replace Update with Patch for setting Pod labels

Closes #24

hack/update-deps.sh

@@ -10,8 +10,8 @@ true >go.mod.bzl
 true >go.sum
 
 # verify and vendor all dependencies
-go mod verify
 go mod tidy -v
+go mod verify
 go mod vendor
 
 # remove all files that were fetched with previous commands in order to avoid conflicts with proto rules

pkg/controller/redis/redis_controller.go

@@ -267,6 +267,7 @@ podIter:
 	for i := range podList.Items {
 		go func(pod corev1.Pod, masterAddress string, wg *sync.WaitGroup) {
 			defer wg.Done()
+			podPatch := client.MergeFrom(pod.DeepCopy())
 			if pod.Status.PodIP == masterAddress {
 				select {
 				case masterChan <- pod.Name:
@@ -285,7 +286,7 @@ podIter:
 				}
 				pod.Labels[roleLabelKey] = replicaLabel
 			}
-			if err := reconciler.client.Update(ctx, &pod); err != nil {
+			if err := reconciler.client.Patch(ctx, &pod, podPatch); err != nil {
 				errChan <- err
 			}
 		}(podList.Items[i], master.Host, &wg)

vendor/modules.txt

@@ -18,6 +18,7 @@ github.com/PuerkitoBio/urlesc
 # github.com/beorn7/perks v1.0.1
 github.com/beorn7/perks/quantile
 # github.com/cenkalti/backoff/v3 v3.0.0
+## explicit
 github.com/cenkalti/backoff/v3
 # github.com/cespare/xxhash/v2 v2.1.1
 github.com/cespare/xxhash/v2
@@ -44,10 +45,12 @@ github.com/go-openapi/jsonpointer
 # github.com/go-openapi/jsonreference v0.19.3
 github.com/go-openapi/jsonreference
 # github.com/go-openapi/spec v0.19.4
+## explicit
 github.com/go-openapi/spec
 # github.com/go-openapi/swag v0.19.5
 github.com/go-openapi/swag
 # github.com/go-redis/redis v6.15.5+incompatible
+## explicit
 github.com/go-redis/redis
 github.com/go-redis/redis/internal
 github.com/go-redis/redis/internal/consistenthash
@@ -106,6 +109,7 @@ github.com/modern-go/concurrent
 # github.com/modern-go/reflect2 v1.0.1
 github.com/modern-go/reflect2
 # github.com/operator-framework/operator-sdk v0.17.1
+## explicit
 github.com/operator-framework/operator-sdk/pkg/k8sutil
 github.com/operator-framework/operator-sdk/pkg/kube-metrics
 github.com/operator-framework/operator-sdk/pkg/leader
@@ -129,8 +133,10 @@ github.com/prometheus/procfs
 github.com/prometheus/procfs/internal/fs
 github.com/prometheus/procfs/internal/util
 # github.com/spf13/cast v1.3.0
+## explicit
 github.com/spf13/cast
 # github.com/spf13/pflag v1.0.5
+## explicit
 github.com/spf13/pflag
 # go.uber.org/atomic v1.6.0
 go.uber.org/atomic
@@ -144,6 +150,7 @@ go.uber.org/zap/internal/color
 go.uber.org/zap/internal/exit
 go.uber.org/zap/zapcore
 # golang.org/x/crypto v0.0.0-20200220183623-bac4c82f6975
+## explicit
 golang.org/x/crypto/argon2
 golang.org/x/crypto/blake2b
 golang.org/x/crypto/ssh/terminal
@@ -192,6 +199,7 @@ gopkg.in/inf.v0
 # gopkg.in/yaml.v2 v2.2.8
 gopkg.in/yaml.v2
 # k8s.io/api v0.17.4
+## explicit
 k8s.io/api/admission/v1beta1
 k8s.io/api/admissionregistration/v1
 k8s.io/api/admissionregistration/v1beta1
@@ -234,6 +242,7 @@ k8s.io/api/storage/v1
 k8s.io/api/storage/v1alpha1
 k8s.io/api/storage/v1beta1
 # k8s.io/apimachinery v0.17.4
+## explicit
 k8s.io/apimachinery/pkg/api/equality
 k8s.io/apimachinery/pkg/api/errors
 k8s.io/apimachinery/pkg/api/meta
@@ -279,6 +288,7 @@ k8s.io/apimachinery/pkg/watch
 k8s.io/apimachinery/third_party/forked/golang/json
 k8s.io/apimachinery/third_party/forked/golang/reflect
 # k8s.io/client-go v12.0.0+incompatible => k8s.io/client-go v0.17.4
+## explicit
 k8s.io/client-go/discovery
 k8s.io/client-go/dynamic
 k8s.io/client-go/kubernetes
@@ -362,6 +372,7 @@ k8s.io/client-go/util/workqueue
 # k8s.io/klog v1.0.0
 k8s.io/klog
 # k8s.io/kube-openapi v0.0.0-20191107075043-30be4d16710a
+## explicit
 k8s.io/kube-openapi/pkg/common
 k8s.io/kube-openapi/pkg/util/proto
 # k8s.io/kube-state-metrics v1.7.2
@@ -373,6 +384,7 @@ k8s.io/utils/integer
 k8s.io/utils/pointer
 k8s.io/utils/trace
 # sigs.k8s.io/controller-runtime v0.5.2
+## explicit
 sigs.k8s.io/controller-runtime/pkg/cache
 sigs.k8s.io/controller-runtime/pkg/cache/internal
 sigs.k8s.io/controller-runtime/pkg/client
@@ -407,3 +419,5 @@ sigs.k8s.io/controller-runtime/pkg/webhook/internal/certwatcher
 sigs.k8s.io/controller-runtime/pkg/webhook/internal/metrics
 # sigs.k8s.io/yaml v1.1.0
 sigs.k8s.io/yaml
+# github.com/Azure/go-autorest => github.com/Azure/go-autorest v13.3.2+incompatible
+# k8s.io/client-go => k8s.io/client-go v0.17.4