diff --git a/common-library/pkg/nexus-compare/compare.go b/common-library/pkg/nexus-compare/compare.go
index a2e99ba51..2a142d1e8 100644
--- a/common-library/pkg/nexus-compare/compare.go
+++ b/common-library/pkg/nexus-compare/compare.go
@@ -17,10 +17,11 @@ import (
 )
 
 const (
-	SpecMatch     = ".*properties\\/spec.*"
-	StatusMatch   = ".*properties\\/status.*"
-	SingletonPath = "/is_singleton"
-	ApiGenPath    = "/nexus-rest-api-gen"
+	SpecMatch      = ".*properties\\/spec.*"
+	StatusMatch    = ".*properties\\/status.*"
+	SingletonPath  = "/is_singleton"
+	ApiGenPath     = "/nexus-rest-api-gen"
+	RequiredString = "required"
 )
 
 func CompareFiles(data1, data2 []byte) (bool, *bytes.Buffer, error) {
@@ -28,7 +29,7 @@ func CompareFiles(data1, data2 []byte) (bool, *bytes.Buffer, error) {
 	headerColor, _ := colorful.Hex("#B9311B")
 	fileColor, _ := colorful.Hex("#088F8F")
 
-	name, err := getSpecName(data1)
+	name, err := GetSpecName(data1)
 	if err != nil {
 		return true, nil, err
 	}
@@ -163,8 +164,10 @@ func filterReport(r *dyff.Report) *dyff.Report {
 	for _, di := range r.Diffs {
 		var ds []dyff.Detail
 		for _, d := range di.Details {
-			if d.From == nil && d.To != nil { // allow to add stuff
-				continue
+			if d.From == nil && d.To != nil && !strings.HasSuffix(di.Path.String(), fmt.Sprintf("/%s", RequiredString)) { // allow to add stuff, but not in required list
+				if len(d.To.Content) == 0 || d.To.Content[0].Value != RequiredString { //allow to add required map field
+					continue
+				}
 			}
 			if di.Path.String() == SingletonPath && d.From.Value == strconv.FormatBool(true) && d.To.Value == strconv.FormatBool(false) { // allow singleton change to false
 				continue
@@ -186,11 +189,11 @@ func filterReport(r *dyff.Report) *dyff.Report {
 }
 
 func getAnnotationReport(data1, data2 []byte) (dyff.Report, error) {
-	aNexus, err := getMapNode(data1, []string{"metadata", "annotations", "nexus"})
+	aNexus, err := GetMapNode(data1, []string{"metadata", "annotations", "nexus"})
 	if err != nil {
 		return dyff.Report{}, err
 	}
-	bNexus, err := getMapNode(data2, []string{"metadata", "annotations", "nexus"})
+	bNexus, err := GetMapNode(data2, []string{"metadata", "annotations", "nexus"})
 	if err != nil {
 		return dyff.Report{}, err
 	}
@@ -246,7 +249,7 @@ func writeTempFile(data []byte) (*os.File, error) {
 	return aFile, err
 }
 
-func getSpecName(data []byte) (string, error) {
+func GetSpecName(data []byte) (string, error) {
 	t := make(map[string]interface{})
 	err := yaml.Unmarshal(data, &t)
 	if err != nil {
@@ -255,7 +258,7 @@ func getSpecName(data []byte) (string, error) {
 	return t["metadata"].(map[string]interface{})["name"].(string), nil
 }
 
-func getMapNode(data []byte, path []string) (interface{}, error) {
+func GetMapNode(data []byte, path []string) (interface{}, error) {
 	var t interface{}
 	var ok bool
 	errPath := "root"
diff --git a/common-library/pkg/nexus-compare/compare_test.go b/common-library/pkg/nexus-compare/compare_test.go
index 83d6b65d7..454055bf2 100644
--- a/common-library/pkg/nexus-compare/compare_test.go
+++ b/common-library/pkg/nexus-compare/compare_test.go
@@ -30,11 +30,18 @@ var _ = Describe("Compare lib tests", func() {
 			Expect(text.String()).Should(ContainSubstring(v))
 		}
 	})
-	It("should return false when adding field", func() {
+	It("should return false and only notice change in required", func() {
 		ans, text, err := CompareFiles([]byte(baseSpec), []byte(addedField))
 		Expect(err).NotTo(HaveOccurred())
-		Expect(ans).To(BeFalse())
-		Expect(text.String()).To(BeEmpty())
+		Expect(ans).To(BeTrue())
+		changeCheck := []string{"/spec/versions/name=v1/schema/openAPIV3Schema/properties/status/properties/nexus/required", "one required field added", "- testaddrequire"}
+		changeCheckNot := []string{"/spec/versions/name=v1/schema/openAPIV3Schema/properties/status/properties/nexus/properties/addedField"}
+		for _, v := range changeCheck {
+			Expect(text.String()).Should(ContainSubstring(v))
+		}
+		for _, v := range changeCheckNot {
+			Expect(text.String()).ShouldNot(ContainSubstring(v))
+		}
 	})
 	It("should report change in nexus annotation", func() {
 		ans, text, err := CompareFiles([]byte(baseSpec), []byte(changeAnnotation))
@@ -59,6 +66,15 @@ var _ = Describe("Compare lib tests", func() {
 			Expect(text.String()).Should(ContainSubstring(v))
 		}
 	})
+	It("it shouldn't filter out added required field", func() {
+		ans, text, err := CompareFiles([]byte(removeRequired), []byte(baseSpec))
+		Expect(err).ToNot(HaveOccurred())
+		Expect(ans).To(BeTrue())
+		changeCheck := []string{"spec changes", "/spec/versions/name=v1/schema/openAPIV3Schema/properties/spec", "one field added", "required", "name"}
+		for _, v := range changeCheck {
+			Expect(text.String()).Should(ContainSubstring(v))
+		}
+	})
 })
 
 var baseSpec = `
@@ -228,6 +244,7 @@ spec:
                   required:
                     - sourceGeneration
                     - remoteGeneration
+                    - testaddrequire
                   type: object
               type: object
           type: object
@@ -919,3 +936,43 @@ status:
   - v1
 
 `
+
+var removeRequired = `
+apiVersion: apiextensions.k8s.io/v1
+kind: CustomResourceDefinition
+metadata:
+  annotations:
+    nexus: |
+      {"name":"gns.IgnoreChild","hierarchy":["roots.root.tsm.tanzu.vmware.com","configs.config.tsm.tanzu.vmware.com","gnses.gns.tsm.tanzu.vmware.com"],"is_singleton":false,"nexus-rest-api-gen":{"uris":null}}
+  creationTimestamp: null
+  name: ignorechilds.gns.tsm.tanzu.vmware.com
+spec:
+  conversion:
+    strategy: None
+  group: gns.tsm.tanzu.vmware.com
+  versions:
+    - name: v1
+      schema:
+        openAPIV3Schema:
+          properties:
+            spec:
+              properties:
+                name:
+                  type: string
+              type: object
+            status:
+              properties:
+                nexus:
+                  properties:
+                    remoteGeneration:
+                      format: int64
+                      type: integer
+                    sourceGeneration:
+                      format: int64
+                      type: integer
+                  required:
+                    - sourceGeneration
+                    - remoteGeneration
+                  type: object
+              type: object
+          type: object`
diff --git a/compiler/Dockerfile b/compiler/Dockerfile
index b32726f26..43522b79e 100644
--- a/compiler/Dockerfile
+++ b/compiler/Dockerfile
@@ -6,7 +6,7 @@ ADD cmd/nexus-openapi-gen /go/bin/nexus-openapi-gen
 ADD cmd/gqlgen /go/bin/gqlgen
 
 WORKDIR /go/src/github.com/vmware-tanzu/graph-framework-for-microservices/compiler
-RUN mv .git .gitmodules kube-openapi gqlgen nexus ..
+RUN mv .git .gitmodules kube-openapi gqlgen nexus install-validator common-library  ..
 RUN git config --global --add safe.directory '*' && git config --global --add url."https://github.com/".insteadOf "git@github.com:"
 RUN make init_submodules
 
@@ -23,4 +23,9 @@ RUN go mod download
 WORKDIR /go/src/github.com/vmware-tanzu/graph-framework-for-microservices/compiler
 RUN go mod download
 
