executor的状态

spark executor一共有６种状态:

1. launching
2. running
3. killed
4. failed
5. lost
6. exited

一个executor如果处于下列四种状态之一，则executor结束：

1. killed
2. failed
3. lost
4. exited

package org.apache.spark.deploy

private[deploy] object ExecutorState extends Enumeration {

  val LAUNCHING, RUNNING, KILLED, FAILED, LOST, EXITED = Value

  type ExecutorState = Value

  def isFinished(state: ExecutorState): Boolean = Seq(KILLED, FAILED, LOST, EXITED).contains(state)
}