Github user StephanEwen commented on a diff in the pull request:

    https://github.com/apache/flink/pull/5645#discussion_r172939401
  
    --- Diff: 
flink-formats/flink-avro/src/main/java/org/apache/flink/formats/avro/typeutils/AvroSerializer.java
 ---
    @@ -163,8 +224,9 @@ public T copy(T from, T reuse) {
     
        @Override
        public void copy(DataInputView source, DataOutputView target) throws 
IOException {
    -           T value = deserialize(source);
    -           serialize(value, target);
    +           // we do not have concurrency checks here, because serialize() 
and
    +           // deserialize() do the checks and the current mechanism does 
not handle
    --- End diff --
    
    oh, right, fixing...


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