+WORKDIR /go/src/github.com/vmware-tanzu/graph-framework-for-microservices/install-validator
+RUN CGO_ENABLED=0 go build --trimpath -o install.so ./cmd/validate
+
+WORKDIR /go/src/github.com/vmware-tanzu/graph-framework-for-microservices/compiler
+
 CMD make docker.gitlab_credentials && make generate_code
diff --git a/compiler/Makefile b/compiler/Makefile
index ca9b3286c..01303e5d6 100644
--- a/compiler/Makefile
+++ b/compiler/Makefile
@@ -19,6 +19,7 @@ DATAMODEL_PATH ?= datamodel
 CONFIG_FILE ?= ""
 GENERATED_OUTPUT_DIRECTORY ?= generated
 COMPILER_SRC_DIRECTORY ?= ""
+FORCE ?= false
 
 NEXUS_KUBEOPENAPI_VERSION ?= 7416bd4754d3c0dd8b3fa37fff53d36594f11607
 NEXUS_GRAPHQLGEN_VERSION ?= 32f028bce22efeb70b47a640195bd969dbb337f0
@@ -57,9 +58,10 @@ docker.builder:
 	docker build --no-cache -t ${BUILDER_NAME}:${BUILDER_TAG} builder/
 
 .PHONY: docker
-docker: init_submodules ${BUILDER_NAME}\:${BUILDER_TAG}.image.exists build_openapigen_in_container build_gqlgen_in_container
+docker: init_submodules ${BUILDER_NAME}\:${BUILDER_TAG}.image.exists build_openapigen_in_container build_gqlgen_in_container build_install_validator_in_container
 	git archive -o compiler.tar --format=tar HEAD
-	tar -rf compiler.tar ../.git ../.gitmodules ../gqlgen ../kube-openapi ../nexus
+	ls ..
+	tar -rf compiler.tar ../.git ../.gitmodules ../gqlgen ../kube-openapi ../nexus ../install-validator ../common-library
 	docker build --no-cache \
 		--build-arg BUILDER_TAG=${BUILDER_TAG} \
 		-t ${IMAGE_NAME}:${TAG} .
@@ -97,6 +99,12 @@ build_gqlgen_in_container:
 build_gqlgen:
 	GOBIN=${PKG_NAME}/cmd go install ../gqlgen
 
+build_install_validator_in_container:
+	$(call run_in_container,make build_install_validator)
+
+build_install_validator:
+	cd ../install-validator && GOBIN=${PKG_NAME}/cmd go install ./cmd/validate
+
 .PHONY: unit-test
 unit-test:
 	ginkgo -cover ./pkg/...
@@ -149,14 +157,15 @@ generate_code:
 	CRD_MODULE_PATH=${CRD_MODULE_PATH} go run cmd/nexus-sdk/main.go -config-file ${CONFIG_FILE} -dsl ${DATAMODEL_PATH} -crd-output _generated -log-level ${LOG_LEVEL}
 	mv _generated/api_names.sh scripts/
 	@echo "Nexus Compiler: Resolving datamodel dependencies"
-	cd _generated && ../scripts/pin_deps.sh ${COMPILER_SRC_DIRECTORY} && go mod tidy -e
+	cd _generated && ../scripts/pin_deps.sh ${COMPILER_SRC_DIRECTORY} && go mod tidy -e 2>/dev/null
 	@echo "Nexus Compiler: Generating kuberenetes APIs"
 	./scripts/generate_k8s_api.sh
 	@echo "Nexus Compiler: Generating openapi schema"
 	./scripts/generate_openapi_schema.sh
 	@echo "Nexus Compiler: Generating CRD yamls"
-	go run cmd/generate-openapischema/generate-openapischema.go -yamls-path _generated/crds
+	go run cmd/generate-openapischema/generate-openapischema.go -yamls-path _generated/crds -existing-CRDs-Path ${GENERATED_OUTPUT_DIRECTORY}/crds -force ${FORCE}
 	git checkout -- pkg/openapi_generator/openapi/openapi_generated.go
+	rm -rf ${GENERATED_OUTPUT_DIRECTORY}/{client,apis,crds,common,nexus-client,helper,nexus-gql}
 	cp -r _generated/{client,apis,crds,common,nexus-client,helper,nexus-gql} ${GENERATED_OUTPUT_DIRECTORY}
 	@echo "Nexus Compiler: Generating GRAPHQL PKG"
 	cd _generated && goimports -w .
@@ -165,7 +174,7 @@ generate_code:
 	cd ${GOPATH}/src/nexustempmodule && cd nexus-gql && go mod init && \
 	go mod edit -replace nexustempmodule=${GOPATH}/src/nexustempmodule && \
 	${COMPILER_SRC_DIRECTORY}/scripts/pin_graphql_build_version.sh ${COMPILER_SRC_DIRECTORY} && \
-	go mod tidy -e && \
+	go mod tidy -e 2>/dev/null && \
 	CGO_ENABLED=1 GOOS=linux \
 	go build --trimpath -o graphql.so -buildmode=plugin server.go
 	@echo "Updating module name"
@@ -176,6 +185,8 @@ generate_code:
 	@echo "Nexus Compiler: Moving files to output directory"
 	cp -r _generated/{client,apis,crds,common,nexus-client,helper,nexus-gql} ${GENERATED_OUTPUT_DIRECTORY}
 	cp -r ${GOPATH}/src/nexustempmodule/nexus-gql/graphql.so ${GENERATED_OUTPUT_DIRECTORY}/nexus-gql
+	mkdir -p ${GENERATED_OUTPUT_DIRECTORY}/install-validator
+	cp -r ${GOPATH}/src/github.com/vmware-tanzu/graph-framework-for-microservices/install-validator/install.so ${GENERATED_OUTPUT_DIRECTORY}/install-validator/install.so || echo "Could not find install.so file, skipping"
 	@echo "Nexus Compiler: Compiler code generation completed"
 
 .PHONY: test_generate_code_in_container
diff --git a/compiler/cmd/generate-openapischema/generate-openapischema.go b/compiler/cmd/generate-openapischema/generate-openapischema.go
index 9dfe05f37..3492601e2 100644
--- a/compiler/cmd/generate-openapischema/generate-openapischema.go
+++ b/compiler/cmd/generate-openapischema/generate-openapischema.go
@@ -3,6 +3,7 @@ package main
 import (
 	"flag"
 	"fmt"
+	"strconv"
 	"strings"
 
 	generator "github.com/vmware-tanzu/graph-framework-for-microservices/compiler/pkg/openapi_generator"
@@ -11,13 +12,24 @@ import (
 )
 
 func main() {
-	var yamlsPath string
+	var (
+		yamlsPath        string
+		existingCRDsPath string
+		forceUpgrade     string // Used to denote the forced upgrade of a data model.
+	)
 	flag.StringVar(&yamlsPath, "yamls-path", "", "Path to directory containing CRD YAML definitions")
+	flag.StringVar(&existingCRDsPath, "existing-CRDs-Path", "", "Path to directory containing existing CRD YAML definitions")
+	flag.StringVar(&forceUpgrade, "force", "", "Set to true to force the nexus datamodel upgrade. \"+\n\t\t\t\"Defaults to `false`")
 	flag.Parse()
 	if yamlsPath == "" {
 		panic("yamls-path is empty. Run with -h for help")
 	}
 
