rawlinp commented on a change in pull request #6017:
URL: https://github.com/apache/trafficcontrol/pull/6017#discussion_r669068579



##########
File path: docs/source/admin/traffic_ops.rst
##########
@@ -415,6 +415,8 @@ This file deals with the configuration parameters of 
running Traffic Ops itself.
        :log_location_event: This optional field, if specified, should either 
be the location of a file to which event-level output will be logged, or one of 
the special strings ``"stdout"`` which indicates that STDOUT should be used, 
``"stderr"`` which indicates that STDERR should be used or ``"null"`` which 
indicates that no output of this level should be generated. An empty string 
(``""``) and literally ``null`` are equivalent to ``"null"``. Default if not 
specified is ``"null"``.
        :log_location_info: This optional field, if specified, should either be 
the location of a file to which informational-level output will be logged, or 
one of the special strings ``"stdout"`` which indicates that STDOUT should be 
used, ``"stderr"`` which indicates that STDERR should be used or ``"null"`` 
which indicates that no output of this level should be generated. An empty 
string (``""``) and literally ``null`` are equivalent to ``"null"``. Default if 
not specified is ``"null"``.
        :log_location_warning: This optional field, if specified, should either 
be the location of a file to which warning-level output will be logged, or one 
of the special strings ``"stdout"`` which indicates that STDOUT should be used, 
``"stderr"`` which indicates that STDERR should be used or ``"null"`` which 
indicates that no output of this level should be generated. An empty string 
(``""``) and literally ``null`` are equivalent to ``"null"``. Default if not 
specified is ``"null"``.
+       :cache_ms: Milliseconds to cache requests from the database in memory, 
for performance. This should generally be small, values above 5 seconds are 
discouraged. Set 0 to disable the cache. Default if not set is 1000ms.
+       :disable_read_while_writer: Disable read-while-writer functionality. 
Should generally only be set if issues are observed around read-while-write or 
request caching. Default if not set is false.

Review comment:
       Ok, so new features like this should generally be disabled by default 
(if e.g. the cdn.conf is left untouched after upgrading), right?




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