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hamishforbes/cache_tags.txt

Created November 28, 2018 09:36
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Ledge Cache Tags notes
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cache_tags.txt
Cache Tags
TODO
housekeeping gracefulness
housekeeping tests
case tests
multi tag tests
unit tests
Tags
tag_id = <http_host>:<tagname>
set of full keys - no ttl
ledge:cache_tag:<http_host>:<tagname>
ledge:cache:<key_spec>#<vary_key>::main
on refresh
determine tag sets from cached response
remove from all tag sets
on save
always sadd - touches tag key
Evicted entries might exist in an old tag set, but house keeping should catch that
and the purge job checks first
Response header: 'Cache-Tags: tag1, tag2'
Housekeeping
Set of all tags in system cache_tag sets to keep track - no ttl
recurring background job to clean up
- Get list of all tag sets
- iterate
- if tag set missing, remove from global set
- iterate over main keys
- if main key missing remove from tag set
- if cached response no logner matches, remove from tag set
sscan sets?
sleep for gracefulness?
Purge cache tag
- Look up tag set
- iterate
- headless purge -- see wildcard purge job
- remove from tag set IF cached response matches current tag set
purge delete - removes from all tag set
purge invalidate - retain for revalidation
purge revalidate - retain for revalidation
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