+	force, err := strconv.ParseBool(forceUpgrade)
+	if err != nil {
+		panic(fmt.Sprintf("invalid flag for nexus datamodel upgrade %v", err))
+	}
+
 	ref := func(pkg string) spec.Ref {
 		r, err := spec.NewRef(strings.ToLower(pkg))
 		if err != nil {
@@ -48,4 +60,8 @@ func main() {
 	if err != nil {
 		panic(err)
 	}
+
+	if err = generator.CheckBackwardCompatibility(existingCRDsPath, yamlsPath, force); err != nil {
+		panic(fmt.Sprintf("Error occurred when checking datamodel compatibility: %v", err))
+	}
 }
diff --git a/compiler/go.mod b/compiler/go.mod
index 04f53fe26..e4dc70936 100644
--- a/compiler/go.mod
+++ b/compiler/go.mod
@@ -7,51 +7,69 @@ require (
 	github.com/ghodss/yaml v1.0.0
 	github.com/gogo/protobuf v1.3.2
 	github.com/onsi/ginkgo v1.16.5
-	github.com/onsi/gomega v1.19.0
+	github.com/onsi/gomega v1.20.2
 	github.com/sirupsen/logrus v1.8.1
+	github.com/vmware-tanzu/graph-framework-for-microservices/common-library v0.0.0-20221129104902-06818e531062
 	github.com/vmware-tanzu/graph-framework-for-microservices/gqlgen v0.0.0-00010101000000-000000000000
 	github.com/vmware-tanzu/graph-framework-for-microservices/kube-openapi v0.0.0-20220603123335-7416bd4754d3
 	github.com/vmware-tanzu/graph-framework-for-microservices/nexus v0.0.0-00010101000000-000000000000
-	golang.org/x/mod v0.6.0-dev.0.20220106191415-9b9b3d81d5e3
-	golang.org/x/text v0.3.7
-	golang.org/x/tools v0.1.10
+	golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4
+	golang.org/x/text v0.3.8
+	golang.org/x/tools v0.1.12
 	k8s.io/apiextensions-apiserver v0.24.0
-	k8s.io/apimachinery v0.24.0
 	k8s.io/gengo v0.0.0-20220307231824-4627b89bbf1b
 )
 
 require (
+	github.com/BurntSushi/toml v1.2.1 // indirect
 	github.com/agnivade/levenshtein v1.1.1 // indirect
 	github.com/cpuguy83/go-md2man/v2 v2.0.1 // indirect
-	github.com/elliotchance/orderedmap v1.4.0 // indirect
 	github.com/emicklei/go-restful v2.15.0+incompatible // indirect
-	github.com/fsnotify/fsnotify v1.5.1 // indirect
+	github.com/fsnotify/fsnotify v1.5.4 // indirect
 	github.com/go-logr/logr v1.2.3 // indirect
 	github.com/go-openapi/jsonpointer v0.19.5 // indirect
 	github.com/go-openapi/jsonreference v0.20.0 // indirect
 	github.com/go-openapi/swag v0.21.1 // indirect
 	github.com/golang/protobuf v1.5.2 // indirect
+	github.com/gonvenience/bunt v1.3.4 // indirect
+	github.com/gonvenience/neat v1.3.11 // indirect
+	github.com/gonvenience/term v1.0.2 // indirect
+	github.com/gonvenience/text v1.0.7 // indirect
+	github.com/gonvenience/wrap v1.1.2 // indirect
+	github.com/gonvenience/ytbx v1.4.4 // indirect
 	github.com/google/gnostic v0.6.9 // indirect
+	github.com/google/go-cmp v0.5.9 // indirect
 	github.com/google/gofuzz v1.2.0 // indirect
+	github.com/homeport/dyff v1.5.6 // indirect
 	github.com/josharian/intern v1.0.0 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/lucasb-eyer/go-colorful v1.2.0 // indirect
 	github.com/mailru/easyjson v0.7.6 // indirect
+	github.com/mattn/go-ciede2000 v0.0.0-20170301095244-782e8c62fec3 // indirect
+	github.com/mattn/go-isatty v0.0.16 // indirect
+	github.com/mitchellh/go-ps v1.0.0 // indirect
+	github.com/mitchellh/hashstructure v1.1.0 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
 	github.com/nxadm/tail v1.4.8 // indirect
 	github.com/russross/blackfriday/v2 v2.1.0 // indirect
+	github.com/sergi/go-diff v1.2.0 // indirect
+	github.com/texttheater/golang-levenshtein v1.0.1 // indirect
 	github.com/urfave/cli/v2 v2.8.1 // indirect
 	github.com/vektah/gqlparser/v2 v2.5.0 // indirect
+	github.com/virtuald/go-ordered-json v0.0.0-20170621173500-b18e6e673d74 // indirect
 	github.com/xrash/smetrics v0.0.0-20201216005158-039620a65673 // indirect
-	golang.org/x/net v0.0.0-20220225172249-27dd8689420f // indirect
-	golang.org/x/sys v0.0.0-20220209214540-3681064d5158 // indirect
-	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
+	golang.org/x/net v0.0.0-20220722155237-a158d28d115b // indirect
+	golang.org/x/sync v0.0.0-20220819030929-7fc1605a5dde // indirect
+	golang.org/x/sys v0.1.0 // indirect
+	golang.org/x/term v0.0.0-20210927222741-03fcf44c2211 // indirect
 	google.golang.org/protobuf v1.28.0 // indirect
 	gopkg.in/check.v1 v1.0.0-20200902074654-038fdea0a05b // indirect
 	gopkg.in/inf.v0 v0.9.1 // indirect
 	gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
+	k8s.io/apimachinery v0.24.0 // indirect
 	k8s.io/klog/v2 v2.60.1 // indirect
 	k8s.io/utils v0.0.0-20220210201930-3a6ce19ff2f9 // indirect
 	sigs.k8s.io/json v0.0.0-20211208200746-9f7c6b3444d2 // indirect
@@ -63,3 +81,5 @@ replace github.com/vmware-tanzu/graph-framework-for-microservices/kube-openapi =
 replace github.com/vmware-tanzu/graph-framework-for-microservices/gqlgen => ../gqlgen
 
