hitratio vs cumulative_hitratio

[davidphilip cherian]

Solr caching : What does it mean have lookup=0, hits=0 and hitratio=0 but
cumulative_hitratio=0.75 and cumulative_lookups >100,000 with
cumulative_inserts >20k and cumulative_evictions =0,  maxSize of cache
objects is 512