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https://issues.apache.org/jira/browse/SPARK-11296?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Or resolved SPARK-11296.
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Resolution: Duplicate
> FutureAction.onComplete consumes a thread while waiting for job
> ---------------------------------------------------------------
>
> Key: SPARK-11296
> URL: https://issues.apache.org/jira/browse/SPARK-11296
> Project: Spark
> Issue Type: Improvement
> Components: Scheduler, Spark Core
> Affects Versions: 1.4.0, 1.4.1, 1.5.0, 1.5.1
> Reporter: Richard W. Eggert II
> Labels: performance
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> The implementations of the onComplete callback (and, by extension, the
> callbacks based on it) of FutureAction (SimpleFutureAction and
> ComplexFutureAction) each consume a thread that blocks waiting for the
> underlying job(s) to complete. This is unnecessary and is likely to be very
> surprising to anyone accustomed to the usual behavior of Scala Futures (i.e.,
> that callbacks only occupy threads AFTER the underlying task has completed),
> and it runs the risk of causing thread starvation for any processes utilizing
> the same thread pool (especially if scala.concurrent.ExecutionContext.global
> is used). The implementations can and should be reworked to operate in a
> non-blocking manner, by modifying the underlying JobWaiter class to expose a
> non-blocking API, so that the onComplete (as well as onSuccess and onFailure)
> callbacks only utilize threads while they are actually executing.
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