 replace github.com/vmware-tanzu/graph-framework-for-microservices/nexus => ../nexus
+
+replace github.com/vmware-tanzu/graph-framework-for-microservices/common-library => ../common-library
diff --git a/compiler/go.sum b/compiler/go.sum
index 5e996eb23..73f81d0b0 100644
--- a/compiler/go.sum
+++ b/compiler/go.sum
@@ -46,7 +46,10 @@ github.com/Azure/go-autorest/autorest/mocks v0.4.1/go.mod h1:LTp+uSrOhSkaKrUy935
 github.com/Azure/go-autorest/logger v0.2.1/go.mod h1:T9E3cAhj2VqvPOtCYAvby9aBXkZmbF5NWuPV8+WeEW8=
 github.com/Azure/go-autorest/tracing v0.6.0/go.mod h1:+vhtPC754Xsa23ID7GlGsrdKBpUA79WCAKPPZVC2DeU=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/BurntSushi/toml v1.0.0/go.mod h1:CxXYINrC8qIiEnFrOxCa7Jy5BFHlXnUU2pbicEuybxQ=
 github.com/BurntSushi/toml v1.1.0/go.mod h1:CxXYINrC8qIiEnFrOxCa7Jy5BFHlXnUU2pbicEuybxQ=
+github.com/BurntSushi/toml v1.2.1 h1:9F2/+DoOYIOksmaJFPw1tGFy1eDnIJXg+UHjuD8lTak=
+github.com/BurntSushi/toml v1.2.1/go.mod h1:CxXYINrC8qIiEnFrOxCa7Jy5BFHlXnUU2pbicEuybxQ=
 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
 github.com/NYTimes/gziphandler v0.0.0-20170623195520-56545f4a5d46/go.mod h1:3wb06e3pkSAbeQ52E9H9iFoQsEEwGN64994WTCIhntQ=
 github.com/NYTimes/gziphandler v1.1.1/go.mod h1:n/CVRwUEOgIxrgPvAQhUUr9oeUtvrhMomdKFjzJNB0c=
@@ -111,6 +114,7 @@ github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f/go.mod h1:E3G3o1h8I7cfc
 github.com/cpuguy83/go-md2man/v2 v2.0.0/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
 github.com/cpuguy83/go-md2man/v2 v2.0.1 h1:r/myEWzV9lfsM1tFLgDyu0atFtJ1fXn261LKYj/3DxU=
 github.com/cpuguy83/go-md2man/v2 v2.0.1/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
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@@ -122,8 +126,7 @@ github.com/dgryski/trifles v0.0.0-20200323201526-dd97f9abfb48/go.mod h1:if7Fbed8
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@@ -147,8 +150,9 @@ github.com/form3tech-oss/jwt-go v3.2.2+incompatible/go.mod h1:pbq4aXjuKjdthFRnoD
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@@ -222,6 +226,24 @@ github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaS
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@@ -241,8 +263,9 @@ github.com/google/go-cmp v0.5.2/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/
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@@ -268,6 +291,7 @@ github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+
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@@ -298,6 +322,8 @@ github.com/hashicorp/logutils v1.0.0/go.mod h1:QIAnNjmIWmVIIkWDTG1z5v++HQmx9WQRO
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@@ -334,24 +360,35 @@ github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
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@@ -437,6 +488,8 @@ github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQD
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@@ -455,6 +508,7 @@ github.com/spf13/afero v1.6.0/go.mod h1:Ai8FlHk4v/PARR026UzYexafAt9roJ7LcLMAmO6Z
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@@ -463,21 +517,31 @@ github.com/spf13/viper v1.7.0/go.mod h1:8WkrPz2fc9jxqZNCJI/76HCieCp4Q8HaLFoCha5q
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@@ -490,6 +554,7 @@ github.com/yuin/goldmark v1.1.32/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9de
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@@ -575,8 +640,9 @@ golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
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@@ -626,9 +692,12 @@ golang.org/x/net v0.0.0-20210805182204-aaa1db679c0d/go.mod h1:9nx3DQGgdP8bBQD5qx
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@@ -653,6 +722,9 @@ golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208/go.mod h1:RxMgew5VJxzue5/jJ
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@@ -678,6 +750,7 @@ golang.org/x/sys v0.0.0-20191204072324-ce4227a45e2e/go.mod h1:h1NjWce9XRLGQEsW7w
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@@ -719,9 +792,18 @@ golang.org/x/sys v0.0.0-20210927094055-39ccf1dd6fa6/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.0.0-20211019181941-9d821ace8654/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20211216021012-1d35b9e2eb4e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220114195835-da31bd327af9/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20220209214540-3681064d5158 h1:rm+CHSpPEEW2IsXUib1ThaHIjuBVZjxNgSKmBLFfD4c=
 golang.org/x/sys v0.0.0-20220209214540-3681064d5158/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220319134239-a9b59b0215f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220412211240-33da011f77ad/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220422013727-9388b58f7150/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.1.0 h1:kunALQeHf1/185U1i0GOB/fy1IPRDDpuoOOqRReG57U=
+golang.org/x/sys v0.1.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/term v0.0.0-20201117132131-f5c789dd3221/go.mod h1:Nr5EML6q2oocZ2LXRh80K7BxOlk5/8JxuGnuhpl+muw=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
+golang.org/x/term v0.0.0-20210927222741-03fcf44c2211 h1:JGgROgKl9N8DuW20oFS5gxc+lE67/N3FcwmBPMe7ArY=
 golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
 golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
@@ -731,8 +813,9 @@ golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.4/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.5/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
-golang.org/x/text v0.3.7 h1:olpwvP2KacW1ZWvsR7uQhoyTYvKAupfQrRGBFM352Gk=
 golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
+golang.org/x/text v0.3.8 h1:nAL+RVCQ9uMn3vJZbV+MRnydTJFPf8qqY42YiA6MrqY=
+golang.org/x/text v0.3.8/go.mod h1:E6s5w1FMmriuDzIBO73fBruAKo1PCIq6d2Q6DHfQ8WQ=
 golang.org/x/time v0.0.0-20181108054448-85acf8d2951c/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20191024005414-555d28b269f0/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
@@ -798,12 +881,12 @@ golang.org/x/tools v0.1.1/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
 golang.org/x/tools v0.1.2/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
 golang.org/x/tools v0.1.5/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
 golang.org/x/tools v0.1.10-0.20220218145154-897bd77cd717/go.mod h1:Uh6Zz+xoGYZom868N8YTex3t7RhtHDBrE8Gzo9bV56E=
-golang.org/x/tools v0.1.10 h1:QjFRCZxdOhBJ/UNgnBZLbNV13DlbnK0quyivTnXJM20=
 golang.org/x/tools v0.1.10/go.mod h1:Uh6Zz+xoGYZom868N8YTex3t7RhtHDBrE8Gzo9bV56E=
+golang.org/x/tools v0.1.12 h1:VveCTK38A2rkS8ZqFY25HIDFscX5X9OoEhJd3quQmXU=
+golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/api v0.4.0/go.mod h1:8k5glujaEP+g9n7WNsDg8QP6cUVNI86fCNMcbazEtwE=
 google.golang.org/api v0.7.0/go.mod h1:WtwebWUNSVBH/HAw79HIFXZNqEvBhG+Ra+ax0hx3E3M=
diff --git a/compiler/pkg/openapi_generator/check-backward-compatibility.go b/compiler/pkg/openapi_generator/check-backward-compatibility.go
new file mode 100644
index 000000000..f98d24d62
--- /dev/null
+++ b/compiler/pkg/openapi_generator/check-backward-compatibility.go
@@ -0,0 +1,142 @@
+package openapi_generator
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/ghodss/yaml"
+	log "github.com/sirupsen/logrus"
+
+	nexus_compare "github.com/vmware-tanzu/graph-framework-for-microservices/common-library/pkg/nexus-compare"
+	extensionsv1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
+)
+
+func splitCRDs(content []byte) []string {
+	return strings.Split(string(content), "---")
+}
+
+func compareCRDs(inCompatibleCRDs []*bytes.Buffer, existingCRDName, existingCRDContent string, newCRDContent []byte) ([]*bytes.Buffer, error) {
+	newCRDParts := splitCRDs(newCRDContent)
+	for _, newCRDPart := range newCRDParts {
+		if newCRDPart == "" {
+			continue
+		}
+
+		newCRD := &extensionsv1.CustomResourceDefinition{}
+		err := yaml.Unmarshal([]byte(newCRDPart), newCRD)
+		if err != nil {
+			return nil, fmt.Errorf("error unmarshaling new CRD: %v", err)
+		}
+
+		if newCRD.Name != existingCRDName {
+			continue
+		}
+
+		// When there is a backward incompatibility, we fail the build if we don't force an upgrade.
+		isInCompatible, message, err := nexus_compare.CompareFiles([]byte(existingCRDContent), []byte(newCRDPart))
+		if err != nil {
+			panic(fmt.Sprintf("Error occurred while checking CRD's %q backward compatibility: %v", existingCRDName, err))
+		}
+		if isInCompatible {
+			log.Warnf("CRD %q is incompatible with the previous version", existingCRDName)
+			inCompatibleCRDs = append(inCompatibleCRDs, message)
+		}
+	}
+	return inCompatibleCRDs, nil
+}
+
+func CheckBackwardCompatibility(existingCRDsPath, yamlsPath string, force bool) error {
+	var (
+		removedCRDs      []string
+		inCompatibleCRDs []*bytes.Buffer
+	)
+
+	if err := filepath.Walk(existingCRDsPath, func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			if errors.Is(err, os.ErrNotExist) {
+				fmt.Printf("No files exists on the path %q: %v", existingCRDsPath, err)
+				return nil
+			}
+			return fmt.Errorf("walking existing CRD files: %v", err)
+		}
+
+		if info.IsDir() {
+			fmt.Printf("Skipping dir %q\n", path)
+			return nil
+		}
+
+		if !strings.HasSuffix(info.Name(), ".yaml") {
+			return nil
+		}
+
+		existingCRDContent, err := os.ReadFile(path)
+		if err != nil {
+			return fmt.Errorf("error reading the existing CRD file on path %q: %v", path, err)
+		}
+
+		/*
+			Find the new CRD for the file with the same name as the existing CRD file and compare it to the new CRD spec provided.
+				existingCRDsPath - indicates the directory path of the existing crd yamls
+					Ex: the path will be `example/output/generated/crds`
+
+				path - indicates the file path of node
+					Ex: For the node `Config` the path will be `example/output/generated/crds/config_config.yaml`
+
+				yamlsPath - indicates the directory path of new crd yamls
+					Ex: the path will be `_generated/crds`
+		*/
+
+		newFilePath := yamlsPath + strings.TrimPrefix(path, existingCRDsPath)
+		newCRDContent, err := os.ReadFile(newFilePath)
+		if err != nil && !errors.Is(err, os.ErrNotExist) {
+			return fmt.Errorf("error reading the crd file on the path %q: %v", newFilePath, err)
+		}
+
+		existingCRDParts := splitCRDs(existingCRDContent)
+		for _, existingCRDPart := range existingCRDParts {
+			if existingCRDPart == "" {
+				continue
+			}
+
+			existingCRD := &extensionsv1.CustomResourceDefinition{}
+			err := yaml.Unmarshal([]byte(existingCRDPart), existingCRD)
+			if err != nil {
+				return fmt.Errorf("error unmarshaling existing CRD: %v", err)
+			}
+
+			// Appears node is removed in the latest version
+			if len(newCRDContent) == 0 {
+				removedCRDs = append(removedCRDs, existingCRD.Name)
+				continue
+			}
+
+			if inCompatibleCRDs, err = compareCRDs(inCompatibleCRDs, existingCRD.Name, existingCRDPart, newCRDContent); err != nil {
+				return err
+			}
+		}
+		return nil
+	}); err != nil {
+		return err
+	}
+
+	if len(inCompatibleCRDs) > 0 || len(removedCRDs) > 0 {
+		inCompatibleCRDsChanges := &bytes.Buffer{}
+		for _, crd := range inCompatibleCRDs {
+			inCompatibleCRDsChanges.Write(crd.Bytes())
+		}
+		for _, crd := range removedCRDs {
+			inCompatibleCRDsChanges.WriteString(fmt.Sprintf("%q is deleted\n", crd))
+		}
+		// If the CRD are incompatible with the previous version, this will fail the build.
+		if !force {
+			return fmt.Errorf("datamodel upgrade failed due to incompatible datamodel changes: \n %v", inCompatibleCRDsChanges)
+		}
+		log.Warnf("Upgrading the data model that is incompatible with the previous version: \n %v", inCompatibleCRDsChanges)
+	}
+
+	return nil
+}
diff --git a/compiler/pkg/openapi_generator/generator_test.go b/compiler/pkg/openapi_generator/generator_test.go
index c09e55161..0c41414f5 100644
--- a/compiler/pkg/openapi_generator/generator_test.go
+++ b/compiler/pkg/openapi_generator/generator_test.go
@@ -1,13 +1,19 @@
 package openapi_generator_test
 
