator().next().getID(),
          TaskAttemptEventType.TA_DONE));
  
  //wait for first map task to complete
  app.waitForState(mapTask1, TaskState.SUCCEEDED);

  //Once the first map completes, it will schedule the reduces
  //now reduce must be running
  app.waitForState(reduceTask, TaskState.RUNNING);
  
  //send the done signal to 2nd map and the reduce to complete the job
  app.getContext().getEventHandler().handle(
      new TaskAttemptEvent(
          mapTask2.getAttempts().values().iterator().next().getID(),
          TaskAttemptEventType.TA_DONE));
  app.getContext().getEventHandler().handle(
      new TaskAttemptEvent(
          reduceTask.getAttempts().values().iterator().next().getID(),
          TaskAttemptEventType.TA_DONE));
  
  app.waitForState(job, JobState.SUCCEEDED);
}
 

import org.apache.hadoop.conf.Configuration; //導入方法依賴的package包/類
@Test(timeout = 30000)
public void testReducerRampdownDiagnostics() throws Exception {
  LOG.info("Running tesReducerRampdownDiagnostics");

  final Configuration conf = new Configuration();
  conf.setFloat(MRJobConfig.COMPLETED_MAPS_FOR_REDUCE_SLOWSTART, 0.0f);
  final MyResourceManager rm = new MyResourceManager(conf);
  rm.start();
  final DrainDispatcher dispatcher = (DrainDispatcher) rm.getRMContext()
      .getDispatcher();
  final RMApp app = rm.submitApp(1024);
  dispatcher.await();

  final String host = "host1";
  final MockNM nm = rm.registerNode(String.format("%s:1234", host), 2048);
  nm.nodeHeartbeat(true);
  dispatcher.await();
  final ApplicationAttemptId appAttemptId = app.getCurrentAppAttempt()
      .getAppAttemptId();
  rm.sendAMLaunched(appAttemptId);
  dispatcher.await();
  final JobId jobId = MRBuilderUtils
      .newJobId(appAttemptId.getApplicationId(), 0);
  final Job mockJob = mock(Job.class);
  when(mockJob.getReport()).thenReturn(
      MRBuilderUtils.newJobReport(jobId, "job", "user", JobState.RUNNING, 0,
          0, 0, 0, 0, 0, 0, "jobfile", null, false, ""));
  final MyContainerAllocator allocator = new MyContainerAllocator(rm, conf,
      appAttemptId, mockJob);
  // add resources to scheduler
  dispatcher.await();

  // create the container request
  final String[] locations = new String[] { host };
  allocator.sendRequest(createReq(jobId, 0, 1024, locations, false, true));
  for (int i = 0; i < 1;) {
    dispatcher.await();
    i += allocator.schedule().size();
    nm.nodeHeartbeat(true);
  }

  allocator.sendRequest(createReq(jobId, 0, 1024, locations, true, false));
  while (allocator.getTaskAttemptKillEvents().size() == 0) {
    dispatcher.await();
    allocator.schedule().size();
    nm.nodeHeartbeat(true);
  }
  final String killEventMessage = allocator.getTaskAttemptKillEvents().get(0)
      .getMessage();
  Assert.assertTrue("No reducer rampDown preemption message",
      killEventMessage.contains(RMContainerAllocator.RAMPDOWN_DIAGNOSTIC));
}