[GitHub] [tomcat] markt-asf commented on issue #281: Change FilterChain holder from array to list

[GitBox <gi...@apache.org>]

markt-asf commented on issue #281:
URL: https://github.com/apache/tomcat/pull/281#issuecomment-618447383


   The question is "At what cost?" I have two concerns.
   1. Regressions. The changes should be obvious and easy to check but there are plenty of examples in the history of Tomcat of seemingly simple clean-up triggering unintended regressions. That isn't a reason not to do it but there needs to be a clear benefit - such as reduced lines of code - of making the change.
   2. Performance. I have in the past seen very significant performance drops changing from a simple array to an object (byte[] to ByteBuffer is the case I am thinking of). We need to be very careful of changes that are on the critical path (get executed for all/most requests). In those cases I would want to see repeatable performance numbers that demonstrated the performance cost/benefit of making the change including the impact on garbage generation. `ApplicationFilterChain` falls into this category.


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