Github user harishreedharan commented on a diff in the pull request:
https://github.com/apache/spark/pull/6508#discussion_r31476465
--- Diff:
core/src/main/scala/org/apache/spark/ExecutorAllocationManager.scala ---
@@ -443,9 +466,27 @@ private[spark] class ExecutorAllocationManager(
private def onExecutorIdle(executorId: String): Unit = synchronized {
if (executorIds.contains(executorId)) {
if (!removeTimes.contains(executorId) &&
!executorsPendingToRemove.contains(executorId)) {
+
+ val hasCachedBlocks =
+ executorsWithCachedBlocks.contains(executorId) ||
+
executorEndpoints.get(executorId).exists(_.askWithRetry[Boolean](HasCachedBlocks))
+
+ if (hasCachedBlocks) executorsWithCachedBlocks += executorId
--- End diff --
@vanzin pinged me offline about having an RPC happening in the listener
thread for each executor being reported idle that can be a huge bottle neck. I
am planning to make all code in this thread asynchronous, and make the maps and
sets used in this thread synchronized, to avoid blocking the listener thread.
Thoughts - @andrewor14, @vanzin ?
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