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Lauri Ojansivu
fae1ccd176
The 10.16-10.21 reports of the ferretdb process pegging ~2 cores for a long time
while node sat idle are the signature of an OpLog tail: Meteor holds a tailable
cursor on local.oplog.rs and FerretDB re-scans it server-side. wekan-control
already defaults to polling-only (it clears MONGO_OPLOG_URL), but ferretdb-control
passed --repl-set-name unconditionally, so FerretDB ALWAYS maintained the capped
OpLog (a second write per mutation, a once-a-minute cleanup, and a tailable cursor
for any stray MONGO_OPLOG_URL to spin on) even when WeKan would not tail it.
Gate --repl-set-name on WEKAN_FERRETDB_OPLOG (default false), matching
wekan-control: in the default polling-only mode FerretDB now runs STANDALONE, with
no OpLog at all; the replica set / OpLog is created only when the admin opts in with
wekan-ferretdb-oplog=true. Opting in is now also cheaper on the FerretDB fork side
(the {ts: {$gt}} tail filter is pushed down and the OpLog Timestamp indexed).
Docs: docs/Features/Admin-Panel/Problems/Migrations.md (FerretDB reactivity mode).
Test: tests/ferretdbOplogGating.test.cjs.
Thanks to xet7 !
