Beispiel #1
0
 @Override
 public Value lazyArrayChunk(final Key key) {
   final Key arykey = ValueArray.getArrayKey(key); // From the base file key
   final long off = (_iceRoot != null) ? 0 : ValueArray.getChunkOffset(key); // The offset
   final Path p =
       (_iceRoot != null)
           ? new Path(_iceRoot, getIceName(key, (byte) 'V'))
           : new Path(arykey.toString());
   final Size sz = new Size();
   run(
       new Callable() {
         @Override
         public Object call() throws Exception {
           FileSystem fs = FileSystem.get(p.toUri(), CONF);
           long rem = fs.getFileStatus(p).getLen() - off;
           sz._value = (rem > ValueArray.CHUNK_SZ * 2) ? (int) ValueArray.CHUNK_SZ : (int) rem;
           return null;
         }
       },
       true,
       0);
   Value val = new Value(key, sz._value, Value.HDFS);
   val.setdsk(); // But its already on disk.
   return val;
 }
Beispiel #2
0
 public static Response redirect(
     JsonObject fromPageResponse, Key rfModel, Key dataKey, boolean oobee) {
   JsonObject redir = new JsonObject();
   redir.addProperty(MODEL_KEY, rfModel.toString());
   redir.addProperty(DATA_KEY, dataKey.toString());
   redir.addProperty(OOBEE, oobee);
   return Response.redirect(fromPageResponse, RFView.class, redir);
 }
Beispiel #3
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 private static void addFolder(FileSystem fs, Path p, JsonArray succeeded, JsonArray failed) {
   try {
     if (fs == null) return;
     for (FileStatus file : fs.listStatus(p)) {
       Path pfs = file.getPath();
       if (file.isDir()) {
         addFolder(fs, pfs, succeeded, failed);
       } else {
         Key k = Key.make(pfs.toString());
         long size = file.getLen();
         Value val = null;
         if (pfs.getName().endsWith(Extensions.JSON)) {
           JsonParser parser = new JsonParser();
           JsonObject json = parser.parse(new InputStreamReader(fs.open(pfs))).getAsJsonObject();
           JsonElement v = json.get(Constants.VERSION);
           if (v == null) throw new RuntimeException("Missing version");
           JsonElement type = json.get(Constants.TYPE);
           if (type == null) throw new RuntimeException("Missing type");
           Class c = Class.forName(type.getAsString());
           OldModel model = (OldModel) c.newInstance();
           model.fromJson(json);
         } else if (pfs.getName().endsWith(Extensions.HEX)) { // Hex file?
           FSDataInputStream s = fs.open(pfs);
           int sz = (int) Math.min(1L << 20, size); // Read up to the 1st meg
           byte[] mem = MemoryManager.malloc1(sz);
           s.readFully(mem);
           // Convert to a ValueArray (hope it fits in 1Meg!)
           ValueArray ary = new ValueArray(k, 0).read(new AutoBuffer(mem));
           val = new Value(k, ary, Value.HDFS);
         } else if (size >= 2 * ValueArray.CHUNK_SZ) {
           val =
               new Value(
                   k,
                   new ValueArray(k, size),
                   Value.HDFS); // ValueArray byte wrapper over a large file
         } else {
           val = new Value(k, (int) size, Value.HDFS); // Plain Value
           val.setdsk();
         }
         DKV.put(k, val);
         Log.info("PersistHdfs: DKV.put(" + k + ")");
         JsonObject o = new JsonObject();
         o.addProperty(Constants.KEY, k.toString());
         o.addProperty(Constants.FILE, pfs.toString());
         o.addProperty(Constants.VALUE_SIZE, file.getLen());
         succeeded.add(o);
       }
     }
   } catch (Exception e) {
     Log.err(e);
     JsonObject o = new JsonObject();
     o.addProperty(Constants.FILE, p.toString());
     o.addProperty(Constants.ERROR, e.getMessage());
     failed.add(o);
   }
 }
Beispiel #4
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 public static InputStream openStream(Key k, ProgressMonitor pmon) throws IOException {
   H2OHdfsInputStream res = null;
   Path p = new Path(k.toString());
   try {
     res = new H2OHdfsInputStream(p, 0, pmon);
   } catch (IOException e) {
     try {
       Thread.sleep(1000);
     } catch (Exception ex) {
     }
     Log.warn("Error while opening HDFS key " + k.toString() + ", will wait and retry.");
     res = new H2OHdfsInputStream(p, 0, pmon);
   }
   return res;
 }
Beispiel #5
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 @Override
 public byte[] load(final Value v) {
   final byte[] b = MemoryManager.malloc1(v._max);
   long skip = 0;
   Key k = v._key;
   final Path p;
   if (_iceRoot != null) {
     p = new Path(_iceRoot, getIceName(v));
   } else {
     // Convert an arraylet chunk into a long-offset from the base file.
     if (k._kb[0] == Key.ARRAYLET_CHUNK) {
       skip = ValueArray.getChunkOffset(k); // The offset
       k = ValueArray.getArrayKey(k); // From the base file key
       if (k.toString().endsWith(Extensions.HEX)) { // Hex file?
         int value_len = DKV.get(k).memOrLoad().length; // How long is the ValueArray header?
         skip += value_len;
       }
     }
     p = new Path(k.toString());
   }
   final long skip_ = skip;
   run(
       new Callable() {
         @Override
         public Object call() throws Exception {
           FileSystem fs = FileSystem.get(p.toUri(), CONF);
           FSDataInputStream s = null;
           try {
             s = fs.open(p);
             // NOTE:
             // The following line degrades performance of HDFS load from S3 API:
             // s.readFully(skip,b,0,b.length);
             // Google API's simple seek has better performance
             // Load of 300MB file via Google API ~ 14sec, via s.readFully ~ 5min (under the same
             // condition)
             ByteStreams.skipFully(s, skip_);
             ByteStreams.readFully(s, b);
             assert v.isPersisted();
           } finally {
             Utils.close(s);
           }
           return null;
         }
       },
       true,
       v._max);
   return b;
 }
Beispiel #6
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 public static String link(Key k, String keyParam, String content) {
   RString rs = new RString("<a href='RFView.query?%key_param=%$key'>%content</a>");
   rs.replace("key_param", keyParam);
   rs.replace("key", k.toString());
   rs.replace("content", content);
   return rs.toString();
 }
Beispiel #7
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    @Override
    protected void init() {
      if (validation != null && n_folds != 0)
        throw new UnsupportedOperationException(
            "Cannot specify a validation dataset and non-zero number of cross-validation folds.");
      if (n_folds < 0)
        throw new UnsupportedOperationException(
            "The number of cross-validation folds must be >= 0.");
      super.init();
      xval_models = new Key[n_folds];
      for (int i = 0; i < xval_models.length; ++i)
        xval_models[i] = Key.make(dest().toString() + "_xval" + i);

      int rIndex = 0;
      for (int i = 0; i < source.vecs().length; i++)
        if (source.vecs()[i] == response) {
          rIndex = i;
          break;
        }
      _responseName = source._names != null && rIndex >= 0 ? source._names[rIndex] : "response";

