All,
I propose that we enable RECYCLE_FACADES by default in Tomcat 10.
Reasons:
1. It is "safer"
When running untrusted applications, a malicious application can
potentially spy on others.
Application bugs can cause request/response confusion.
2. It reduces the number of false bug reports
Anytime something odd is happening with an application running on
Tomcat, the application owner usually emails users@ and/or reports a bug
against Tomcat. The first thing we say is "enable RECYCLE_FACADES to be
sure it's not your application".
3. Performance hit is probably minimal
I have no data on this, but I'm assuming that GC isn't an issue at all:
most requests/responses will be created and die all inside of the young
generation (or whatever it's called these days).
I'm not sure how expensive creating a new request/response is. Perhaps
we could look into some targeted performance optimizations in this area.
4. Re-enabling RECYCLE_FACADES is trivial
Just put it in setenv.sh/setenv.bat/catalina.policy
I do not think we should change the default in Tomcat <10 as this might
be a surprise to a lot of users.
-chris
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