bbeaudreault commented on PR #4215:
URL: https://github.com/apache/hadoop/pull/4215#issuecomment-1430704163

   > In general sounds fine to me. Do we need an extra validation that the 
class `implements Serialization`?
   
   
   So these serializable classes don't need to implement Serializable 
interface. The only real check we could do is whether 
[`SerializationFactory.getSerialization(class)`](https://github.com/apache/hadoop/blob/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/serializer/SerializationFactory.java#L98-L104)
 returns non-null for the class. Not sure we want to do that. SequenceFile 
already validates that the class has a serialization 
[here](https://github.com/apache/hadoop/blob/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/SequenceFile.java#L2132-L2142).
   


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