shunping commented on code in PR #34623:
URL: https://github.com/apache/beam/pull/34623#discussion_r2043325938


##########
sdks/python/apache_beam/runners/portability/prism_runner.py:
##########
@@ -66,7 +69,12 @@ def default_environment(
     return super().default_environment(options)
 
   def default_job_server(self, options):
-    return job_server.StopOnExitJobServer(PrismJobServer(options))
+    debug_options = options.view_as(pipeline_options.DebugOptions)
+    get_job_server = lambda: job_server.StopOnExitJobServer(
+        PrismJobServer(options))
+    if debug_options.lookup_experiment("enable_prism_server_singleton"):

Review Comment:
   We decided to make it an experiment for the coming release 2.65.0 
(https://github.com/apache/beam/issues/33623#issuecomment-2801641961), so we 
don't introduce breaking change 2 weeks before branch cut and have more time to 
bake in.
   
   After we make prism runner as the default local runner, we can probably 
choose to make singleton the default as well, but this will be upon further 
discussion.



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