dongjoon-hyun commented on code in PR #44173:
URL: https://github.com/apache/spark/pull/44173#discussion_r1415108828


##########
core/src/main/scala/org/apache/spark/deploy/master/RecoveryModeFactory.scala:
##########
@@ -67,6 +67,25 @@ private[master] class FileSystemRecoveryModeFactory(conf: 
SparkConf, serializer:
   }
 }
 
+/**
+ * LeaderAgent in this case is a no-op. Since leader is forever leader as the 
actual
+ * recovery is made by restoring from RocksDB.
+ */
+private[master] class RocksDBRecoveryModeFactory(conf: SparkConf, serializer: 
Serializer)
+  extends StandaloneRecoveryModeFactory(conf, serializer) with Logging {
+
+  val recoveryDir = conf.get(RECOVERY_DIRECTORY)

Review Comment:
   Thank you, @yaooqinn . Ya, that's true. ZookeeperPersistenceEngine has a 
separate configuration namespace for that. That's one of the reasons why I 
don't want to add a new namespace.



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