pnowojski commented on a change in pull request #6705: [FLINK-10356][network] 
add sanity checks to SpillingAdaptiveSpanningRecordDeserializer
URL: https://github.com/apache/flink/pull/6705#discussion_r250630886
 
 

 ##########
 File path: 
flink-runtime/src/test/java/org/apache/flink/runtime/io/network/api/serialization/SpanningRecordSerializationTest.java
 ##########
 @@ -105,11 +119,235 @@ public void testHandleMixedLargeRecords() throws 
Exception {
                testSerializationRoundTrip(originalRecords, segmentSize);
        }
 
+       /**
+        * Non-spanning, deserialization reads one byte too many and succeeds - 
failure report comes
+        * from an additional check in {@link 
SpillingAdaptiveSpanningRecordDeserializer}.
+        */
+       @Test
+       public void testHandleDeserializingTooMuchNonSpanning1() throws 
Exception {
+               testHandleWrongDeserialization(
+                       DeserializingTooMuch.getValue(),
+                       32 * 1024);
+       }
+
+       /**
+        * Non-spanning, deserialization reads one byte too many and fails.
+        */
+       @Test
+       public void testHandleDeserializingTooMuchNonSpanning2() throws 
Exception {
+               testHandleWrongDeserialization(
+                       DeserializingTooMuch.getValue(),
+                       (serializedLength) -> serializedLength,
+                       isA(IndexOutOfBoundsException.class));
 
 Review comment:
   Why are you codifying a contract that sometimes `IndexOutOfBoundsException` 
is thrown and sometimes `EOFException`?

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