mustafaiman commented on a change in pull request #2123:
URL: https://github.com/apache/hive/pull/2123#discussion_r612782613
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File path:
llap-tez/src/java/org/apache/hadoop/hive/llap/tezplugins/LlapTaskSchedulerService.java
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@@ -429,6 +437,11 @@ public LlapTaskSchedulerService(TaskSchedulerContext
taskSchedulerContext, Clock
delayedTaskSchedulerExecutor =
MoreExecutors.listeningDecorator(delayedTaskSchedulerExecutorRaw);
+ ExecutorService preemptTaskSchedulerExecutorRaw =
Executors.newFixedThreadPool(1,
Review comment:
I checked that too and got confused. LlapTaskScheduler does the work of
finding preemption candidates etc. even though preemption cannot occur in the
end. Also, LlapTaskScheduler marks tasks as preempted and updates preemption
stats eventhough nothing is preempted because of
LLAP_DAEMON_TASK_SCHEDULER_ENABLE_PREEMPTION is false. Am I understanding this
correctly?
This is not the problem of this patch obviously. I am just asking to
understand. I'll +1 this regardless.
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