@InterfaceAudience.Private

# Package org.apache.hadoop.mapreduce.v2.app.speculate

- Interface Summary
  Interface | Description
  --- | ---
  Speculator | Speculator component.
  TaskRuntimeEstimator |

- Class Summary
  Class | Description
  --- | ---
  DataStatistics |
  DefaultSpeculator |
  ExponentiallySmoothedTaskRuntimeEstimator | This estimator exponentially smooths the rate of progress versus wallclock time.
  LegacyTaskRuntimeEstimator |
  NullTaskRuntimesEngine |
  SimpleExponentialTaskRuntimeEstimator | A task Runtime Estimator based on exponential smoothing.
  SpeculatorEvent |
  TaskSpeculationPredicate |

- Enum Summary
  Enum | Description
  --- | ---
  ExponentiallySmoothedTaskRuntimeEstimator.SmoothedValue |
  Speculator.EventType |

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