LuciferYang commented on PR #37999:
URL: https://github.com/apache/spark/pull/37999#issuecomment-1258914643

   In the serial r/w scenario, the benefits are obvious,
   
   - Reading scenario: using singleton is 1800+% faster than creating 
`ObjectMapper ` every time
   - Write scenario: using a single instance is 500+% faster than creating 
`ObjectMapper ` every time


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