LakshSingla commented on code in PR #13062:
URL: https://github.com/apache/druid/pull/13062#discussion_r972603949


##########
extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/shuffle/DurableStorageInputChannelFactory.java:
##########
@@ -112,11 +119,33 @@ public ReadableFrameChannel openChannel(StageId stageId, 
int workerNumber, int p
     catch (Exception e) {
       throw new IOE(
           e,
-          "Could not find remote output of worker task[%s] stage[%d] 
partition[%d]",
-          workerTaskId,
+          "Could not find remote output of worker task[%d] stage[%d] 
partition[%d]",
+          workerNumber,
           stageId.getStageNumber(),
           partitionNumber
       );
     }
   }
+
+  @Nullable
+  public String findSuccessfulPartitionOutput(
+      final String controllerTaskId,
+      final int workerNo,
+      final int stageNumber,
+      final int partitionNumber
+  ) throws IOException
+  {
+    List<String> fileNames = storageConnector.lsFiles(
+        DurableStorageOutputChannelFactory.getPartitionOutputsFolderName(
+            controllerTaskId,
+            workerNo,
+            stageNumber,
+            partitionNumber
+        )
+    );
+    Optional<String> maybeFileName = fileNames.stream()

Review Comment:
   Thinking about it further, even if the order is different, however, the 
content is the same, it shouldn't matter since a single worker is assigned to a 
single partition, right?  



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