Github user CodingCat commented on a diff in the pull request:

    https://github.com/apache/spark/pull/7714#discussion_r35752340
  
    --- Diff: core/src/main/scala/org/apache/spark/deploy/worker/Worker.scala 
---
    @@ -614,6 +585,74 @@ private[worker] class Worker(
         webUi.stop()
         metricsSystem.stop()
       }
    +
    +  private def trimFinishedExecutorsIfNecessary(): Unit = {
    +    if (finishedExecutors.size > retainedExecutors) {
    +      finishedExecutors.take(math.max(finishedExecutors.size / 10, 
1)).foreach {
    +        case (executorId, _) => finishedExecutors.remove(executorId)
    +      }
    +    }
    +  }
    +
    +  private def trimFinishedDriversIfNecessary(): Unit = {
    +    if (finishedDrivers.size > retainedDrivers) {
    +      finishedDrivers.take(math.max(finishedDrivers.size / 10, 1)).foreach 
{
    +        case (driverId, _) => finishedDrivers.remove(driverId)
    +      }
    +    }
    +  }
    +
    +  private[worker] def handleDriverStateChanged(driverStateChanged: 
DriverStateChanged): Unit = {
    --- End diff --
    
    yes, just encapsulate it for easy test


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