TanYuxin-tyx commented on code in PR #23927:
URL: https://github.com/apache/flink/pull/23927#discussion_r1432220667


##########
flink-runtime/src/main/java/org/apache/flink/runtime/io/network/buffer/Buffer.java:
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@@ -304,7 +306,15 @@ enum DataType {
         RECOVERY_COMPLETION(false, true, true, false, false),
 
         /** {@link #END_OF_SEGMENT} indicates that a segment is finished in a 
subpartition. */
-        END_OF_SEGMENT(false, true, false, false, false);
+        END_OF_SEGMENT(false, true, false, false, false),
+
+        /**
+         * {@link #END_OF_DATA} indicates that there will be no more data 
buffer in a subpartition.
+         */
+        END_OF_DATA(false, true, false, false, false),

Review Comment:
   We already had `EndOfData` and `EndOfPartitionEvent` events, and why not 
reuse them here?



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