zhouyejoe commented on code in PR #35906:
URL: https://github.com/apache/spark/pull/35906#discussion_r892920621


##########
common/network-yarn/src/main/java/org/apache/spark/network/yarn/YarnShuffleService.java:
##########
@@ -230,11 +241,14 @@ protected void serviceInit(Configuration externalConf) 
throws Exception {
       // when it comes back
       if (_recoveryPath != null) {
         registeredExecutorFile = initRecoveryDb(RECOVERY_FILE_NAME);
+        mergeManagerFile = 
initRecoveryDb(SPARK_SHUFFLE_MERGE_RECOVERY_FILE_NAME);
       }
 
-      TransportConf transportConf = new TransportConf("shuffle", new 
HadoopConfigProvider(_conf));
-      MergedShuffleFileManager shuffleMergeManager = 
newMergedShuffleFileManagerInstance(
-        transportConf);
+      TransportConf transportConf = new TransportConf("shuffle",new 
HadoopConfigProvider(_conf));
+      if (shuffleMergeManager == null) {

Review Comment:
   The main reason is that we have to set the customized MergeShuffleManager, 
and after the set, it shouldn't create the original shuffleMergeManager again 
here. 



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