XComp commented on code in PR #23229:
URL: https://github.com/apache/flink/pull/23229#discussion_r1297168003


##########
flink-runtime/src/test/java/org/apache/flink/runtime/rest/MultipartUploadExtension.java:
##########
@@ -119,6 +120,12 @@ public void before(ExtensionContext context) throws 
Exception {
         }
         file2 = TempDirUtils.newFile(tmpDirectory);
         Files.write(file2.toPath(), 
"world".getBytes(ConfigConstants.DEFAULT_CHARSET));
+        file3 = TempDirUtils.newFile(tmpDirectory);
+        try (RandomAccessFile rw = new RandomAccessFile(file3, "rw")) {
+            // magic value that reliably reproduced EndOfDataDecoderException 
in hasNext()
+            rw.setLength(1410);

Review Comment:
   The test doesn't fail if I revert the fix. That makes me believe that this 
magic value doesn't reproduce the scenario reliably. How did you come up with 
the test scenario? :thinking: 



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