      _train = selectVecs(source);
      _names = new String[cols.length];
      for (int i = 0; i < cols.length; i++) _names[i] = source._names[cols[i]];

      // Compute source response domain
      if (classification) _sourceResponseDomain = getVectorDomain(response);
      // Is validation specified?
      if (validation != null) {
        // Extract a validation response
        int idx = validation.find(source.names()[rIndex]);
        if (idx == -1)
          throw new IllegalArgumentException(
              "Validation set does not have a response column called " + _responseName);
        _validResponse = validation.vecs()[idx];
        // Compute output confusion matrix domain for classification:
        // - if validation dataset is specified then CM domain is union of train and validation
        // response domains
        //   else it is only domain of response column.
        if (classification) {
          _validResponseDomain = getVectorDomain(_validResponse);
          if (_validResponseDomain != null) {
            _cmDomain = Utils.domainUnion(_sourceResponseDomain, _validResponseDomain);
            if (!Arrays.deepEquals(_sourceResponseDomain, _validResponseDomain)) {
              _fromModel2CM =
                  Model.getDomainMapping(
                      _cmDomain,
                      _sourceResponseDomain,
                      false); // transformation from model produced response ~> cmDomain
              _fromValid2CM =
                  Model.getDomainMapping(
                      _cmDomain,
                      _validResponseDomain,
                      false); // transformation from validation response domain ~> cmDomain
            }
          } else _cmDomain = _sourceResponseDomain;
        } /* end of if classification */
      } else if (classification) _cmDomain = _sourceResponseDomain;
    }
Beispiel #8
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  public static Response redirect(
      JsonObject fromPageResponse,
      Key jobKey,
      Key modelKey,
      Key dataKey,
      int ntree,
      int classCol,
      String weights,
      boolean oobee,
      boolean iterativeCM) {
    JsonObject redirect = new JsonObject();
    if (jobKey != null) redirect.addProperty(JOB, jobKey.toString());
    redirect.addProperty(MODEL_KEY, modelKey.toString());
    redirect.addProperty(DEST_KEY, modelKey.toString());
    redirect.addProperty(DATA_KEY, dataKey.toString());
    redirect.addProperty(NUM_TREES, ntree);
    redirect.addProperty(CLASS, classCol);
    if (weights != null) redirect.addProperty(WEIGHTS, weights);
    redirect.addProperty(OOBEE, oobee);
    redirect.addProperty(ITERATIVE_CM, iterativeCM);

    return Response.redirect(fromPageResponse, RFView.class, redirect);
  }
Beispiel #9
0
 /**
  * Helper to perform the generic part of cross validation Expected to be called from each
  * specific instance's crossValidate method
  *
  * @param splits Frames containing train/test splits
  * @param offsets Array to store the offsets of starting row indices for each cross-validation
  *     run
  * @param i Which fold of cross-validation to perform
  */
 protected final void genericCrossValidation(Frame[] splits, long[] offsets, int i) {
   int respidx = source.find(_responseName);
   assert (respidx != -1) : "response is not found in source!";
   job_key = Key.make(job_key.toString() + "_xval" + i); // make a new Job for CV
   assert (xval_models != null);
   destination_key = xval_models[i];
   source = splits[0];
   validation = splits[1];
   response = source.vecs()[respidx];
   n_folds = 0;
   state = Job.JobState.CREATED; // Hack to allow this job to run
   DKV.put(self(), this); // Needed to pass the Job.isRunning(cvdl.self()) check in FrameTask
   offsets[i + 1] = offsets[i] + validation.numRows();
   _cv =
       true; // Hack to allow init() to pass for ColumnsJob (allow cols/ignored_cols to co-exist)
   invoke();
 }
Beispiel #10
0
 @Override
 public void map(Key key) {
   _rows = new long[_clusters.length];
   _dist = new double[_clusters.length];
   assert key.home();
   ValueArray va = DKV.get(_arykey).get();
   AutoBuffer bits = va.getChunk(key);
   int rows = va.rpc(ValueArray.getChunkIndex(key));
   double[] values = new double[_cols.length - 1];
   ClusterDist cd = new ClusterDist();
   for (int row = 0; row < rows; row++) {
     KMeans.datad(va, bits, row, _cols, _normalized, values);
     KMeans.closest(_clusters, values, cd);
     _rows[cd._cluster]++;
     _dist[cd._cluster] += cd._dist;
   }
   _arykey = null;
   _cols = null;
   _clusters = null;
 }
Beispiel #11
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 /**
  * Creates a new ValueArray with classes. New ValueArray is not aligned with source one
  * unfortunately so have to send results to each chunk owner using Atomic.
  */
 @Override
 public void map(Key key) {
   assert key.home();
   if (Job.isRunning(_job.self())) {
     ValueArray va = DKV.get(_arykey).get();
     AutoBuffer bits = va.getChunk(key);
     long startRow = va.startRow(ValueArray.getChunkIndex(key));
     int rows = va.rpc(ValueArray.getChunkIndex(key));
     int rpc = (int) (ValueArray.CHUNK_SZ / ROW_SIZE);
     long chunk = ValueArray.chknum(startRow, va.numRows(), ROW_SIZE);
     long updatedChk = chunk;
     long updatedRow = startRow;
     double[] values = new double[_cols.length - 1];
     ClusterDist cd = new ClusterDist();
     int[] clusters = new int[rows];
     int count = 0;
     for (int row = 0; row < rows; row++) {
       KMeans.datad(va, bits, row, _cols, _normalized, values);
       KMeans.closest(_clusters, values, cd);
       chunk = ValueArray.chknum(startRow + row, va.numRows(), ROW_SIZE);
       if (chunk != updatedChk) {
         updateClusters(clusters, count, updatedChk, va.numRows(), rpc, updatedRow);
         updatedChk = chunk;
         updatedRow = startRow + row;
         count = 0;
       }
       clusters[count++] = cd._cluster;
     }
     if (count > 0) updateClusters(clusters, count, chunk, va.numRows(), rpc, updatedRow);
     _job.updateProgress(1);
   }
   _job = null;
   _arykey = null;
   _cols = null;
   _clusters = null;
 }
Beispiel #12
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 public ChunkProgressJob(long chunksTotal, Key destinationKey) {
   destination_key = destinationKey;
   _progress =
       Key.make(Key.make()._kb, (byte) 0, Key.DFJ_INTERNAL_USER, destinationKey.home_node());
   UKV.put(_progress, new ChunkProgress(chunksTotal));
 }
Beispiel #13
0
public abstract class Job extends Func {
  static final int API_WEAVER = 1; // This file has auto-gen'd doc & json fields
  public static DocGen.FieldDoc[] DOC_FIELDS; // Initialized from Auto-Gen code.

