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

["Leanken.Lin (Jira)" <ji...@apache.org>]

Leanken.Lin created SPARK-33016:
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             Summary: 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: 3.0.1
            Reporter: Leanken.Lin


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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