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https://issues.apache.org/jira/browse/SPARK-28769?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-28769.
-------------------------------
Fix Version/s: 3.0.0
Resolution: Fixed
Issue resolved by pull request 25487
[https://github.com/apache/spark/pull/25487]
> Improve warning message in Barrier Execution Mode in case required slots >
> maximum slots
> ----------------------------------------------------------------------------------------
>
> Key: SPARK-28769
> URL: https://issues.apache.org/jira/browse/SPARK-28769
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 3.0.0
> Reporter: Kousuke Saruta
> Assignee: Kousuke Saruta
> Priority: Minor
> Fix For: 3.0.0
>
>
> In the current implementation of Barrier Execution Mode, if required slots >
> maximum slots, we get following warning messages.
> {code}
> 19/08/18 15:18:09 WARN DAGScheduler: The job 2 requires to run a barrier
> stage that requires more slots than the total number of slots in the cluster
> currently.
> 19/08/18 15:18:24 WARN DAGScheduler: The job 2 requires to run a barrier
> stage that requires more slots than the total number of slots in the cluster
> currently.
> 19/08/18 15:18:39 WARN DAGScheduler: The job 2 requires to run a barrier
> stage that requires more slots than the total number of slots in the cluster
> currently.
> 19/08/18 15:18:54 WARN DAGScheduler: The job 2 requires to run a barrier
> stage that requires more slots than the total number of slots in the cluster
> currently.
> ...
> {code}
> If we can provide more information, it might help users to decide what they
> should do.
> The following messages are one example.
> {code}
> 19/08/18 16:52:23 WARN DAGScheduler: The job 0 requires to run a barrier
> stage that requires 3 slots than the total number of slots(2) in the cluster
> currently.
> 19/08/18 16:52:38 WARN DAGScheduler: The job 0 requires to run a barrier
> stage that requires 3 slots than the total number of slots(2) in the cluster
> currently (Retry 1/3 failed).
> 19/08/18 16:52:53 WARN DAGScheduler: The job 0 requires to run a barrier
> stage that requires 3 slots than the total number of slots(2) in the cluster
> currently (Retry 2/3 failed).
> 19/08/18 16:53:08 WARN DAGScheduler: The job 0 requires to run a barrier
> stage that requires 3 slots than the total number of slots(2) in the cluster
> currently (Retry 3/3 failed).
> {code}
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