  /** A system key for global list of Job keys. */
  public static final Key LIST = Key.make(Constants.BUILT_IN_KEY_JOBS, (byte) 0, Key.BUILT_IN_KEY);
  /** Shared empty int array. */
  private static final int[] EMPTY = new int[0];

  @API(help = "Job key")
  public Key job_key;

  @API(
      help = "Destination key",
      filter = Default.class,
      json = true,
      validator = DestKeyValidator.class)
  public Key destination_key; // Key holding final value after job is removed

  static class DestKeyValidator extends NOPValidator<Key> {
    @Override
    public void validateRaw(String value) {
      if (Utils.contains(value, Key.ILLEGAL_USER_KEY_CHARS))
        throw new IllegalArgumentException(
            "Key '"
                + value
                + "' contains illegal character! Please avoid these characters: "
                + Key.ILLEGAL_USER_KEY_CHARS);
    }
  }
  // Output parameters
  @API(help = "Job description")
  public String description;

  @API(help = "Job start time")
  public long start_time;

  @API(help = "Job end time")
  public long end_time;

  @API(help = "Exception")
  public String exception;

  @API(help = "Job state")
  public JobState state;

  public transient H2OCountedCompleter _fjtask; // Top-level task you can block on
  protected transient boolean _cv;

  /** Possible job states. */
  public static enum JobState {
    CREATED, // Job was created
    RUNNING, // Job is running
    CANCELLED, // Job was cancelled by user
    FAILED, // Job crashed, error message/exception is available
    DONE // Job was successfully finished
  }

  public Job(Key jobKey, Key dstKey) {
    job_key = jobKey;
    destination_key = dstKey;
    state = JobState.CREATED;
  }

  public Job() {
    job_key = defaultJobKey();
    description = getClass().getSimpleName();
    state = JobState.CREATED;
  }
  /** Private copy constructor used by {@link JobHandle}. */
  private Job(final Job prior) {
    this(prior.job_key, prior.destination_key);
    this.description = prior.description;
    this.start_time = prior.start_time;
    this.end_time = prior.end_time;
    this.state = prior.state;
    this.exception = prior.exception;
  }

  public Key self() {
    return job_key;
  }

  public Key dest() {
    return destination_key;
  }

  public int gridParallelism() {
    return 1;
  }

  protected Key defaultJobKey() {
    // Pinned to this node (i.e., the node invoked computation), because it should be almost always
    // updated locally
    return Key.make((byte) 0, Key.JOB, H2O.SELF);
  }

  protected Key defaultDestKey() {
    return Key.make(getClass().getSimpleName() + Key.rand());
  }

  /**
   * Start this task based on given top-level fork-join task representing job computation.
   *
   * @param fjtask top-level job computation task.
   * @return this job in {@link JobState#RUNNING} state
   * @see JobState
   * @see H2OCountedCompleter
   */
  public
  /** FIXME: should be final or at least protected */
  Job start(final H2OCountedCompleter fjtask) {
    assert state == JobState.CREATED : "Trying to run job which was already run?";
    assert fjtask != null : "Starting a job with null working task is not permitted! Fix you API";
    _fjtask = fjtask;
    start_time = System.currentTimeMillis();
    state = JobState.RUNNING;
    // Save the full state of the job
    UKV.put(self(), this);
    // Update job list
    new TAtomic<List>() {
      @Override
      public List atomic(List old) {
        if (old == null) old = new List();
        Key[] jobs = old._jobs;
        old._jobs = Arrays.copyOf(jobs, jobs.length + 1);
        old._jobs[jobs.length] = job_key;
        return old;
      }
    }.invoke(LIST);
    return this;
  }

  /**
   * Return progress of this job.
   *
   * @return the value in interval &lt;0,1&gt; representing job progress.
   */
  public float progress() {
    Freezable f = UKV.get(destination_key);
    if (f instanceof Progress) return ((Progress) f).progress();
    return 0;
  }

  /**
   * Blocks and get result of this job.
   *
   * <p>The call blocks on working task which was passed via {@link #start(H2OCountedCompleter)}
   * method and returns the result which is fetched from UKV based on job destination key.
   *
   * @return result of this job fetched from UKV by destination key.
   * @see #start(H2OCountedCompleter)
   * @see UKV
   */
  public <T> T get() {
    _fjtask.join(); // Block until top-level job is done
    T ans = (T) UKV.get(destination_key);
    remove(); // Remove self-job
    return ans;
  }

  /**
   * Signal cancellation of this job.
   *
   * <p>The job will be switched to state {@link JobState#CANCELLED} which signals that the job was
   * cancelled by a user.
   */
  public void cancel() {
    cancel((String) null, JobState.CANCELLED);
  }
  /**
   * Signal exceptional cancellation of this job.
   *
   * @param ex exception causing the termination of job.
   */
  public void cancel(Throwable ex) {
    if (ex instanceof JobCancelledException
        || ex.getMessage() != null && ex.getMessage().contains("job was cancelled")) return;
    if (ex instanceof IllegalArgumentException
        || ex.getCause() instanceof IllegalArgumentException) {
      cancel("Illegal argument: " + ex.getMessage());
      return;
    }
    StringWriter sw = new StringWriter();
    PrintWriter pw = new PrintWriter(sw);
    ex.printStackTrace(pw);
    String stackTrace = sw.toString();
    cancel(
        "Got exception '" + ex.getClass() + "', with msg '" + ex.getMessage() + "'\n" + stackTrace,
        JobState.FAILED);
    if (_fjtask != null && !_fjtask.isDone()) _fjtask.completeExceptionally(ex);
  }
  /**
   * Signal exceptional cancellation of this job.
   *
   * @param msg cancellation message explaining reason for cancelation
   */
  public void cancel(final String msg) {
    JobState js = msg == null ? JobState.CANCELLED : JobState.FAILED;
    cancel(msg, js);
  }

  private void cancel(final String msg, JobState resultingState) {
    if (resultingState == JobState.CANCELLED) {
      Log.info("Job " + self() + "(" + description + ") was cancelled.");
    } else {
      Log.err("Job " + self() + "(" + description + ") failed.");
      Log.err(msg);
    }
    exception = msg;
    state = resultingState;
    // replace finished job by a job handle
    replaceByJobHandle();
    DKV.write_barrier();
    final Job job = this;
    H2O.submitTask(
        new H2OCountedCompleter() {
          @Override
          public void compute2() {
            job.onCancelled();
          }
        });
  }

