Github user bryancall commented on the pull request: https://github.com/apache/trafficserver/pull/229#issuecomment-115746373 I think it would be better at the creation of the LogField store the index into the milestone array instead of looking it up every time you log. You can create a MilestoneLogFiled and have LogField as the base class if you don't want add a index to every LogField.
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