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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