Github user janewangfb commented on a diff in the pull request:
https://github.com/apache/spark/pull/18492#discussion_r128339669
--- Diff: core/src/main/java/org/apache/spark/SparkFirehoseListener.java ---
@@ -140,6 +140,16 @@ public void onBlockUpdated(SparkListenerBlockUpdated
blockUpdated) {
}
@Override
+ public void
onSpeculativeTaskSubmitted(SparkListenerSpeculativeTaskSubmitted
speculativeTask) {
+ onEvent(speculativeTask);
+ }
+
+ @Override
+ public void onExtraExecutorNeeded() {
--- End diff --
When there is one executor left but with multiple cpu cores, the task is
running on that executor. But due to locality requirements, speculative jobs
cannot launch on the same host. We will have to request for one extra executor.
Thats is what this event is for.
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