[GitHub] [james-project] chibenwa opened a new pull request #440: [REFACTORING] Cache and reuse Object mappers for writing JMAP responses

Wed, 19 May 2021 00:43:39 -0700 


chibenwa opened a new pull request #440:
URL: https://github.com/apache/james-project/pull/440


   Clients use a close ensemble of properties combination in JMAP responses.
   This enable reuse of jackson assemblies and achieve significant speedup
   of JMAP responses serialisation.
   
   ## Before
   
   ~20% of James applicative CPU time is spent doing JMAP response 
serialization. This is because each request needs a dedicated property filter, 
which is implemented by always initializing a new ObjectMapper, which takes 
time and is sub-optimal as it is not warm.
   
   ![Screenshot from 2021-05-19 
14-27-32](https://user-images.githubusercontent.com/6928740/118773118-b119a400-b8ae-11eb-8d53-dc0720d3193a.png)
   
   Here are the associated gatling run:
   
   ![Screenshot from 2021-05-19 
14-30-29](https://user-images.githubusercontent.com/6928740/118773240-d4445380-b8ae-11eb-9891-22a1efd210b9.png)
   
   ## After
   
   ![Screenshot from 2021-05-19 
14-32-18](https://user-images.githubusercontent.com/6928740/118773465-11a8e100-b8af-11eb-8dcb-07d3531d612a.png)
   
   By caching common serialization patterns we decreased 6 time CPU utilization 
for JMAP Draft response serialization.
   
   Here are the associated gatling run:
   
   ![Screenshot from 2021-05-19 
14-37-50](https://user-images.githubusercontent.com/6928740/118774265-d65ae200-b8af-11eb-82bf-40bb8c4c7e72.png)
   
   
   


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