jerryshao commented on a change in pull request #242: [LIVY-336] Livy should
not spawn one thread per job to track the job on Yarn
URL: https://github.com/apache/incubator-livy/pull/242#discussion_r346099240
##########
File path: server/src/main/scala/org/apache/livy/utils/SparkYarnApp.scala
##########
@@ -122,31 +162,53 @@ class SparkYarnApp private[utils] (
with Logging {
import SparkYarnApp._
+ appList += this
+
private var killed = false
- private val appIdPromise: Promise[ApplicationId] = Promise()
private[utils] var state: SparkApp.State = SparkApp.State.STARTING
private var yarnDiagnostics: IndexedSeq[String] = IndexedSeq.empty[String]
+ private var appInfo = AppInfo()
+ private var appId: Option[ApplicationId] = None
override def log(): IndexedSeq[String] =
("stdout: " +:
process.map(_.inputLines).getOrElse(ArrayBuffer.empty[String])) ++
("\nstderr: " +:
process.map(_.errorLines).getOrElse(ArrayBuffer.empty[String])) ++
("\nYARN Diagnostics: " +: yarnDiagnostics)
+ private def getAppTag = appTag
+
override def kill(): Unit = synchronized {
killed = true
- if (isRunning) {
- try {
- val timeout = SparkYarnApp.getYarnTagToAppIdTimeout(livyConf)
- yarnClient.killApplication(Await.result(appIdPromise.future, timeout))
- } catch {
- // We cannot kill the YARN app without the app id.
- // There's a chance the YARN app hasn't been submitted during a
livy-server failure.
- // We don't want a stuck session that can't be deleted. Emit a warning
and move on.
- case _: TimeoutException | _: InterruptedException =>
- warn("Deleting a session while its YARN application is not found.")
- yarnAppMonitorThread.interrupt()
- } finally {
- process.foreach(_.destroy())
+
+ if (!isRunning) {
+ return
+ }
+
+ process.foreach(_.destroy())
+
+ if (!appId.isEmpty) {
+ yarnClient.killApplication(appId.get)
+ return
+ } else {
+ Future {
Review comment:
`Future` is backed by a thread pool, this will increase the overhead, also
changes the sync semantics to async (potentially introduces some threading
issues).
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