Reynold Xin created SPARK-3031:
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             Summary: Create JsonSerializable and move JSON serialization from 
JsonProtocol into each class
                 Key: SPARK-3031
                 URL: https://issues.apache.org/jira/browse/SPARK-3031
             Project: Spark
          Issue Type: Bug
            Reporter: Reynold Xin


It is really, really weird that we have a single file JsonProtocol that handles 
the JSON serialization/deserialization for a bunch of classes. This is very 
error prone because it is easy to add a new field to a class, and forget to 
update the JSON part of it. Or worse, add a new event class and forget to add 
one, as evidenced by https://issues.apache.org/jira/browse/SPARK-3028



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