Commits on May 6, 2022

1. add lock to cachetools usage …

   * We observed daphne giving tracebacks when accessing logging settings.
     Originally, configure tower in tower settings was no a suspect because
     daphne is not multi-process. We've had issues with configure tower in
     tower settings and multi-process before. We later learned that Daphne
     is multi-threaded. Configure tower in tower was back to being a
     suspect. We constructed a minimal reproducer to show that multiple
     threads accessing settings can cause the same traceback that we saw in
     daphne. See
     https://gist.github.com/chrismeyersfsu/7aa4bdcf76e435efd617cb078c64d413
     for that recreator. These fixes stop the recreation.

   

   chrismeyersfsu authored and rebeccahhh committed May 6, 2022
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