Error when removing RS(shard)

MongoDB Percona Operator for MongoDB
#1

Hi
I’m trying to remove RS(shard).
I get an error in the operator log:

2022-11-18T10:00:08.108Z	ERROR	controller.psmdb-controller	Reconciler error	{"name": "psmdb-db", "namespace": "psmdb", "error": "check remove posibility for rs rs3: non system db found: saviour", "errorVerbose": "non system db found: saviour\ngithub.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb.(*ReconcilePerconaServerMongoDB).checkIfPossibleToRemove\n\t/go/src/github.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb/psmdb_controller.go:695\ngithub.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb.(*ReconcilePerconaServerMongoDB).Reconcile\n\t/go/src/github.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb/psmdb_controller.go:321\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Reconcile\n\t/go/src/github.com/percona/percona-server-mongodb-operator/vendor/sigs.k8s.io/controller-runtime/pkg/internal/controller/controller.go:114\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).reconcileHandler\n\t/go/src/github.com/percona/percona-server-mongodb-operator/vendor/sigs.k8s.io/controller-runtime/pkg/internal/controller/controller.go:311\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).processNextWorkItem\n\t/go/src/github.com/percona/percona-server-mongodb-operator/vendor/sigs.k8s.io/controller-runtime/pkg/internal/controller/controller.go:266\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Start.func2.2\n\t/go/src/github.com/percona/percona-server-mongodb-operator/vendor/sigs.k8s.io/controller-runtime/pkg/internal/controller/controller.go:227\nruntime.goexit\n\t/usr/local/go/src/runtime/asm_amd64.s:1571\ncheck remove posibility for rs rs3\ngithub.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb.(*ReconcilePerconaServerMongoDB).Reconcile\n\t/go/src/github.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb/psmdb_controller.go:323\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Reconcile\n\t/go/src/github.com/percona/percona-server-mongodb-operator/vendor/sigs.k8s.io/controller-runtime/pkg/internal/controller/controller.go:114\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).reconcileHandler\n\t/go/src/github.com/percona/percona-server-mongodb-operator/vendor/sigs.k8s.io/controller-runtime/pkg/internal/controller/controller.go:311\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).processNextWorkItem\n\t/go/src/github.com/percona/percona-server-mongodb-operator/vendor/sigs.k8s.io/controller-runtime/pkg/internal/controller/controller.go:266\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Start.func2.2\n\t/go/src/github.com/percona/percona-server-mongodb-operator/vendor/sigs.k8s.io/controller-runtime/pkg/internal/controller/controller.go:227\nruntime.goexit\n\t/usr/local/go/src/runtime/asm_amd64.s:1571"}
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).processNextWorkItem
	/go/src/github.com/percona/percona-server-mongodb-operator/vendor/sigs.k8s.io/controller-runtime/pkg/internal/controller/controller.go:266
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Start.func2.2
	/go/src/github.com/percona/percona-server-mongodb-operator/vendor/sigs.k8s.io/controller-runtime/pkg/internal/controller/controller.go:227
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#2

Hello @Sergei_Grigoriev ,

as discussed in another venue: we do not remove the shard if there is a non-system collection present.
The reason is resharding or rebalancing of shards. We just can’t do it automatically with all the variables in play.
So to delete the shard/replica set, please remove all the non-system collections from it.

I created this ticket here to update the docs: [K8SPSMDB-819] Document resharding limitations - Percona JIRA

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