liuml07 commented on code in PR #25576:
URL: https://github.com/apache/flink/pull/25576#discussion_r1948007803


##########
flink-runtime/src/main/java/org/apache/flink/streaming/api/graph/StreamingJobGraphGenerator.java:
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@@ -1191,6 +1191,12 @@ public static void setOperatorConfig(
                             ? 0 // single input operator
                             : inEdge.getTypeNumber() - 1; // in case of 2 or 
more inputs
 
+            Preconditions.checkState(
+                    inputIndex < inputSerializers.length,
+                    "Input type serializer of vertex '%s' was null or 
undefined for inputIndex %s",

Review Comment:
   Thank you very much, Sujay! That is very helpful feedback, and I have 
updated the patch to address the comments.



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