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Use mutex locks to ensure maxSubscriptions is properly managed: appLocks sync.Map to SubscriptionHandler and a lockApp(appIdHash) helper that lazily creates and acquires a per-application mutex (different apps never block each other). *Note:* Cross-replica caveat & follow-up (not implemented here). The mutex coordinates requests within one pod only. subscriptionServer.replicas is configurable (default 1); with >1 replica, pods can still interleave List/Create and overshoot the limit. Strict cross-replica enforcement would use a per-app distributed lock via a coordination.k8s.io/v1 Lease (capop-sublimit-<appIdHash>): acquire by Get→Create-if-absent / take-if-expired-or-ours via Update with resourceVersion (409-retry), holderIdentity from a POD_NAME env var, leaseDurationSeconds tuned above a single Create but short enough to bound stall on holder crash, release by Update/Delete. This needs leases RBAC added to the subscription-server Role in the cap-operator-lifecycle Helm chart (cross-repo). Recommended interim guidance: run the subscription server with a single replica for strict enforcement.
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Use mutex locks to ensure maxSubscriptions is properly managed:
appLocks sync.Map to SubscriptionHandler and a lockApp(appIdHash) helper
that lazily creates and acquires a per-application mutex (different
apps never block each other).
Note:
Cross-replica caveat & follow-up (not implemented here). The mutex
coordinates requests within one pod only.
subscriptionServer.replicas is configurable (default 1);
with >1 replica, pods can still interleave List/Create and overshoot
the limit. Strict cross-replica enforcement would use a per-app
distributed lock via a coordination.k8s.io/v1 Lease
(capop-sublimit-): acquire by Get→Create-if-absent /
take-if-expired-or-ours via Update with resourceVersion (409-retry),
holderIdentity from a POD_NAME env var, leaseDurationSeconds tuned
above a single Create but short enough to bound stall on holder crash,
release by Update/Delete. This needs leases RBAC added to the
subscription-server Role in the cap-operator-lifecycle Helm chart
(cross-repo).
Recommended interim guidance: run the subscription server with a single
replica for strict enforcement.