Github user srowen commented on the issue:

    https://github.com/apache/spark/pull/15512
  
    Hm, if the benchmark you give generalizes much that is certainly 
compelling. I guess I'm surprised that instantiating the object can be so 
expensive relative to deserialization since it just happens once per task. 
    
    But it is a fairly simple change. `ThreadLocal` avoids thread safety issues 
though I do wonder if the serializers can hold on to state that would make this 
a source of memory leak?
    
    Maybe ... @squito or @zsxwing has a thought?


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