[jira] [Commented] (SPARK-33016) Potential SQLMetrics missed which might cause WEB UI display issue while AQE is on.

["Apache Spark (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-33016?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17209424#comment-17209424 ] 

Apache Spark commented on SPARK-33016:
--------------------------------------

User 'leanken' has created a pull request for this issue:
https://github.com/apache/spark/pull/29965

> Potential SQLMetrics missed which might cause WEB UI display issue while AQE is on.
> -----------------------------------------------------------------------------------
>
>                 Key: SPARK-33016
>                 URL: https://issues.apache.org/jira/browse/SPARK-33016
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 3.0.0
>            Reporter: Leanken.Lin
>            Priority: Minor
>
> In current AQE execution, there might be a following scenario which might cause SQLMetrics being incorrectly override.
>  # Stage A and B are created, and UI updated thru event onAdaptiveExecutionUpdate.
>  # Stage A and B are running. Subquery in stage A keep updating metrics thru event onAdaptiveSQLMetricUpdate.
>  # Stage B completes, while stage A's subquery is still running, updating metrics.
>  # Completion of stage B triggers new stage creation and UI update thru event onAdaptiveExecutionUpdate again (just like step 1).
>  
> But it's very hard to re-produce this issue, since it was only happened with high concurrency. For the fix, I suggested that we might be able to keep all duplicated metrics instead of updating it every time.



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