  /** Callback which is called after job cancellation (by user, by exception). */
  protected void onCancelled() {}

  /**
   * Returns true if the job was cancelled by the user or crashed.
   *
   * @return true if the job is in state {@link JobState#CANCELLED} or {@link JobState#FAILED}
   */
  public boolean isCancelledOrCrashed() {
    return state == JobState.CANCELLED || state == JobState.FAILED;
  }

  /**
   * Returns true if the job was terminated by unexpected exception.
   *
   * @return true, if the job was terminated by unexpected exception.
   */
  public boolean isCrashed() {
    return state == JobState.FAILED;
  }

  /**
   * Returns true if this job is correctly finished.
   *
   * @return returns true if the job finished and it was not cancelled or crashed by an exception.
   */
  public boolean isDone() {
    return state == JobState.DONE;
  }

  /**
   * Returns true if this job is running
   *
   * @return returns true only if this job is in running state.
   */
  public boolean isRunning() {
    return state == JobState.RUNNING;
  }

  public JobState getState() {
    return state;
  }

  /**
   * Returns a list of all jobs in a system.
   *
   * @return list of all jobs including running, done, cancelled, crashed jobs.
   */
  public static Job[] all() {
    List list = UKV.get(LIST);
    Job[] jobs = new Job[list == null ? 0 : list._jobs.length];
    int j = 0;
    for (int i = 0; i < jobs.length; i++) {
      Job job = UKV.get(list._jobs[i]);
      if (job != null) jobs[j++] = job;
    }
    if (j < jobs.length) jobs = Arrays.copyOf(jobs, j);
    return jobs;
  }
  /**
   * Check if given job is running.
   *
   * @param job_key job key
   * @return true if job is still running else returns false.
   */
  public static boolean isRunning(Key job_key) {
    Job j = UKV.get(job_key);
    assert j != null : "Job should be always in DKV!";
    return j.isRunning();
  }
  /**
   * Returns true if job is not running. The job can be cancelled, crashed, or already done.
   *
   * @param jobkey job identification key
   * @return true if job is done, cancelled, or crashed, else false
   */
  public static boolean isEnded(Key jobkey) {
    return !isRunning(jobkey);
  }

  /** Marks job as finished and records job end time. */
  public void remove() {
    end_time = System.currentTimeMillis();
    if (state == JobState.RUNNING) state = JobState.DONE;
    // Overwrite handle - copy end_time, state, msg
    replaceByJobHandle();
  }

  /**
   * Finds a job with given key or returns null.
   *
   * @param jobkey job key
   * @return returns a job with given job key or null if a job is not found.
   */
  public static Job findJob(final Key jobkey) {
    return UKV.get(jobkey);
  }

  /** Finds a job with given dest key or returns null */
  public static Job findJobByDest(final Key destKey) {
    Job job = null;
    for (Job current : Job.all()) {
      if (current.dest().equals(destKey)) {
        job = current;
        break;
      }
    }
    return job;
  }

  /**
   * Returns job execution time in milliseconds. If job is not running then returns job execution
   * time.
   */
  public final long runTimeMs() {
    long until = end_time != 0 ? end_time : System.currentTimeMillis();
    return until - start_time;
  }

  /** Description of a speed criteria: msecs/frob */
  public String speedDescription() {
    return null;
  }

  /** Value of the described speed criteria: msecs/frob */
  public long speedValue() {
    return 0;
  }

  @Override
  protected Response serve() {
    fork();
    return redirect();
  }

  protected Response redirect() {
    return Progress2.redirect(this, job_key, destination_key);
  }

  /**
   * Forks computation of this job.
   *
   * <p>The call does not block.
   *
   * @return always returns this job.
   */
  public Job fork() {
    init();
    H2OCountedCompleter task =
        new H2OCountedCompleter() {
          @Override
          public void compute2() {
            try {
              try {
                // Exec always waits till the end of computation
                Job.this.exec();
                Job.this.remove();
              } catch (Throwable t) {
                if (!(t instanceof ExpectedExceptionForDebug)) Log.err(t);
                Job.this.cancel(t);
              }
            } finally {
              tryComplete();
            }
          }
        };
    start(task);
    H2O.submitTask(task);
    return this;
  }

  @Override
  public void invoke() {
    init();
    start(new H2OEmptyCompleter()); // mark job started
    exec(); // execute the implementation
    remove(); // remove the job
  }

  /**
   * Invoked before job runs. This is the place to checks arguments are valid or throw
   * IllegalArgumentException. It will get invoked both from the Web and Java APIs.
   *
   * @throws IllegalArgumentException throws the exception if initialization fails to ensure correct
   *     job runtime environment.
   */
  @Override
  protected void init() throws IllegalArgumentException {
    if (destination_key == null) destination_key = defaultDestKey();
  }

  /**
   * Block synchronously waiting for a job to end, success or not.
   *
   * @param jobkey Job to wait for.
   * @param pollingIntervalMillis Polling interval sleep time.
   */
  public static void waitUntilJobEnded(Key jobkey, int pollingIntervalMillis) {
    while (true) {
      if (Job.isEnded(jobkey)) {
        return;
      }

      try {
        Thread.sleep(pollingIntervalMillis);
      } catch (Exception ignore) {
      }
    }
  }

