[GitHub] spark pull request: SPARK-4337. [YARN] Add ability to cancel pendi...

[andrewor14 <gi...@git.apache.org>]

Github user andrewor14 commented on a diff in the pull request:

    https://github.com/apache/spark/pull/4141#discussion_r24210327
  
    --- Diff: yarn/src/main/scala/org/apache/spark/deploy/yarn/YarnAllocator.scala ---
    @@ -192,15 +186,32 @@ private[yarn] class YarnAllocator(
       }
     
       /**
    -   * Request numExecutors additional containers from YARN. Visible for testing.
    +   * Update the set of container requests that we will sync with the RM based on the number of
    +   * executors we have currently running and our target number of executors.
    +   *
    +   * Visible for testing.
        */
    -  def addResourceRequests(numExecutors: Int): Unit = {
    -    for (i <- 0 until numExecutors) {
    -      val request = new ContainerRequest(resource, null, null, RM_REQUEST_PRIORITY)
    -      amClient.addContainerRequest(request)
    -      val nodes = request.getNodes
    -      val hostStr = if (nodes == null || nodes.isEmpty) "Any" else nodes.last
    -      logInfo("Container request (host: %s, capability: %s".format(hostStr, resource))
    +  def updateResourceRequests(): Unit = {
    +    val numPendingAllocate = getNumPendingAllocate
    +    val missing = targetNumExecutors - numPendingAllocate - numExecutorsRunning
    +
    +    if (missing > 0) {
    +      logInfo(s"Will request $missing executor containers, each with ${resource.getVirtualCores} " +
    +        s"cores and ${resource.getMemory} MB memory including $memoryOverhead MB overhead")
    +
    +      for (i <- 0 until missing) {
    +        val request = new ContainerRequest(resource, null, null, RM_REQUEST_PRIORITY)
    +        amClient.addContainerRequest(request)
    +        val nodes = request.getNodes
    +        val hostStr = if (nodes == null || nodes.isEmpty) "Any" else nodes.last
    +        logInfo("Container request (host: %s, capability: %s)".format(hostStr, resource))
    +      }
    +    } else if (missing < 0) {
    +      val numToCancel = math.min(numPendingAllocate, -missing)
    +      logInfo(s"Canceling requests for ${numToCancel} executor containers")
    --- End diff --
    
    you can just make this `$numToCancel`


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