 import (
+	"encoding/json"
 	"fmt"
 	"io/ioutil"
+	"os"
+	"path/filepath"
 	"strings"
 
+	"github.com/ghodss/yaml"
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
+	extensionsv1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
 
+	pkg_generator "github.com/vmware-tanzu/graph-framework-for-microservices/compiler/pkg/generator"
 	generator "github.com/vmware-tanzu/graph-framework-for-microservices/compiler/pkg/openapi_generator"
 	"github.com/vmware-tanzu/graph-framework-for-microservices/compiler/pkg/openapi_generator/test_data/openapi"
 	"github.com/vmware-tanzu/graph-framework-for-microservices/kube-openapi/pkg/common"
@@ -460,4 +466,192 @@ var _ = Describe("Generator", func() {
 		Expect(gen.UpdateYAMLs(tmpDir)).To(Succeed())
 		compareTmpFileWithExpectedFile(tmpFile, "test_data/08_kubernetes_flags.yaml")
 	})
+
+	Context("checks backward compatibility", func() {
+		It("should check for incompatible changes when forcing flag enable/disable between new and existing CRDs", func() {
+			rawDefs := map[string]common.OpenAPIDefinition{
+				getSchemaName("foo"): {
+					Schema: spec.Schema{
+						SchemaProps: spec.SchemaProps{
+							Type: []string{"object"},
+							Properties: map[string]spec.Schema{
+								"spec": {
+									SchemaProps: spec.SchemaProps{
+										Type: []string{"object"},
+										Properties: map[string]spec.Schema{
+											"changePassword": {
+												SchemaProps: spec.SchemaProps{
+													Type:   []string{"string"},
+													Format: "string",
+												},
+											},
+											"name": {
+												SchemaProps: spec.SchemaProps{
+													Type:   []string{"integer"},
+													Format: "int32",
+												},
+											},
+										},
+										Required: []string{"changePassword"},
+									},
+								},
+							},
+						},
+					},
+				},
+			}
+			gen, err := generator.NewGenerator(rawDefs)
+			Expect(err).NotTo(HaveOccurred())
+
+			Expect(gen.ResolveRefs()).To(Succeed())
+
+			// create a new CRD with following changes
+			// removing a required field `password`.
+			// adding a new field `changePassword`
+			// modifying the `name` type from `string` to `int32`
+			tmpFile := fmt.Sprintf("%s/%s.yaml", tmpDir, "foos")
+			err = os.WriteFile(tmpFile, []byte(newFooCRD), 0665)
+			Expect(err).NotTo(HaveOccurred())
+
+			// should fail when change in annotation
+			fooContent, err := os.ReadFile(tmpFile)
+			Expect(err).To(BeNil())
+
+			var crd extensionsv1.CustomResourceDefinition
+			err = yaml.Unmarshal(fooContent, &crd)
+			Expect(err).To(BeNil())
+
+			f, err := os.OpenFile(tmpFile, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0755)
+			Expect(err).To(BeNil())
+
+			ann := crd.Annotations["nexus"]
+			nexusAnnotation := &pkg_generator.NexusAnnotation{}
+			err = json.Unmarshal([]byte(ann), &nexusAnnotation)
+			Expect(err).To(BeNil())
+
+			// modify singleton field to `true` which leads to DM incompatible with previous version
+			nexusAnnotation.IsSingleton = true
+			annotationInByte, err := yaml.Marshal(nexusAnnotation)
+			Expect(err).To(BeNil())
+
+			crd.Annotations["nexus"] = string(annotationInByte)
+			serialized, err := yaml.Marshal(crd)
+			Expect(err).To(BeNil())
+
+			_, err = f.Write(serialized)
+			Expect(err).To(BeNil())
+
+			// should be unsuccessful due to the incompatibility of the new and old CDs + forcing an upgrade=false
+			err = gen.UpdateYAMLs(tmpDir)
+			Expect(err).To(BeNil())
+
+			oldCRDDir, err := exampleFileTempTestDir("foos.yaml")
+			Expect(err).NotTo(HaveOccurred())
+
+			err = generator.CheckBackwardCompatibility(oldCRDDir, tmpDir, false)
+			cleanTempTestDir(oldCRDDir)
+			Expect(err.Error()).To(Equal("datamodel upgrade failed due to incompatible datamodel changes: \n " +
+				"detected changes in model stored in foos\n\n" +
+				"spec changes: \n/spec/versions/name=v1/schema/openAPIV3Schema/properties/spec/properties\n  " +
+				"- one field removed:\n    " +
+				"password:\n      " +
+				"type: string\n      " +
+				"format: string\n    \n  \n\n" +
+				"/spec/versions/name=v1/schema/openAPIV3Schema/properties/spec/properties/name/format\n  " +
+				"± value change\n    " +
+				"- string\n    " +
+				"+ int32\n  \n\n" +
+				"/spec/versions/name=v1/schema/openAPIV3Schema/properties/spec/properties/name/type\n  " +
+				"± value change\n    " +
+				"- string\n    " +
+				"+ integer\n  \n\n" +
+				"/spec/versions/name=v1/schema/openAPIV3Schema/properties/spec/required/0\n  " +
+				"± value change\n    " +
+				"- password\n    " +
+				"+ changePassword\n  \n\n" +
+				"nexus annotation changes: \n/is_singleton\n  ± value change\n    - false\n    + true\n  \n\n"))
+
+			// should fail when CRD is removed in the new list
+			oldCRDDir, err = exampleFileTempTestDir("zoos.yaml")
+			Expect(err).NotTo(HaveOccurred())
+
+			err = generator.CheckBackwardCompatibility(oldCRDDir, tmpDir, false)
+			Expect(err.Error()).To(Equal("datamodel upgrade failed due to incompatible datamodel changes: \n \"foos\" is deleted\n"))
+			cleanTempTestDir(oldCRDDir)
+
+			// shouldn't fail when no crds exists
+			emptyDir, err := exampleTestDir()
+			Expect(err).NotTo(HaveOccurred())
+			err = generator.CheckBackwardCompatibility(emptyDir, tmpDir, false)
+			Expect(err).ToNot(HaveOccurred())
+		})
+	})
 })
+
+func exampleTestDir() (string, error) {
+	dir, err := os.MkdirTemp("", "compatibility-test-")
+	if err != nil {
+		return "", err
+	}
+
+	return dir, nil
+}
+
+func exampleFileTempTestDir(fileName string) (string, error) {
+	dir, err := exampleTestDir()
+	if err != nil {
+		return "", err
+	}
+	data, err := os.ReadFile("test_data/foos.yaml")
+	if err != nil {
+		return "", err
+	}
+
+	file := filepath.Join(dir, fileName)
+	err = os.WriteFile(file, data, 0666)
+	if err != nil {
+		return "", err
+	}
+	return dir, err
+}
+
+func cleanTempTestDir(dir string) {
+	err := os.RemoveAll(dir)
+	if err != nil {
+		fmt.Println(err)
+	}
+}
+
+var newFooCRD = `
+apiVersion: apiextensions.k8s.io/v1
+kind: CustomResourceDefinition
+metadata:
+  annotations:
+    nexus: |
+      {"name":"gns.Foo","hierarchy":["roots.root.tsm.tanzu.vmware.com","configs.config.tsm.tanzu.vmware.com","gnses.gns.tsm.tanzu.vmware.com"],"is_singleton":false,"nexus-rest-api-gen":{"uris":null}}
+  creationTimestamp: null
+  name: foos
+spec:
+  conversion:
+    strategy: None
+  group: test.it
+  names:
+    kind: Foo
+    listKind: FooList
+    plural: foos
+    shortNames:
+    - foo
+    singular: foo
+  scope: Cluster
+  versions:
+  - name: v1
+    served: true
+    storage: true
+status:
+  acceptedNames:
+    kind: ""
+    plural: ""
+  conditions: null
+  storedVersions:
+  - v1
+`