  /**
   * Block synchronously waiting for a job to end, success or not.
   *
   * @param jobkey Job to wait for.
   */
  public static void waitUntilJobEnded(Key jobkey) {
    int THREE_SECONDS_MILLIS = 3 * 1000;
    waitUntilJobEnded(jobkey, THREE_SECONDS_MILLIS);
  }

  public static class ChunkProgress extends Iced implements Progress {
    final long _nchunks;
    final long _count;
    private final Status _status;
    final String _error;

    public enum Status {
      Computing,
      Done,
      Cancelled,
      Error
    }

    public Status status() {
      return _status;
    }

    public boolean isDone() {
      return _status == Status.Done || _status == Status.Error;
    }

    public String error() {
      return _error;
    }

    public ChunkProgress(long chunksTotal) {
      _nchunks = chunksTotal;
      _count = 0;
      _status = Status.Computing;
      _error = null;
    }

    private ChunkProgress(long nchunks, long computed, Status s, String err) {
      _nchunks = nchunks;
      _count = computed;
      _status = s;
      _error = err;
    }

    public ChunkProgress update(int count) {
      if (_status == Status.Cancelled || _status == Status.Error) return this;
      long c = _count + count;
      return new ChunkProgress(_nchunks, c, Status.Computing, null);
    }

    public ChunkProgress done() {
      return new ChunkProgress(_nchunks, _nchunks, Status.Done, null);
    }

    public ChunkProgress cancel() {
      return new ChunkProgress(0, 0, Status.Cancelled, null);
    }

    public ChunkProgress error(String msg) {
      return new ChunkProgress(0, 0, Status.Error, msg);
    }

    @Override
    public float progress() {
      if (_status == Status.Done) return 1.0f;
      return Math.min(0.99f, (float) ((double) _count / (double) _nchunks));
    }
  }

  public static class ChunkProgressJob extends Job {
    Key _progress;

    public ChunkProgressJob(long chunksTotal, Key destinationKey) {
      destination_key = destinationKey;
      _progress =
          Key.make(Key.make()._kb, (byte) 0, Key.DFJ_INTERNAL_USER, destinationKey.home_node());
      UKV.put(_progress, new ChunkProgress(chunksTotal));
    }

    public void updateProgress(final int c) { // c == number of processed chunks
      if (isRunning(self())) {
        new TAtomic<ChunkProgress>() {
          @Override
          public ChunkProgress atomic(ChunkProgress old) {
            if (old == null) return null;
            return old.update(c);
          }
        }.fork(_progress);
      }
    }

    @Override
    public void remove() {
      super.remove();
      UKV.remove(_progress);
    }

    public final Key progressKey() {
      return _progress;
    }

    public void onException(Throwable ex) {
      UKV.remove(dest());
      Value v = DKV.get(progressKey());
      if (v != null) {
        ChunkProgress p = v.get();
        p = p.error(ex.getMessage());
        DKV.put(progressKey(), p);
      }
      cancel(ex);
    }
  }

  public static boolean checkIdx(Frame source, int[] idx) {
    for (int i : idx) if (i < 0 || i > source.vecs().length - 1) return false;
    return true;
  }

  /* Update end_time, state, msg, preserve start_time */
  private void replaceByJobHandle() {
    assert state != JobState.RUNNING : "Running job cannot be replaced.";
    final Job self = this;
    new TAtomic<Job>() {
      @Override
      public Job atomic(Job old) {
        if (old == null) return null;
        JobHandle jh = new JobHandle(self);
        jh.start_time = old.start_time;
        return jh;
      }
    }.fork(job_key);
  }

  /**
   * A job which operates with a frame.
   *
   * <p>INPUT frame
   */
  public abstract static class FrameJob extends Job {
    static final int API_WEAVER = 1;
    public static DocGen.FieldDoc[] DOC_FIELDS;

    @API(help = "Source frame", required = true, filter = Default.class, json = true)
    public Frame source;

    /**
     * Annotate the number of columns and rows of the training data set in the job parameter JSON
     *
     * @return JsonObject annotated with num_cols and num_rows of the training data set
     */
    @Override
    public JsonObject toJSON() {
      JsonObject jo = super.toJSON();
      if (source != null) {
        jo.getAsJsonObject("source").addProperty("num_cols", source.numCols());
        jo.getAsJsonObject("source").addProperty("num_rows", source.numRows());
      }
      return jo;
    }
  }

  /**
   * A job which has an input represented by a frame and frame column filter. The filter can be
   * specified by ignored columns or by used columns.
   *
   * <p>INPUT list ignored columns by idx XOR list of ignored columns by name XOR list of used
   * columns
   *
   * @see FrameJob
   */
  public abstract static class ColumnsJob extends FrameJob {
    static final int API_WEAVER = 1;
    public static DocGen.FieldDoc[] DOC_FIELDS;

    @API(help = "Input columns (Indexes start at 0)", filter = colsFilter.class, hide = true)
    public int[] cols;

    class colsFilter extends MultiVecSelect {
      public colsFilter() {
        super("source");
      }
    }

    @API(
        help = "Ignored columns by name and zero-based index",
        filter = colsNamesIdxFilter.class,
        displayName = "Ignored columns")
    public int[] ignored_cols;

    class colsNamesIdxFilter extends MultiVecSelect {
      public colsNamesIdxFilter() {
        super("source", MultiVecSelectType.NAMES_THEN_INDEXES);
      }
    }

    @API(
        help = "Ignored columns by name",
        filter = colsNamesFilter.class,
        displayName = "Ignored columns by name",
        hide = true)
    public int[] ignored_cols_by_name = EMPTY;

    class colsNamesFilter extends MultiVecSelect {
      public colsNamesFilter() {
        super("source", MultiVecSelectType.NAMES_ONLY);
      }
    }

    /**
     * Annotate the used and ignored columns in the job parameter JSON For both the used and the
     * ignored columns, the following rules apply: If the number of columns is less or equal than
     * 100, a dense list of used columns is reported. If the number of columns is greater than 100,
     * the number of columns is reported. If the number of columns is 0, a "N/A" is reported.
     *
     * @return JsonObject annotated with used/ignored columns
     */
    @Override
    public JsonObject toJSON() {
      JsonObject jo = super.toJSON();
      if (!jo.has("source") || source == null) return jo;
      HashMap<String, int[]> map = new HashMap<String, int[]>();
      map.put("used_cols", cols);
      map.put("ignored_cols", ignored_cols);
      for (String key : map.keySet()) {
        int[] val = map.get(key);
        if (val != null) {
          if (val.length > 100) jo.getAsJsonObject("source").addProperty("num_" + key, val.length);
          else if (val.length > 0) {
            StringBuilder sb = new StringBuilder();
            for (int c : val) sb.append(c + ",");
            jo.getAsJsonObject("source")
                .addProperty(key, sb.toString().substring(0, sb.length() - 1));
          } else {
            jo.getAsJsonObject("source").add(key, JsonNull.INSTANCE);
          }
        }
      }
      return jo;
    }

    @Override
    protected void init() {
      super.init();
      if (_cv) return;

