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Fix FerretDB high CPU: never send $changeStream to FerretDB (snap).

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FerretDB v1 does not implement MongoDB change streams. The snap's general
default METEOR_REACTIVITY_ORDER is "changeStreams,oplog,polling", and it
arrives in wekan-control already set, so the FerretDB `:-oplog,polling`
fallback did not apply. Meteor then issued $changeStream aggregates that
FerretDB rejected as "not implemented" thousands of times per second - a
busy-loop that pinned FerretDB CPU (100-390%, 168% seen on 8 cores) and
starved board/card loading, so cards would not open (almost all commands
were those failed aggregates).

For FerretDB, force changeStreams OUT of the reactivity order whatever it
was set to, leaving oplog + polling; real MongoDB is unchanged and keeps
change streams. Polling-disabled path is polling only.

Thanks to xet7 !

Fixes #6492,
Fixes #6493.
This commit is contained in:
Lauri Ojansivu committed 2026-07-20 19:14:08 +03:00
1 parent f79c320d12
commit 383b3dd432
1 file changed
+17 -4
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snap-src/bin/wekan-control
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@@ -110,12 +110,25 @@ if [ "ferretdb" = "${DATABASE}" ]; then
# when OpLog tailing actually works, otherwise polling — so a broken/absent
# OpLog never stops WeKan from starting. Admin Panel / Version ("Reactivity
# mode") shows which one is live.
export METEOR_REACTIVITY_ORDER="${METEOR_REACTIVITY_ORDER:-oplog,polling}"
export DEFAULT_METEOR_REACTIVITY_ORDER="${DEFAULT_METEOR_REACTIVITY_ORDER:-oplog,polling}"
#
# #6492: FerretDB v1 does NOT implement MongoDB change streams. If Meteor is
# told to try `changeStreams` (the snap's general default is
# "changeStreams,oplog,polling", so METEOR_REACTIVITY_ORDER arrives already
# set here and the `:-oplog,polling` fallback would NOT apply), it issues
# $changeStream aggregates that FerretDB rejects as "not implemented" thousands
# of times per second — a busy-loop that pins FerretDB CPU (100–390%) and
# stalls board/card loading. So force `changeStreams` OUT of the order for
# FerretDB, whatever it was set to, leaving oplog + polling.
_reactivity="${METEOR_REACTIVITY_ORDER:-oplog,polling}"
_reactivity="$(printf '%s' "${_reactivity}" | tr ',' '\n' | grep -vixE 'changeStreams?' | tr '\n' ',' | sed 's/,,*/,/g; s/^,//; s/,$//')"
[ -z "${_reactivity}" ] && _reactivity="oplog,polling"
export METEOR_REACTIVITY_ORDER="${_reactivity}"
export DEFAULT_METEOR_REACTIVITY_ORDER="oplog,polling"
echo "FerretDB OpLog enabled (polling fallback): MONGO_OPLOG_URL=${MONGO_OPLOG_URL} METEOR_REACTIVITY_ORDER=${METEOR_REACTIVITY_ORDER}"
else
export METEOR_REACTIVITY_ORDER="${METEOR_REACTIVITY_ORDER:-polling}"
export DEFAULT_METEOR_REACTIVITY_ORDER="${DEFAULT_METEOR_REACTIVITY_ORDER:-polling}"
# Polling only — never change streams (FerretDB does not implement them, #6492).
export METEOR_REACTIVITY_ORDER="polling"
export DEFAULT_METEOR_REACTIVITY_ORDER="polling"
echo "FerretDB OpLog disabled (WEKAN_FERRETDB_OPLOG=false): polling only"
fi
[ -z "${METEOR_POLLING_THROTTLE_MS}" ] && export METEOR_POLLING_THROTTLE_MS=2000