diff --git a/compiler/pkg/openapi_generator/test_data/foos.yaml b/compiler/pkg/openapi_generator/test_data/foos.yaml
new file mode 100644
index 000000000..7cdb750b1
--- /dev/null
+++ b/compiler/pkg/openapi_generator/test_data/foos.yaml
@@ -0,0 +1,49 @@
+---
+apiVersion: apiextensions.k8s.io/v1
+kind: CustomResourceDefinition
+metadata:
+  annotations:
+    nexus: |
+      {"name":"gns.Foo","hierarchy":["roots.root.tsm.tanzu.vmware.com","configs.config.tsm.tanzu.vmware.com","gnses.gns.tsm.tanzu.vmware.com"],"is_singleton":false,"nexus-rest-api-gen":{"uris":null}}
+  creationTimestamp: null
+  name: foos
+spec:
+  conversion:
+    strategy: None
+  group: test.it
+  names:
+    kind: Foo
+    listKind: FooList
+    plural: foos
+    shortNames:
+    - foo
+    singular: foo
+  scope: Cluster
+  versions:
+  - name: v1
+    schema:
+      openAPIV3Schema:
+        properties:
+          metadata:
+            type: object
+          spec:
+            properties:
+              password:
+                format: string
+                type: string
+              name:
+                format: string
+                type: string
+            required:
+            - password
+            type: object
+        type: object
+    served: true
+    storage: true
+status:
+  acceptedNames:
+    kind: ""
+    plural: ""
+  conditions: null
+  storedVersions:
+  - v1
diff --git a/install-validator/Makefile b/install-validator/Makefile
new file mode 100644
index 000000000..2da5e4b15
--- /dev/null
+++ b/install-validator/Makefile
@@ -0,0 +1,23 @@
+.PHONY: race-unit-test
+race-unit-test:
+	ginkgo -race -cover ./pkg/...
+
+.PHONY: test-fmt
+test-fmt:
+	test -z $$(goimports -w -l cmd pkg)
+
+.PHONY: vet
+vet:
+	go vet ./cmd/... ./pkg/...
+
+.PHONY: lint
+lint:
+	golangci-lint run ./cmd/... ./pkg/...
+
+.PHONY: test
+test: test-fmt vet lint race-unit-test
+
+.PHONY: build
+build:
+	cd cmd/validate && \
+		CGO_ENABLED=0 go build -ldflags="-w -s" .
diff --git a/install-validator/README.md b/install-validator/README.md
new file mode 100644
index 000000000..1994d27fd
--- /dev/null
+++ b/install-validator/README.md
@@ -0,0 +1 @@
+# common-library
diff --git a/install-validator/cmd/validate/main.go b/install-validator/cmd/validate/main.go
new file mode 100644
index 000000000..4b5b09069
--- /dev/null
+++ b/install-validator/cmd/validate/main.go
@@ -0,0 +1,55 @@
+package main
+
+import (
+	"os"
+	"strings"
+
+	"github.com/sirupsen/logrus"
+	ext "k8s.io/apiextensions-apiserver/pkg/client/clientset/clientset"
+	"k8s.io/client-go/dynamic"
+
+	nexuscompare "github.com/vmware-tanzu/graph-framework-for-microservices/common-library/pkg/nexus-compare"
+	"github.com/vmware-tanzu/graph-framework-for-microservices/install-validator/pkg/dir"
+	kubewrapper "github.com/vmware-tanzu/graph-framework-for-microservices/install-validator/pkg/k8s-utils"
+)
+
+const (
+	dirEnv        = "CRD_SPEC_DIR"
+	forceEnv      = "FORCE"
+	groupNamePath = "/NAME"
+)
+
+func main() {
+	directory := ""
+	if directory = os.Getenv(dirEnv); directory == "" {
+		directory = "/crds"
+	}
+	force := false
+	if crdForceStr := os.Getenv(forceEnv); strings.ToLower(crdForceStr) == "true" {
+		force = true
+	}
+
+	// setup k8s client
+	config, err := kubewrapper.GetRestConfig()
+	if err != nil {
+		logrus.Fatal(err)
+	}
+	clientset, err := ext.NewForConfig(config)
+	if err != nil {
+		logrus.Fatal(err)
+	}
+	dynamicClient, err := dynamic.NewForConfig(config)
+	if err != nil {
+		logrus.Fatal(err)
+	}
+	c := kubewrapper.Client{Clientset: clientset, DynamicClient: dynamicClient}
+	err = c.FetchGroup(groupNamePath)
+	if err != nil {
+		logrus.Fatal(err)
+	}
+
+	err = dir.ApplyDir(directory, force, &c, nexuscompare.CompareFiles)
+	if err != nil {
+		logrus.Fatal(err)
+	}
+}
diff --git a/install-validator/go.mod b/install-validator/go.mod
new file mode 100644
index 000000000..00801488b
--- /dev/null
+++ b/install-validator/go.mod
@@ -0,0 +1,79 @@
+module github.com/vmware-tanzu/graph-framework-for-microservices/install-validator
+
+go 1.19
+
+require (
+	github.com/golang/mock v1.4.4
+	github.com/onsi/ginkgo v1.16.5
+	github.com/onsi/gomega v1.20.2
+	github.com/sirupsen/logrus v1.8.1
+	github.com/vmware-tanzu/graph-framework-for-microservices/common-library v0.0.0-20221130051552-34fc418458a3
+	k8s.io/apiextensions-apiserver v0.25.4
+	k8s.io/apimachinery v0.25.4
+	k8s.io/client-go v0.25.4
+	sigs.k8s.io/yaml v1.2.0
+)
+
+require (
+	github.com/BurntSushi/toml v1.2.1 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/emicklei/go-restful/v3 v3.8.0 // indirect
+	github.com/evanphx/json-patch v4.12.0+incompatible // indirect
+	github.com/fsnotify/fsnotify v1.5.4 // indirect
+	github.com/go-logr/logr v1.2.3 // indirect
+	github.com/go-openapi/jsonpointer v0.19.5 // indirect
+	github.com/go-openapi/jsonreference v0.20.0 // indirect
+	github.com/go-openapi/swag v0.21.1 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/golang/protobuf v1.5.2 // indirect
+	github.com/gonvenience/bunt v1.3.4 // indirect
+	github.com/gonvenience/neat v1.3.11 // indirect
+	github.com/gonvenience/term v1.0.2 // indirect
+	github.com/gonvenience/text v1.0.7 // indirect
+	github.com/gonvenience/wrap v1.1.2 // indirect
+	github.com/gonvenience/ytbx v1.4.4 // indirect
+	github.com/google/gnostic v0.6.9 // indirect
+	github.com/google/go-cmp v0.5.9 // indirect
+	github.com/google/gofuzz v1.2.0 // indirect
+	github.com/homeport/dyff v1.5.6 // indirect
+	github.com/imdario/mergo v0.3.6 // indirect
+	github.com/josharian/intern v1.0.0 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/lucasb-eyer/go-colorful v1.2.0 // indirect
+	github.com/mailru/easyjson v0.7.6 // indirect
+	github.com/mattn/go-ciede2000 v0.0.0-20170301095244-782e8c62fec3 // indirect
+	github.com/mattn/go-isatty v0.0.16 // indirect
+	github.com/mitchellh/go-ps v1.0.0 // indirect
+	github.com/mitchellh/hashstructure v1.1.0 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
+	github.com/nxadm/tail v1.4.8 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/sergi/go-diff v1.2.0 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+	github.com/texttheater/golang-levenshtein v1.0.1 // indirect
+	github.com/virtuald/go-ordered-json v0.0.0-20170621173500-b18e6e673d74 // indirect
+	golang.org/x/net v0.0.0-20220722155237-a158d28d115b // indirect
+	golang.org/x/oauth2 v0.0.0-20211104180415-d3ed0bb246c8 // indirect
+	golang.org/x/sync v0.0.0-20220819030929-7fc1605a5dde // indirect
+	golang.org/x/sys v0.1.0 // indirect
+	golang.org/x/term v0.0.0-20210927222741-03fcf44c2211 // indirect
+	golang.org/x/text v0.3.8 // indirect
+	golang.org/x/time v0.0.0-20220210224613-90d013bbcef8 // indirect
+	google.golang.org/appengine v1.6.7 // indirect
+	google.golang.org/protobuf v1.28.0 // indirect