      // At most one of the following may be specified.
      int specified = 0;
      if (!isEmpty(cols)) {
        specified++;
      }
      if (!isEmpty(ignored_cols)) {
        specified++;
      }
      if (!isEmpty(ignored_cols_by_name)) {
        specified++;
      }
      if (specified > 1)
        throw new IllegalArgumentException(
            "Arguments 'cols', 'ignored_cols_by_name', and 'ignored_cols' are exclusive");

      // Unify all ignored cols specifiers to ignored_cols.
      {
        if (!isEmpty(ignored_cols_by_name)) {
          assert (isEmpty(ignored_cols));
          ignored_cols = ignored_cols_by_name;
          ignored_cols_by_name = EMPTY;
        }
        if (ignored_cols == null) {
          ignored_cols = new int[0];
        }
      }

      // At this point, ignored_cols_by_name is dead.
      assert (isEmpty(ignored_cols_by_name));

      // Create map of ignored columns for speed.
      HashMap<Integer, Integer> ignoredColsMap = new HashMap<Integer, Integer>();
      for (int i = 0; i < ignored_cols.length; i++) {
        int value = ignored_cols[i];
        ignoredColsMap.put(new Integer(value), new Integer(1));
      }

      // Add UUID cols to ignoredColsMap.  Duplicates get folded into one entry.
      Vec[] vecs = source.vecs();
      for (int i = 0; i < vecs.length; i++) {
        if (vecs[i].isUUID()) {
          ignoredColsMap.put(new Integer(i), new Integer(1));
        }
      }

      // Rebuild ignored_cols from the map.  Sort it.
      {
        ignored_cols = new int[ignoredColsMap.size()];
        int j = 0;
        for (Integer key : ignoredColsMap.keySet()) {
          ignored_cols[j] = key.intValue();
          j++;
        }

        Arrays.sort(ignored_cols);
      }

      // If the columns are not specified, then select everything.
      if (isEmpty(cols)) {
        cols = new int[source.vecs().length];
        for (int i = 0; i < cols.length; i++) cols[i] = i;
      } else {
        if (!checkIdx(source, cols))
          throw new IllegalArgumentException("Argument 'cols' specified invalid column!");
      }

      // Make a set difference between cols and ignored_cols.
      if (!isEmpty(ignored_cols)) {
        int[] icols = !isEmpty(ignored_cols) ? ignored_cols : ignored_cols_by_name;
        if (!checkIdx(source, icols))
          throw new IllegalArgumentException(
              "Argument 'ignored_cols' or 'ignored_cols_by_name' specified invalid column!");
        cols = difference(cols, icols);
        // Setup all variables in consistent way
        ignored_cols = icols;
        ignored_cols_by_name = icols;
      }

      if (cols.length == 0) {
        throw new IllegalArgumentException("No column selected");
      }
    }

    protected final Vec[] selectVecs(Frame frame) {
      Vec[] vecs = new Vec[cols.length];
      for (int i = 0; i < cols.length; i++) vecs[i] = frame.vecs()[cols[i]];
      return vecs;
    }

    protected final Frame selectFrame(Frame frame) {
      Vec[] vecs = new Vec[cols.length];
      String[] names = new String[cols.length];
      for (int i = 0; i < cols.length; i++) {
        vecs[i] = frame.vecs()[cols[i]];
        names[i] = frame.names()[cols[i]];
      }
      return new Frame(names, vecs);
    }
  }

  /**
   * A columns job that requires a response.
   *
   * <p>INPUT response column from source
   */
  public abstract static class ColumnsResJob extends ColumnsJob {
    static final int API_WEAVER = 1;
    public static DocGen.FieldDoc[] DOC_FIELDS;

    @API(
        help = "Column to use as class",
        required = true,
        filter = responseFilter.class,
        json = true)
    public Vec response;

    class responseFilter extends VecClassSelect {
      responseFilter() {
        super("source");
      }
    }

    @Override
    protected void registered(API_VERSION ver) {
      super.registered(ver);
      Argument c = find("ignored_cols");
      Argument r = find("response");
      int ci = _arguments.indexOf(c);
      int ri = _arguments.indexOf(r);
      _arguments.set(ri, c);
      _arguments.set(ci, r);
      ((FrameKeyMultiVec) c).setResponse((FrameClassVec) r);
    }

    /**
     * Annotate the name of the response column in the job parameter JSON
     *
     * @return JsonObject annotated with the name of the response column
     */
    @Override
    public JsonObject toJSON() {
      JsonObject jo = super.toJSON();
      if (source != null) {
        int idx = source.find(response);
        if (idx == -1) {
          Vec vm = response.masterVec();
          if (vm != null) idx = source.find(vm);
        }
        jo.getAsJsonObject("response")
            .add("name", new JsonPrimitive(idx == -1 ? "null" : source._names[idx]));
      }
      return jo;
    }

    @Override
    protected void init() {
      super.init();
      // Check if it make sense to build a model
      if (source.numRows() == 0)
        throw new H2OIllegalArgumentException(
            find("source"), "Cannot build a model on empty dataset!");
      // Does not alter the Response to an Enum column if Classification is
      // asked for: instead use the classification flag to decide between
      // classification or regression.
      Vec[] vecs = source.vecs();
      for (int i = cols.length - 1; i >= 0; i--)
        if (vecs[cols[i]] == response) cols = Utils.remove(cols, i);

      final boolean has_constant_response =
          response.isEnum() ? response.domain().length <= 1 : response.min() == response.max();
      if (has_constant_response)
        throw new H2OIllegalArgumentException(find("response"), "Constant response column!");
    }
  }

  /**
   * A job producing a model.
   *
   * <p>INPUT response column from source
   */
  public abstract static class ModelJob extends ModelJobWithoutClassificationField {
    static final int API_WEAVER = 1;
    public static DocGen.FieldDoc[] DOC_FIELDS;

    @API(help = "Do classification or regression", filter = myClassFilter.class, json = true)
    public boolean classification =
        true; // we need 3-state boolean: unspecified, true/false BUT we solve that by checking UI
    // layer to see if the classification parameter was passed

    class myClassFilter extends DoClassBoolean {
      myClassFilter() {
        super("source");
      }
    }

