Github user mridulm commented on a diff in the pull request: https://github.com/apache/spark/pull/16189#discussion_r91258960 --- Diff: core/src/main/scala/org/apache/spark/executor/Executor.scala --- @@ -432,6 +435,57 @@ private[spark] class Executor( } /** + * Supervises the killing / cancellation of a task by sending the interrupted flag, optionally + * sending a Thread.interrupt(), and monitoring the task until it finishes. + */ + private class TaskReaper(taskRunner: TaskRunner, interruptThread: Boolean) extends Runnable { + + private[this] val killPollingFrequencyMs: Long = + conf.getTimeAsMs("spark.task.killPollingFrequency", "10s") + + private[this] val killTimeoutMs: Long = conf.getTimeAsMs("spark.task.killTimeout", "2m") + + private[this] val takeThreadDump: Boolean = + conf.getBoolean("spark.task.threadDumpKilledTasks", true) + + override def run(): Unit = { + val startTimeMs = System.currentTimeMillis() + def elapsedTimeMs = System.currentTimeMillis() - startTimeMs + + while (!taskRunner.isFinished && elapsedTimeMs < killTimeoutMs) { + taskRunner.kill(interruptThread = interruptThread) + taskRunner.synchronized { + Thread.sleep(killPollingFrequencyMs) + } + if (!taskRunner.isFinished) { + logWarning(s"Killed task ${taskRunner.taskId} is still running after $elapsedTimeMs ms") + if (takeThreadDump) { + try { + val threads = Utils.getThreadDump() + threads.find(_.threadName == taskRunner.threadName).foreach { thread => + logWarning(s"Thread dump from task ${taskRunner.taskId}:\n${thread.stackTrace}") --- End diff -- This is expensive only to get to a single thread dump. Why not keep track of thread id, dump only for the single thread (instead of all) and validate threadName is same as expected ?
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