Github user nickva commented on the issue:
https://github.com/apache/couchdb-couch/pull/236
@eiri lru would be used to remove and makes room immediately if we are
bumping against the limit, specifically it would remove non sys db shards
first.
idle-based remove is to clean up memory and processes which are not used
anymore. I think maybe having 1 min is too aggressive and we want a longer time
scale. Or have 2 values for sys_db non-sys dbs. If we scan a shard and never
look at again it remains in a memory forever (the assumption is we'd used it
again) but it is not true.
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