+	gopkg.in/check.v1 v1.0.0-20200902074654-038fdea0a05b // indirect
+	gopkg.in/inf.v0 v0.9.1 // indirect
+	gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+	k8s.io/api v0.25.4 // indirect
+	k8s.io/klog/v2 v2.70.1 // indirect
+	k8s.io/kube-openapi v0.0.0-20220803162953-67bda5d908f1 // indirect
+	k8s.io/utils v0.0.0-20220728103510-ee6ede2d64ed // indirect
+	sigs.k8s.io/json v0.0.0-20220713155537-f223a00ba0e2 // indirect
+	sigs.k8s.io/structured-merge-diff/v4 v4.2.3 // indirect
+)
+
+replace github.com/vmware-tanzu/graph-framework-for-microservices/common-library => ../common-library
diff --git a/install-validator/go.sum b/install-validator/go.sum
new file mode 100644
index 000000000..bda318e43
--- /dev/null
+++ b/install-validator/go.sum
@@ -0,0 +1,587 @@
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+k8s.io/klog/v2 v2.70.1/go.mod h1:y1WjHnz7Dj687irZUWR/WLkLc5N1YHtjLdmgWjndZn0=
+k8s.io/kube-openapi v0.0.0-20220803162953-67bda5d908f1 h1:MQ8BAZPZlWk3S9K4a9NCkIFQtZShWqoha7snGixVgEA=
+k8s.io/kube-openapi v0.0.0-20220803162953-67bda5d908f1/go.mod h1:C/N6wCaBHeBHkHUesQOQy2/MZqGgMAFPqGsGQLdbZBU=
+k8s.io/utils v0.0.0-20220728103510-ee6ede2d64ed h1:jAne/RjBTyawwAy0utX5eqigAwz/lQhTmy+Hr/Cpue4=
+k8s.io/utils v0.0.0-20220728103510-ee6ede2d64ed/go.mod h1:jPW/WVKK9YHAvNhRxK0md/EJ228hCsBRufyofKtW8HA=
+rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
+rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
+rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
+sigs.k8s.io/json v0.0.0-20220713155537-f223a00ba0e2 h1:iXTIw73aPyC+oRdyqqvVJuloN1p0AC/kzH07hu3NE+k=
+sigs.k8s.io/json v0.0.0-20220713155537-f223a00ba0e2/go.mod h1:B8JuhiUyNFVKdsE8h686QcCxMaH6HrOAZj4vswFpcB0=
+sigs.k8s.io/structured-merge-diff/v4 v4.2.3 h1:PRbqxJClWWYMNV1dhaG4NsibJbArud9kFxnAMREiWFE=
+sigs.k8s.io/structured-merge-diff/v4 v4.2.3/go.mod h1:qjx8mGObPmV2aSZepjQjbmb2ihdVs8cGKBraizNC69E=
+sigs.k8s.io/yaml v1.2.0 h1:kr/MCeFWJWTwyaHoR9c8EjH9OumOmoF9YGiZd7lFm/Q=
+sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc=
diff --git a/install-validator/pkg/dir/compare.go b/install-validator/pkg/dir/compare.go
new file mode 100644
index 000000000..a9e697d43
--- /dev/null
+++ b/install-validator/pkg/dir/compare.go
@@ -0,0 +1,85 @@
+package dir
+
+import (
+	"bytes"
+	"errors"
+	"os"
+	"path/filepath"
+	"strings"
+
+	nexuscompare "github.com/vmware-tanzu/graph-framework-for-microservices/common-library/pkg/nexus-compare"
+	kubewrapper "github.com/vmware-tanzu/graph-framework-for-microservices/install-validator/pkg/k8s-utils"
+	"sigs.k8s.io/yaml"
+)
+
+type compareFunc func([]byte, []byte) (bool, *bytes.Buffer, error)
+
+func CheckDir(dir string, c kubewrapper.ClientInt, cFunc compareFunc) (map[string]*bytes.Buffer, []string, error) {
+	changes := make(map[string]*bytes.Buffer)
+	var (
+		toDelete  []string
+		toInstall []string
+	)
+	err := filepath.Walk(dir, func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+		if info.IsDir() {
+			return nil
+		}
+		if !strings.HasSuffix(info.Name(), ".yaml") {
+			return nil
+		}
+		newData, err := os.ReadFile(path)
+		if err != nil {
+			return err
+		}
+
+		name, err := nexuscompare.GetSpecName(newData)
+		if err != nil {
+			return err
+		}
+		crd := c.GetCrd(name)
+		toInstall = append(toInstall, name)
+		if crd == nil { //the crd is New, so no incompatible changes
+			return nil
+		}
+
+		if cFunc == nil {
+			return errors.New("nil compare func passed")
+		}
+		actData, err := yaml.Marshal(crd)
+		if err != nil {
+			return err
+		}
+
+		hasAnyIncChanges, incChangesBuffer, err := cFunc(actData, newData)
+		if err != nil {
+			return err
+		}
+
+		if hasAnyIncChanges {
+			changes[name] = incChangesBuffer
+		}
+		return nil
+	})
+
+	if err != nil {
+		return changes, []string{}, err
+	}
+
+	for _, crd := range c.GetCrds() {
+		found := false
+		for _, nameToInstall := range toInstall {
+			if crd.Name == nameToInstall {
+				found = true
+				break
+			}
+		}
+		if !found && strings.HasSuffix(crd.Spec.Group, c.GetGroup()) {
+			toDelete = append(toDelete, crd.Name)
+		}
+	}
+
+	return changes, toDelete, err
+}
diff --git a/install-validator/pkg/dir/install.go b/install-validator/pkg/dir/install.go
new file mode 100644
index 000000000..6c4f1a937
--- /dev/null
+++ b/install-validator/pkg/dir/install.go
@@ -0,0 +1,42 @@
+package dir
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+
+	kubewrapper "github.com/vmware-tanzu/graph-framework-for-microservices/install-validator/pkg/k8s-utils"
+	v1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
+	"sigs.k8s.io/yaml"
+)
+
+func InstallDir(dir string, c kubewrapper.ClientInt) error {
+	err := filepath.Walk(dir, func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+		if info.IsDir() {
+			return nil
+		}
+		if !strings.HasSuffix(info.Name(), ".yaml") {
+			return nil
+		}
+		data, err := os.ReadFile(path)
+		if err != nil {
+			return err
+		}
+
+		var crd v1.CustomResourceDefinition
+		if err := yaml.Unmarshal(data, &crd); err != nil {
+			return err
+		}
+
+		err = c.ApplyCrd(crd)
+		if err != nil {
+			return err
+		}
+		return nil
+	})
+
+	return err
+}
diff --git a/install-validator/pkg/dir/test_dir/grpName b/install-validator/pkg/dir/test_dir/grpName
new file mode 100644
index 000000000..7cffb335b
--- /dev/null
+++ b/install-validator/pkg/dir/test_dir/grpName
@@ -0,0 +1 @@
+tsm.tanzu.vmware.com
diff --git a/install-validator/pkg/dir/test_dir/patt1.yaml b/install-validator/pkg/dir/test_dir/patt1.yaml
new file mode 100644
index 000000000..04ece449d
--- /dev/null
+++ b/install-validator/pkg/dir/test_dir/patt1.yaml
@@ -0,0 +1,32 @@
+apiVersion: apiextensions.k8s.io/v1
+kind: CustomResourceDefinition
+metadata:
+  name: my-crds.com.example
+  annotations:
+    nexus: |
+      {"is_singleton":false,"nexus-rest-api-gen":{"uris":null}}
+spec:
+  group: com.example
+  names:
+    kind: my-crd
+    plural: my-crds
+  scope: Namespaced
+  versions:
+    - name: v1
+      served: true
+      storage: true
+      schema:
+        openAPIV3Schema:
+          type: object
+          properties:
+            apiVersion:
+              type: string
+            kind:
+              type: string
+            metadata:
+              type: object
+            spec:
+              type: object
+              properties:
+                propertyOne:
+                  type: integer
diff --git a/compiler/example/output/generated/crds/config_footype.yaml b/install-validator/pkg/dir/test_dir/root_root_outdated.yaml
similarity index 64%
rename from compiler/example/output/generated/crds/config_footype.yaml
rename to install-validator/pkg/dir/test_dir/root_root_outdated.yaml
index c74e4ac4b..869363310 100644
--- a/compiler/example/output/generated/crds/config_footype.yaml
