tgravescs commented on code in PR #43627:
URL: https://github.com/apache/spark/pull/43627#discussion_r1394837773


##########
core/src/main/scala/org/apache/spark/SparkEnv.scala:
##########
@@ -415,6 +418,11 @@ object SparkEnv extends Logging {
         advertiseAddress, blockManagerPort, numUsableCores, 
blockManagerMaster.driverEndpoint)
 
     // NB: blockManager is not valid until initialize() is called later.
+    //     SPARK-45762 introduces a change where the ShuffleManager is 
initialized later
+    //     in the SparkContext and Executor, to allow for custom 
ShuffleManagers defined
+    //     in user jars. In the executor, the BlockManager uses a lazy val to 
obtain the
+    //     shuffleManager from the SparkEnv. In the driver, the SparkEnv's 
shuffleManager

Review Comment:
   I think this comment it no longer true. Driver SparkEnv shufflemanager is 
created after the plugin initialized.



##########
core/src/main/scala/org/apache/spark/SparkEnv.scala:
##########
@@ -71,6 +70,12 @@ class SparkEnv (
     val outputCommitCoordinator: OutputCommitCoordinator,
     val conf: SparkConf) extends Logging {
 
+  // We initialize the ShuffleManager later in SparkContext, and Executor, to 
allow

Review Comment:
   ```suggestion
     // We initialize the ShuffleManager later in SparkContext and Executor to 
allow
   ```



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