sudheerv opened a new pull request #7918:
URL: https://github.com/apache/trafficserver/pull/7918
This change adds stats to track hit rate for each remap rule (based
on their line number/rank in the remap.config file) to allow for such
visibility via a new http endpoint {remap_stats} which returns the
stats in a json format
More Context:
Ordering of remap rules in remap.config in an efficient manner is
very important as it can have a significant impact on performance and
throughput that can be achieved using ATS as a proxy server. For example,
ATS uses a prefix trie to match a forward map rule, but, has to run
through the regex_map rules sequentially. Interleaving regex_map rules
with forward map rules can thus result in unnecessary overhead when
those rules are not overlapping. Further, within regex_map rules, as far
as possible ordering them based on their "hit" rate (decreasing order) can
result in a significant performance improvement.
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