Package ml.dmlc.xgboost4j.java

Interface ITracker

All Superinterfaces:
Thread.UncaughtExceptionHandler
All Known Implementing Classes:
RabitTracker
public interface ITracker extends Thread.UncaughtExceptionHandler
Interface for a tracker implementations with three public methods: - start(timeout): Start the tracker awaiting for worker connections, with a given timeout value (in seconds). - getWorkerArgs(): Return the arguments 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.