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t

ml.dmlc.xgboost4j.java

IRabitTracker

trait IRabitTracker extends UncaughtExceptionHandler

Interface for Rabit tracker implementations with three public methods:

  • start(timeout): Start the Rabit tracker awaiting for worker connections, with a given timeout value (in milliseconds.)
  • getWorkerEnvs(): Return the environment variables needed to initialize Rabit clients.
  • waitFor(timeout): Wait for the task execution by the worker nodes for at most timeout milliseconds.

Each implementation is expected to implement a callback function

public void uncaughtException(Threat t, Throwable e) { ... }

to interrupt waitFor() in order to prevent the tracker from hanging indefinitely.

The Rabit tracker handles connections from distributed workers, assigns ranks to workers, and brokers connections between workers.

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UncaughtExceptionHandler, AnyRef, Any
Known Subclasses
RabitTracker
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Abstract Value Members

  1. abstract def getWorkerEnvs(): Map[String, String]
  2. abstract def start(workerConnectionTimeout: Long): Boolean
  3. abstract def stop(): Unit
  4. abstract def uncaughtException(arg0: Thread, arg1: Throwable): Unit
    Definition Classes
    UncaughtExceptionHandler
  5. abstract def waitFor(taskExecutionTimeout: Long): Int

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  15. final def synchronized[T0](arg0: ⇒ T0): T0
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  17. final def wait(): Unit
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  18. final def wait(arg0: Long, arg1: Int): Unit
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  19. final def wait(arg0: Long): Unit
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Inherited from UncaughtExceptionHandler

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