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https://issues.apache.org/jira/browse/SPARK-23283?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-23283.
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Resolution: Duplicate
> Probable mistake in hasLaunchedTask condition
> ---------------------------------------------
>
> Key: SPARK-23283
> URL: https://issues.apache.org/jira/browse/SPARK-23283
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 2.2.1
> Reporter: Jakub Dubovsky
> Priority: Minor
>
> In class {code}TaskSchedulerImpl{code} there is a
> [variable|https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/scheduler/TaskSchedulerImpl.scala#L97]
> tracking whether some task was already launched. It is then set to true
> [here|https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/scheduler/TaskSchedulerImpl.scala#L377]
> whenever some task is launched.
> I believe the
> [condition|https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/scheduler/TaskSchedulerImpl.scala#L376]
> should be {code}tasks.map(_.size).sum > 0{code} instead of current
> {code}tasks.size > 0{code}
> Current condition asks whether there are some resource offers while it should
> ask whether there were some launched tasks. In some cases it might happen
> that resources are offered but no tasks launched. In such a case no warning
> is issued.
> Can you confirm this is valid?
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