Examples of org.apache.hadoop.util.InjectionHandler

org.apache.hadoop.util.InjectionHandler
t test code class MyInjectionHandler extends InjectionHandler { protected void _processEvent(InjectionEventInterface event, Object... args) { if (event = InjectionEventInterface.MY_EVENT) { LOG.info("Handling my event for fsImage: " + args[0].toString()); } } } public void testMyEvent() { InjectionHandler ih = new MyInjectionHandler(); InjectionHandler.set(ih); ... InjectionHandler.clear(); } // supervised code example class FSImage { private doSomething() { ... if (condition1 && InjectionHandler.trueCondition(MY_EVENT1) { ... } if (condition2 || condition3 || InjectionHandler.falseCondition(MY_EVENT1) { ... } ... InjectionHandler.processEvent(MY_EVENT2, this) ... try { read(); InjectionHandler.processEventIO(MY_EVENT3, this, object); // might throw an exception when testing catch (IOEXception) { LOG.info("Exception") } ... } ... } Each unit test should use a unique event type. The types can be defined by adding them to InjectionEventInterface class. methods: // simulate actions void processEvent() // simulate exceptions void processEventIO() throws IOException // simulate conditions boolean trueCondition() boolean falseCondition() The class implementing InjectionHandler must override respective protected methods _processEvent() _processEventIO() _trueCondition() _falseCondition()

    final AtomicBoolean startKeepThread = new AtomicBoolean(true);
    final AtomicInteger countAutoRolled = new AtomicInteger(0);
    final AtomicBoolean needFail = new AtomicBoolean(false);
    final AtomicLong currentThreadId = new AtomicLong(-1);
    final Object waitFor10Rolls = new Object();
    InjectionHandler.set(new InjectionHandler() {
      @Override
      protected void _processEvent(InjectionEventI event, Object... args) {
        if (event == InjectionEvent.FSEDIT_AFTER_AUTOMATIC_ROLL) {
          countAutoRolled.incrementAndGet();
          if (countAutoRolled.get() >= 10) {

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      FSDataInputStream in = dfs.open(fpath);


      in.read(new byte[512]);


      // By closing the pipeline connection, force a block recovery
      InjectionHandler.set(new InjectionHandler() {
        int thrownCount = 0;


        @Override
        protected void _processEventIO(InjectionEventI event, Object... args)
            throws IOException {
          if (event == InjectionEvent.DFSCLIENT_DATASTREAM_AFTER_WAIT
              && thrownCount < 1) {
            thrownCount++;
            MultiDataOutputStream blockStream = (MultiDataOutputStream) args[0];
            blockStream.close();
          }
        }
      });


      out.write(new byte[512 * 2]);
      out.sync();


      InjectionHandler.set(new InjectionHandler() {
        int thrownCount = 0;


        @SuppressWarnings("unchecked")
        @Override
        protected void _processEventIO(InjectionEventI event, Object... args)

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  @Test
  public void testRaidUI() throws Exception {
    Configuration localConf = new Configuration(conf);
    cnode = RaidNode.createRaidNode(null, localConf);
    InetSocketAddress infoSocAddr = dfsCluster.getNameNode().getHttpAddress();
    InjectionHandler h = new TestRaidHTTPInjectionHandler();
    InjectionHandler.set(h);
    
    LOG.info("First call will fail with timeout because RaidNode UI will " +  
        "hang for 10 seconds. Check TestRaidHTTPInjectionHandler when "  +
        "counter == 1");

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    InetSocketAddress addr = NetUtils.getConnectAddress(server);
    
    final AtomicReference<Hashtable> hashtable = new AtomicReference<Hashtable>(
        null);
    try {
      InjectionHandler.set(new InjectionHandler() {
        @Override
        protected void _processEvent(InjectionEventI event, Object... args) {
          if (event == InjectionEventCore.RPC_CLIENT_SETUP_IO_STREAM_FAILURE) {
            hashtable.set((Hashtable) args[0]);
            throw new RuntimeException("testIOSetupFailure");

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    conf.setInt(HdfsConstants.DFS_DFSCLIENT_QUORUM_READ_THREADPOOL_SIZE, numQuorumPoolThreads);
    conf.setLong(HdfsConstants.DFS_DFSCLIENT_QUORUM_READ_THRESHOLD_MILLIS, 100);
    
    // Set up the InjectionHandler
    // make preads sleep for 60ms
    InjectionHandler.set(new InjectionHandler() {
      public void _processEvent(InjectionEventI event, Object... args) {
        if(event == InjectionEvent.DFSCLIENT_START_FETCH_FROM_DATANODE) {
          try {
            Thread.sleep(60);
          } catch (InterruptedException e) {

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          bufferSize, REPLICATION_NUM, BLOCK_SIZE);
      stm2.write(buffer, 0, size);
      stm2.sync();


      // For one of the datanodes, hang all the block recover requests.
      InjectionHandler.set(new InjectionHandler() {
        AtomicInteger hangDnPort = new AtomicInteger(-1);
        
        @Override
        protected void _processEvent(InjectionEventI event, Object... args) {
          if (event == InjectionEvent.DATANODE_BEFORE_RECOVERBLOCK) {

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    String src = "/testNameNodeFingerprintSent1.txt";
    // Path f = new Path(src);


    // stop a second getAdditionalBlock() from happening too fast
    InjectionHandler.set(new InjectionHandler() {
      int thrownCount = 0;


      @Override
      protected void _processEventIO(InjectionEventI event, Object... args)
          throws IOException {

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      localConf.set("raid.blockfix.classname",
                    "org.apache.hadoop.raid.LocalBlockIntegrityMonitor");
    } else {
      localConf.set("raid.blockfix.classname",
                    "org.apache.hadoop.raid.DistBlockIntegrityMonitor");
      InjectionHandler h = new TestSendRecoveryTimeInjectionHandler();
      InjectionHandler.set(h);
    }
    localConf.setLong("raid.blockfix.filespertask", 2L);
    if (hasChecksumStore) {
      TestBlockFixer.setChecksumStoreConfig(localConf);

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    Configuration newConf = new Configuration(conf);
    USER1 = new UnixUserGroupInformation("foo", new String[] {"bar" });
    UnixUserGroupInformation.saveToConf(newConf,
        UnixUserGroupInformation.UGI_PROPERTY_NAME, USER1);
    userdfs = (DistributedFileSystem)FileSystem.get(newConf); // login as ugi
    InjectionHandler h = new FakeBlockGeneratorInjectionHandler();
    InjectionHandler.set(h);
    rand.nextBytes(bytes);
  }

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    // Fail the test if any node is added to dead nodes.
    // Also verify number of read requests issued to data node is
    // under the correct level.
    final AtomicBoolean needFail = new AtomicBoolean(false);
    final AtomicInteger numReads = new AtomicInteger(0);
    InjectionHandler.set(new InjectionHandler() {
      @Override
      protected void _processEvent(InjectionEventI event, Object... args) {
        if (event == InjectionEvent.DFSCLIENT_BEFORE_ADD_DEADNODES) {
          needFail.set(true);
          try {

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