xgboost4j-spark_2.12 1.1.1 API < Back
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# Packages

-  package root
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-  package org
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-  package apache
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-  package spark
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    apache
- SparkParallelismTracker
- TaskFailedListener

c

org.apache.spark

# SparkParallelismTracker 

###

#### class SparkParallelismTracker extends AnyRef

A tracker that ensures enough number of executor cores are alive. Throws an exception when the number of alive cores is less than nWorkers.

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### Instance Constructors

1.  new SparkParallelismTracker(sc: SparkContext, timeout: Long, numWorkers: Int)

   sc

     The SparkContext object

   timeout

     The maximum time to wait for enough number of workers.

   numWorkers

     nWorkers used in an XGBoost Job

### Value Members

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2.  final def ##(): Int
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7.  def equals(arg0: Any): Boolean
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8.  def execute[T](body: ⇒ T): T

   Execute a blocking function call with two checks on enough nWorkers:

   Execute a blocking function call with two checks on enough nWorkers:

   - Before the function starts, wait until there are enough executor cores.
   - During the execution, throws an exception if there is any executor lost.
   T

     Return type

   body

     A blocking function call

   returns

     The return of body

9.  def finalize(): Unit
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15.  final def notifyAll(): Unit
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16.  val sc: SparkContext
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19.  final def wait(): Unit
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