    @Override
    protected void init() {
      super.init();
      // Reject request if classification is required and response column is float
      // Argument a4class = find("classification"); // get UI control
      // String p4class = input("classification");  // get value from HTTP requests
      // if there is UI control and classification field was passed
      final boolean classificationFieldSpecified =
          true; // ROLLBACK: a4class!=null ? p4class!=null : /* we are not in UI so expect that
      // parameter is specified correctly */ true;
      if (!classificationFieldSpecified) { // can happen if a client sends a request which does not
        // specify classification parameter
        classification = response.isEnum();
        Log.warn(
            "Classification field is not specified - deriving according to response! The classification field set to "
                + classification);
      } else {
        if (classification && response.isFloat())
          throw new H2OIllegalArgumentException(
              find("classification"), "Requested classification on float column!");
        if (!classification && response.isEnum())
          throw new H2OIllegalArgumentException(
              find("classification"), "Requested regression on enum column!");
      }
    }
  }

  /**
   * A job producing a model that has no notion of Classification or Regression.
   *
   * <p>INPUT response column from source
   */
  public abstract static class ModelJobWithoutClassificationField extends ColumnsResJob {
    // This exists to support GLM2, which determines classification/regression using the
    // family field, not a second separate field.
  }

  /** Job which produces model and validate it on a given dataset. INPUT validation frame */
  public abstract static class ValidatedJob extends ModelJob {
    static final int API_WEAVER = 1;
    public static DocGen.FieldDoc[] DOC_FIELDS;
    protected transient Vec[] _train, _valid;
    /** Validation vector extracted from validation frame. */
    protected transient Vec _validResponse;
    /**
     * Validation response domain or null if validation is not specified or null if response is
     * float.
     */
    protected transient String[] _validResponseDomain;
    /** Source response domain or null if response is float. */
    protected transient String[] _sourceResponseDomain;
    /** CM domain derived from {@link #_validResponseDomain} and {@link #_sourceResponseDomain}. */
    protected transient String[] _cmDomain;
    /** Names of columns */
    protected transient String[] _names;
    /** Name of validation response. Should be same as source response. */
    public transient String _responseName;

    /** Adapted validation frame to a computed model. */
    private transient Frame _adaptedValidation;

    private transient Vec
        _adaptedValidationResponse; // Validation response adapted to computed CM domain
    private transient int[][]
        _fromModel2CM; // Transformation for model response to common CM domain
    private transient int[][]
        _fromValid2CM; // Transformation for validation response to common CM domain

    @API(help = "Validation frame", filter = Default.class, mustExist = true, json = true)
    public Frame validation;

    @API(
        help = "Number of folds for cross-validation (if no validation data is specified)",
        filter = Default.class,
        json = true)
    public int n_folds = 0;

    @API(help = "Keep cross-validation dataset splits", filter = Default.class, json = true)
    public boolean keep_cross_validation_splits = false;

    @API(help = "Cross-validation models", json = true)
    public Key[] xval_models;

    public int _cv_count = 0;

    /**
     * Helper to compute the actual progress if we're doing cross-validation. This method is
     * supposed to be called by the progress() implementation for CV-capable algos.
     *
     * @param p Progress reported by the main job
     * @return actual progress if CV is done, otherwise returns p
     */
    public float cv_progress(float p) {
      if (n_folds >= 2) {
        return (p + _cv_count)
            / (n_folds + 1); // divide by 1 more to account for final scoring as extra work
      }
      return p;
    }

    /**
     * Helper to specify which arguments trigger a refresh on change
     *
     * @param ver
     */
    @Override
    protected void registered(RequestServer.API_VERSION ver) {
      super.registered(ver);
      for (Argument arg : _arguments) {
        if (arg._name.equals("validation")) {
          arg.setRefreshOnChange();
        }
      }
    }

    /**
     * Helper to handle arguments based on existing input values
     *
     * @param arg
     * @param inputArgs
     */
    @Override
    protected void queryArgumentValueSet(Argument arg, java.util.Properties inputArgs) {
      super.queryArgumentValueSet(arg, inputArgs);
      if (arg._name.equals("n_folds") && validation != null) {
        arg.disable("Only if no validation dataset is provided.");
        n_folds = 0;
      }
    }

    /**
     * Cross-Validate this Job (to be overridden for each instance, which also calls
     * genericCrossValidation)
     *
     * @param splits Frames containing train/test splits
     * @param cv_preds Store the predictions for each cross-validation run
     * @param offsets Array to store the offsets of starting row indices for each cross-validation
     *     run
     * @param i Which fold of cross-validation to perform
     */
    public void crossValidate(Frame[] splits, Frame[] cv_preds, long[] offsets, int i) {
      throw H2O.unimpl();
    }

    /**
     * Helper to perform the generic part of cross validation Expected to be called from each
     * specific instance's crossValidate method
     *
     * @param splits Frames containing train/test splits
     * @param offsets Array to store the offsets of starting row indices for each cross-validation
     *     run
     * @param i Which fold of cross-validation to perform
     */
    protected final void genericCrossValidation(Frame[] splits, long[] offsets, int i) {
      int respidx = source.find(_responseName);
      assert (respidx != -1) : "response is not found in source!";
      job_key = Key.make(job_key.toString() + "_xval" + i); // make a new Job for CV
      assert (xval_models != null);
      destination_key = xval_models[i];
      source = splits[0];
      validation = splits[1];
      response = source.vecs()[respidx];
      n_folds = 0;
      state = Job.JobState.CREATED; // Hack to allow this job to run
      DKV.put(self(), this); // Needed to pass the Job.isRunning(cvdl.self()) check in FrameTask
      offsets[i + 1] = offsets[i] + validation.numRows();
      _cv =
          true; // Hack to allow init() to pass for ColumnsJob (allow cols/ignored_cols to co-exist)
      invoke();
    }

    /**
     * Annotate the number of columns and rows of the validation data set in the job parameter JSON
     *
     * @return JsonObject annotated with num_cols and num_rows of the validation data set
     */
    @Override
    public JsonObject toJSON() {
      JsonObject jo = super.toJSON();
      if (validation != null) {
        jo.getAsJsonObject("validation").addProperty("num_cols", validation.numCols());
        jo.getAsJsonObject("validation").addProperty("num_rows", validation.numRows());
      }
      return jo;
    }

    @Override
    protected void init() {
      if (validation != null && n_folds != 0)
        throw new UnsupportedOperationException(
            "Cannot specify a validation dataset and non-zero number of cross-validation folds.");
      if (n_folds < 0)
        throw new UnsupportedOperationException(
            "The number of cross-validation folds must be >= 0.");
      super.init();
      xval_models = new Key[n_folds];
      for (int i = 0; i < xval_models.length; ++i)
        xval_models[i] = Key.make(dest().toString() + "_xval" + i);

      int rIndex = 0;
      for (int i = 0; i < source.vecs().length; i++)
        if (source.vecs()[i] == response) {
          rIndex = i;
          break;
        }
      _responseName = source._names != null && rIndex >= 0 ? source._names[rIndex] : "response";

