mridulm commented on code in PR #40307:
URL: https://github.com/apache/spark/pull/40307#discussion_r1127076610


##########
core/src/main/scala/org/apache/spark/ExecutorAllocationManager.scala:
##########
@@ -203,7 +205,8 @@ private[spark] class ExecutorAllocationManager(
       throw new SparkException(
         s"s${DYN_ALLOCATION_SUSTAINED_SCHEDULER_BACKLOG_TIMEOUT.key} must be > 
0!")
     }
-    if (!conf.get(config.SHUFFLE_SERVICE_ENABLED)) {
+    if (!conf.get(config.SHUFFLE_SERVICE_ENABLED) &&
+      !shuffleDriverComponents.supportsReliableStorage()) {

Review Comment:
   `SHUFFLE_SERVICE_ENABLED` will continue to exist for backward compatibility, 
but imo would be specific for the default implementation for SPARK-25299.
   
   That should be better handled as part of a follow up to SPARK-25299 imo.



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