gianm opened a new pull request, #18431:
URL: https://github.com/apache/druid/pull/18431

   DruidMeta owns an executor service, which spawns a thread that retains a 
reference to it. This service must be shut down for the DruidMeta to be 
garbage-collectable, which is important when DruidAvaticaTestDriver is closed. 
Otherwise, any segments retained by the DruidMeta will stick around.
   
   This fix includes a `@LifecycleStop` so the same shutdown happens when an 
actual server is shutting down. It seems like good hygiene.


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