Josh Rosen created SPARK-39864:
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Summary: ExecutionListenerManager's registration of the
ExecutionListenerBus should be lazy
Key: SPARK-39864
URL: https://issues.apache.org/jira/browse/SPARK-39864
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 2.0.0
Reporter: Josh Rosen
Assignee: Josh Rosen
Today, ExecutionListenerManager eagerly registers an ExecutionListenerBus
SparkListener when it is created, even if the SparkSession has no query
execution listeners registered. In applications with many short-lived
SparkSessions, this can cause a buildup of empty listeners on the shared
listener bus, increasing Spark listener processing times on the driver.
If we make the registration lazy then we avoid this driver-side listener
performance overhead.
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