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https://issues.apache.org/jira/browse/SPARK-28005?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16861410#comment-16861410
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Imran Rashid commented on SPARK-28005:
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cc [~cltlfcjin]
> SparkRackResolver should not log for resolving empty list
> ---------------------------------------------------------
>
> Key: SPARK-28005
> URL: https://issues.apache.org/jira/browse/SPARK-28005
> Project: Spark
> Issue Type: Bug
> Components: Scheduler
> Affects Versions: 3.0.0
> Reporter: Imran Rashid
> Priority: Major
>
> After SPARK-13704, {{SparkRackResolver}} generates an INFO message everytime
> is called with 0 arguments:
> https://github.com/apache/spark/blob/master/resource-managers/yarn/src/main/scala/org/apache/spark/deploy/yarn/SparkRackResolver.scala#L73-L76
> That actually happens every 1s when there are no active executors, because of
> the repeated offers that happen as part of delay scheduling:
> https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/scheduler/cluster/CoarseGrainedSchedulerBackend.scala#L134-L139
> while this is relatively benign, its a pretty annoying thing to be logging at
> INFO level every 1 second.
> This is easy to reproduce -- in spark-shell, with dynamic allocation, set log
> level to info, see the logs appear every 1 second. Then run something, see
> the msgs stop. After the executors timeout, see the msgs reappear.
> {noformat}
> scala> :paste
> // Entering paste mode (ctrl-D to finish)
> sc.setLogLevel("info")
> Thread.sleep(5000)
> sc.parallelize(1 to 10).count()
> // Exiting paste mode, now interpreting.
> 19/06/11 12:43:40 INFO yarn.SparkRackResolver: Got an error when resolving
> hostNames. Falling back to /default-rack for all
> 19/06/11 12:43:41 INFO yarn.SparkRackResolver: Got an error when resolving
> hostNames. Falling back to /default-rack for all
> 19/06/11 12:43:42 INFO yarn.SparkRackResolver: Got an error when resolving
> hostNames. Falling back to /default-rack for all
> 19/06/11 12:43:43 INFO yarn.SparkRackResolver: Got an error when resolving
> hostNames. Falling back to /default-rack for all
> 19/06/11 12:43:44 INFO yarn.SparkRackResolver: Got an error when resolving
> hostNames. Falling back to /default-rack for all
> 19/06/11 12:43:45 INFO spark.SparkContext: Starting job: count at <pastie>:28
> 19/06/11 12:43:45 INFO scheduler.DAGScheduler: Got job 0 (count at
> <pastie>:28) with 2 output partitions
> 19/06/11 12:43:45 INFO scheduler.DAGScheduler: Final stage: ResultStage 0
> (count at <pastie>:28)
> ...
> 19/06/11 12:43:54 INFO cluster.YarnScheduler: Removed TaskSet 0.0, whose
> tasks have all completed, from pool
> 19/06/11 12:43:54 INFO scheduler.DAGScheduler: ResultStage 0 (count at
> <pastie>:28) finished in 9.548 s
> 19/06/11 12:43:54 INFO scheduler.DAGScheduler: Job 0 finished: count at
> <pastie>:28, took 9.613049 s
> res2: Long = 10
>
> scala>
> ...
> 19/06/11 12:44:56 INFO yarn.SparkRackResolver: Got an error when resolving
> hostNames. Falling back to /default-rack for all
> 19/06/11 12:44:57 INFO yarn.SparkRackResolver: Got an error when resolving
> hostNames. Falling back to /default-rack for all
> 19/06/11 12:44:58 INFO yarn.SparkRackResolver: Got an error when resolving
> hostNames. Falling back to /default-rack for all
> 19/06/11 12:44:59 INFO yarn.SparkRackResolver: Got an error when resolving
> hostNames. Falling back to /default-rack for all
> ...
> {noformat}
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