xgboost4j_2.12 1.4.1 API < Back
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# Packages

-  package root
  Definition Classes
    root
-  package ml
  Definition Classes
    root
-  package dmlc
  Definition Classes
    ml
-  package xgboost4j
  Definition Classes
    dmlc
-  package java
  Definition Classes
    xgboost4j
-  package util
  Definition Classes
    java
- Booster
- DMatrix
- ExternalCheckpointManager
- GpuTestSuite
- IEvaluation
- IObjective
- IRabitTracker
- Rabit
- RabitTracker
- TrackerProperties
- XGBoost
- XGBoostError

c

ml.dmlc.xgboost4j.java

# RabitTracker 

###

#### class RabitTracker extends IRabitTracker

Java implementation of the Rabit tracker to coordinate distributed workers. As a wrapper of the Python Rabit tracker, this implementation does not handle timeout for both start() and waitFor() methods (i.e., the timeout is infinite.)

For systems lacking Python environment, or for timeout functionality, consider using the Scala Rabit tracker (ml.dmlc.xgboost4j.scala.rabit.RabitTracker) which does not depend on Python, and provides timeout support.

The tracker must be started on driver node before running distributed jobs.

Linear Supertypes
IRabitTracker, UncaughtExceptionHandler, AnyRef, Any
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Ordering

1. Alphabetic
2. By Inheritance

Inherited

1. RabitTracker
2. IRabitTracker
3. UncaughtExceptionHandler
4. AnyRef
5. Any

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Visibility

1. Public
2. All

### Instance Constructors

1.  new RabitTracker(numWorkers: Int)

### Type Members

1.  type TrackerStatus = IRabitTracker.TrackerStatus
   Attributes
     protected
   Definition Classes
     IRabitTracker

### Value Members

1.  final def !=(arg0: Any): Boolean
   Definition Classes
     AnyRef → Any
2.  final def ##(): Int
   Definition Classes
     AnyRef → Any
3.  final def ==(arg0: Any): Boolean
   Definition Classes
     AnyRef → Any
4.  final def asInstanceOf[T0]: T0
   Definition Classes
     Any
5.  def clone(): AnyRef
   Attributes
     protected[java.lang]
   Definition Classes
     AnyRef
   Annotations
     @native() @throws( ... )
6.  final def eq(arg0: AnyRef): Boolean
   Definition Classes
     AnyRef
7.  def equals(arg0: Any): Boolean
   Definition Classes
     AnyRef → Any
8.  def finalize(): Unit
   Attributes
     protected[java.lang]
   Definition Classes
     AnyRef
   Annotations
     @throws( classOf[java.lang.Throwable] )
9.  final def getClass(): Class[_]
   Definition Classes
     AnyRef → Any
   Annotations
     @native()
10.  def getWorkerEnvs(): Map[String, String]

    Get environments that can be used to pass to worker.

    Get environments that can be used to pass to worker.

    returns

      The environment settings.

    Definition Classes
      RabitTracker → IRabitTracker
11.  def hashCode(): Int
    Definition Classes
      AnyRef → Any
    Annotations
      @native()
12.  final def isInstanceOf[T0]: Boolean
    Definition Classes
      Any
13.  final def ne(arg0: AnyRef): Boolean
    Definition Classes
      AnyRef
14.  final def notify(): Unit
    Definition Classes
      AnyRef
    Annotations
      @native()
15.  final def notifyAll(): Unit
    Definition Classes
      AnyRef
    Annotations
      @native()
16.  def start(timeout: Long): Boolean
    Definition Classes
      RabitTracker → IRabitTracker
17.  def stop(): Unit
    Definition Classes
      RabitTracker → IRabitTracker
18.  final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
      AnyRef
19.  def toString(): String
    Definition Classes
      AnyRef → Any
20.  def uncaughtException(t: Thread, e: Throwable): Unit
    Definition Classes
      RabitTracker → UncaughtExceptionHandler
21.  final def wait(): Unit
    Definition Classes
      AnyRef
    Annotations
      @throws( ... )
22.  final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
      AnyRef
    Annotations
      @throws( ... )
23.  final def wait(arg0: Long): Unit
    Definition Classes
      AnyRef
    Annotations
      @native() @throws( ... )
24.  def waitFor(timeout: Long): Int
    Definition Classes
      RabitTracker → IRabitTracker

### Inherited from IRabitTracker

### Inherited from UncaughtExceptionHandler

### Inherited from AnyRef

### Inherited from Any

### Ungrouped