Commits on Jun 9, 2022

1. carbonserver: introduce file list cache v2 …

   This commit introduces flc v2, the main purpose is to have better quota support during restart.
   Mainly for saving physical and logical size info in the flc.
   
   Users can transparently switch from v1 to v2 and vice versa.
   
   More context on quota friendly: with flc v1, when go-carbon is restarted, it would create a trie index
   tree using the logical size as physical size for metrics and this would potentially temporary high
   physical size accounting and leads to unnecessary throttling if physical size quota is enabled.
   
   With flc v2, go-carbon would keep physical, logical, data points, and first_seen_at timestamp in the
   cache file and use that for rebuilding the trie index after restart. This would avoids temporary incorrect
   physical size accounting issues with flcv1.

   

   bom-d-van committed Jun 9, 2022
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