      _train = selectVecs(source);
      _names = new String[cols.length];
      for (int i = 0; i < cols.length; i++) _names[i] = source._names[cols[i]];

      // Compute source response domain
      if (classification) _sourceResponseDomain = getVectorDomain(response);
      // Is validation specified?
      if (validation != null) {
        // Extract a validation response
        int idx = validation.find(source.names()[rIndex]);
        if (idx == -1)
          throw new IllegalArgumentException(
              "Validation set does not have a response column called " + _responseName);
        _validResponse = validation.vecs()[idx];
        // Compute output confusion matrix domain for classification:
        // - if validation dataset is specified then CM domain is union of train and validation
        // response domains
        //   else it is only domain of response column.
        if (classification) {
          _validResponseDomain = getVectorDomain(_validResponse);
          if (_validResponseDomain != null) {
            _cmDomain = Utils.domainUnion(_sourceResponseDomain, _validResponseDomain);
            if (!Arrays.deepEquals(_sourceResponseDomain, _validResponseDomain)) {
              _fromModel2CM =
                  Model.getDomainMapping(
                      _cmDomain,
                      _sourceResponseDomain,
                      false); // transformation from model produced response ~> cmDomain
              _fromValid2CM =
                  Model.getDomainMapping(
                      _cmDomain,
                      _validResponseDomain,
                      false); // transformation from validation response domain ~> cmDomain
            }
          } else _cmDomain = _sourceResponseDomain;
        } /* end of if classification */
      } else if (classification) _cmDomain = _sourceResponseDomain;
    }

    protected String[] getVectorDomain(final Vec v) {
      assert v == null || v.isInt() || v.isEnum() : "Cannot get vector domain!";
      if (v == null) return null;
      String[] r;
      if (v.isEnum()) {
        r = v.domain();
      } else {
        Vec tmp = v.toEnum();
        r = tmp.domain();
        UKV.remove(tmp._key);
      }
      return r;
    }

    /** Returns true if the job has specified validation dataset. */
    protected final boolean hasValidation() {
      return validation != null;
    }
    /** Returns a domain for confusion matrix. */
    protected final String[] getCMDomain() {
      return _cmDomain;
    }
    /** Return validation dataset which can be adapted to a model if it is necessary. */
    protected final Frame getValidation() {
      return _adaptedValidation != null ? _adaptedValidation : validation;
    };
    /** Returns original validation dataset. */
    protected final Frame getOrigValidation() {
      return validation;
    }

    public final Response2CMAdaptor getValidAdaptor() {
      return new Response2CMAdaptor();
    }

    /** */
    protected final void prepareValidationWithModel(final Model model) {
      if (validation == null) return;
      Frame[] av = model.adapt(validation, false);
      _adaptedValidation = av[0];
      gtrash(av[1]); // delete this after computation
      if (_fromValid2CM != null) {
        assert classification
            : "Validation response transformation should be declared only for classification!";
        assert _fromModel2CM != null
            : "Model response transformation should exist if validation response transformation exists!";
        Vec tmp = _validResponse.toEnum();
        _adaptedValidationResponse =
            tmp.makeTransf(
                _fromValid2CM, getCMDomain()); // Add an original response adapted to CM domain
        gtrash(_adaptedValidationResponse); // Add the created vector to a clean-up list
        gtrash(tmp);
      }
    }

    /** A micro helper for transforming model/validation responses to confusion matrix domain. */
    public class Response2CMAdaptor {
      /**
       * Adapt given vector produced by a model to confusion matrix domain. Always return a new
       * vector which needs to be deleted.
       */
      public Vec adaptModelResponse2CM(final Vec v) {
        return v.makeTransf(_fromModel2CM, getCMDomain());
      }
      /**
       * Adapt given validation vector to confusion matrix domain. Always return a new vector which
       * needs to be deleted.
       */
      public Vec adaptValidResponse2CM(final Vec v) {
        return v.makeTransf(_fromValid2CM, getCMDomain());
      }
      /** Returns validation dataset. */
      public Frame getValidation() {
        return ValidatedJob.this.getValidation();
      }
      /** Return cached validation response already adapted to CM domain. */
      public Vec getAdaptedValidationResponse2CM() {
        return _adaptedValidationResponse;
      }
      /** Return cm domain. */
      public String[] getCMDomain() {
        return ValidatedJob.this.getCMDomain();
      }
      /**
       * Returns true if model/validation responses need to be adapted to confusion matrix domain.
       */
      public boolean needsAdaptation2CM() {
        return _fromModel2CM != null;
      }
      /** Return the adapted response name */
      public String adaptedValidationResponse(final String response) {
        return response + ".adapted";
      }
    }
  }

  /** */
  public interface Progress {
    float progress();
  }

  public interface ProgressMonitor {
    public void update(long n);
  }

  public static class Fail extends Iced {
    public final String _message;

    public Fail(String message) {
      _message = message;
    }
  }

  public static final class List extends Iced {
    Key[] _jobs = new Key[0];

    @Override
    public List clone() {
      List l = new List();
      l._jobs = _jobs.clone();
      for (int i = 0; i < l._jobs.length; ++i) l._jobs[i] = (Key) l._jobs[i].clone();
      return l;
    }
  }

  /** Almost lightweight job handle containing the same content as pure Job class. */
  public static class JobHandle extends Job {
    public JobHandle(final Job job) {
      super(job);
    }
  }

  public static class JobCancelledException extends RuntimeException {
    public JobCancelledException() {
      super("job was cancelled!");
    }

    public JobCancelledException(String msg) {
      super("job was cancelled! with msg '" + msg + "'");
    }
  }

  /** Hygienic method to prevent accidental capture of non desired values. */
  public static <T extends FrameJob> T hygiene(T job) {
    job.source = null;
    return job;
  }

  public static <T extends ValidatedJob> T hygiene(T job) {
    job.source = null;
    job.validation = null;
    return job;
  }
}
Beispiel #14
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 protected Key defaultDestKey() {
   return Key.make(getClass().getSimpleName() + Key.rand());
 }
Beispiel #15
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 protected Key defaultJobKey() {
   // Pinned to this node (i.e., the node invoked computation), because it should be almost always
   // updated locally
   return Key.make((byte) 0, Key.JOB, H2O.SELF);
 }