nickva commented on issue #5420:
URL: https://github.com/apache/couchdb/issues/5420#issuecomment-2629077847
@jamesaimonetti thanks for reaching out
Backups in the couch_server message queue are often due to frequent opens
and closes, especially when the db handle lru is full and there are not enough
idle handles to replace.
So a few things to try could be:
* Raise the
[max_dbs_open](https://docs.couchdb.org/en/stable/maintenance/performance.html#max-dbs-open)
if memory allows it.
* Disable idle_check_timeout. This setting was later removed
altogether:`[couchdb] idle_check_timeout = infinity`
* Try toggling `update_lru_on_read`: `[couchdb] update_lru_on_read =
false`. If it was set to true, trying setting to false, and vice-versa. It's
kind of dependent on your traffic pattern.
* Increase the number of CPU (schedulers) available if
possible.`couch_server` processes are sharded across the number of available
schedulers. So having 32 schedulers vs 16 would spread the open calls and the
lru across 32 couch_server processes.
* Inspect your logs to see if there is anything timing out or crashing
constantly.
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