reswqa commented on code in PR #21122:
URL: https://github.com/apache/flink/pull/21122#discussion_r1002998199


##########
flink-runtime/src/main/java/org/apache/flink/runtime/io/network/partition/hybrid/HsMemoryDataManager.java:
##########
@@ -72,8 +73,8 @@ public class HsMemoryDataManager implements 
HsSpillingInfoProvider, HsMemoryData
 
     private final AtomicInteger numUnSpillBuffers = new AtomicInteger(0);
 
-    private final Map<Integer, HsSubpartitionViewInternalOperations> 
subpartitionViewOperationsMap =
-            new ConcurrentHashMap<>();
+    private final List<Map<Integer, HsSubpartitionViewInternalOperations>>
+            subpartitionViewOperationsMap;

Review Comment:
   Document added.



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