davidradl commented on code in PR #27499:
URL: https://github.com/apache/flink/pull/27499#discussion_r2753505778


##########
flink-formats/flink-avro/src/main/java/org/apache/flink/formats/avro/AvroDeserializationSchema.java:
##########
@@ -188,7 +248,17 @@ void checkAvroInitialized() throws IOException {
         if (datumReader != null) {
             return;
         }
-
+        synchronized (this) {
+            if (isFastReaderEnabled()) {
+                String openFlag = System.getProperty(FAST_READER_PROP);
+                if (StringUtils.isEmpty(openFlag)) {
+                    System.setProperty(FAST_READER_PROP, "true");
+                    LOG.info(
+                            "{} are enabled, but FAST_READER_PROP is empty. We 
just change it to true.",

Review Comment:
   I find this message confusing. `if FAST_READER_PROP is empty,` the test 
implies the code changes the system property to true. I suggest 
   
    "{} is enabled, and will be honoured, even though FAST_READER_PROP is 
empty. ",
   
   
   
   
   
   



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