+++ b/install-validator/pkg/dir/test_dir/root_root_outdated.yaml
@@ -4,20 +4,20 @@ kind: CustomResourceDefinition
 metadata:
   annotations:
     nexus: |
-      {"name":"config.FooType","hierarchy":["roots.root.tsm.tanzu.vmware.com","configs.config.tsm.tanzu.vmware.com"],"is_singleton":false,"nexus-rest-api-gen":{"uris":null}}
+      {"name":"root.Root","children":{"configs.config.tsm.tanzu.vmware.com":{"fieldName":"Config","fieldNameGvk":"configGvk","isNamed":false}},"is_singleton":true,"nexus-rest-api-gen":{"uris":null}}
   creationTimestamp: null
-  name: footypes.config.tsm.tanzu.vmware.com
+  name: roots.outdated.tsm.tanzu.vmware.com
 spec:
   conversion:
     strategy: None
-  group: config.tsm.tanzu.vmware.com
+  group: outdated.tsm.tanzu.vmware.com
   names:
-    kind: FooType
-    listKind: FooTypeList
-    plural: footypes
+    kind: root
+    listKind: rootlist
+    plural: roots
     shortNames:
-    - footype
-    singular: footype
+    - root
+    singular: root
   scope: Cluster
   versions:
   - name: v1
@@ -38,33 +38,19 @@ spec:
             type: object
           spec:
             properties:
-              FooC:
-                format: byte
-                type: integer
-              FooD:
-                format: float
-                type: number
-              fooA:
-                additionalProperties:
-                  type: string
+              configGvk:
+                properties:
+                  group:
+                    type: string
+                  kind:
+                    type: string
+                  name:
+                    type: string
+                required:
+                - group
+                - kind
+                - name
                 type: object
-              fooB:
-                items:
-                  type: string
-                type: array
-              fooE:
-                format: byte
-                type: integer
-              fooF:
-                format: float
-                type: number
-            required:
-            - fooA
-            - fooB
-            - FooC
-            - FooD
-            - fooE
-            - fooF
             type: object
           status:
             properties:
diff --git a/compiler/example/output/generated/crds/gns_emptydata.yaml b/install-validator/pkg/dir/test_dir2/root_root.yaml
similarity index 69%
rename from compiler/example/output/generated/crds/gns_emptydata.yaml
rename to install-validator/pkg/dir/test_dir2/root_root.yaml
index 01bd47517..c8af8cb99 100644
--- a/compiler/example/output/generated/crds/gns_emptydata.yaml
+++ b/install-validator/pkg/dir/test_dir2/root_root.yaml
@@ -4,20 +4,20 @@ kind: CustomResourceDefinition
 metadata:
   annotations:
     nexus: |
-      {"is_singleton":false,"nexus-rest-api-gen":{"uris":null}}
+      {"name":"root.Root","children":{"configs.config.tsm.tanzu.vmware.com":{"fieldName":"Config","fieldNameGvk":"configGvk","isNamed":false}},"is_singleton":true,"nexus-rest-api-gen":{"uris":null}}
   creationTimestamp: null
-  name: emptydatas.gns.tsm.tanzu.vmware.com
+  name: roots.root.tsm.tanzu.vmware.com
 spec:
   conversion:
     strategy: None
-  group: gns.tsm.tanzu.vmware.com
+  group: root.tsm.tanzu.vmware.com
   names:
-    kind: EmptyData
-    listKind: EmptyDataList
-    plural: emptydatas
+    kind: Root
+    listKind: RootList
+    plural: roots
     shortNames:
-    - emptydata
-    singular: emptydata
+    - root
+    singular: root
   scope: Cluster
   versions:
   - name: v1
@@ -36,6 +36,22 @@ spec:
             type: string
           metadata:
             type: object
+          spec:
+            properties:
+              configGvk:
+                properties:
+                  group:
+                    type: string
+                  kind:
+                    type: string
+                  name:
+                    type: string
+                required:
+                - group
+                - kind
+                - name
+                type: object
+            type: object
           status:
             properties:
               nexus:
diff --git a/install-validator/pkg/dir/upgrade.go b/install-validator/pkg/dir/upgrade.go
new file mode 100644
index 000000000..a39a0c496
--- /dev/null
+++ b/install-validator/pkg/dir/upgrade.go
@@ -0,0 +1,71 @@
+package dir
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+
+	"github.com/sirupsen/logrus"
+
+	kubewrapper "github.com/vmware-tanzu/graph-framework-for-microservices/install-validator/pkg/k8s-utils"
+)
+
+// ApplyDir checks if there are any incompatible crds and data for them. Applies them based on force flag.
+func ApplyDir(directory string, force bool, c kubewrapper.ClientInt, cFunc compareFunc) error {
+	err := c.FetchCrds()
+	if err != nil {
+		return err
+	}
+
+	// check for incompatible and outdated models. Return if there are any incompatibilities and force != true
+	inCompatibleCRDs, outdated, err := CheckDir(directory, c, cFunc)
+	if err != nil {
+		return err
+	}
+	if (len(inCompatibleCRDs) > 0 || len(outdated) > 0) && !force {
+		textChanges := new(bytes.Buffer)
+		for _, txt := range inCompatibleCRDs {
+			textChanges.Write(txt.Bytes())
+		}
+		for _, txt := range outdated {
+			textChanges.WriteString(fmt.Sprintf("%s is deleted\n", txt))
+		}
+		logrus.Warn(textChanges)
+		return errors.New("incompatible datamodel changes detected")
+	}
+
+	// check if there are any resources for incompatible crds and return if so
+	var incompatibleAll []string //changed and deleted crds should both be checked
+	for crd := range inCompatibleCRDs {
+		incompatibleAll = append(incompatibleAll, crd)
+	}
+	incompatibleAll = append(incompatibleAll, outdated...)
+	var cr []string
+	for _, crd := range incompatibleAll {
+		res, err := c.ListResources(*c.GetCrd(crd))
+		if err != nil {
+			return err
+		}
+		if len(res) > 0 {
+			cr = append(cr, crd)
+		}
+	}
+	if len(cr) > 0 {
+		return fmt.Errorf("validation failed as objects exists in the system for the incompatibly changed nodes: %v", cr)
+	}
+
+	//delete outdated models
+	for _, o := range outdated {
+		err = c.DeleteCrd(o)
+		if err != nil {
+			return err
+		}
+	}
+
+	// upsert all the models
+	err = InstallDir(directory, c)
+	if err != nil {
+		return err
+	}
+	return nil
+}
diff --git a/install-validator/pkg/dir/upgrade_beh_test.go b/install-validator/pkg/dir/upgrade_beh_test.go
new file mode 100644
index 000000000..38223998b
--- /dev/null
+++ b/install-validator/pkg/dir/upgrade_beh_test.go
@@ -0,0 +1,114 @@
+package dir
+
+import (
+	"context"
+	"os"
+
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
+
+	"k8s.io/apimachinery/pkg/runtime/schema"
+
+	"k8s.io/apimachinery/pkg/runtime"
+
+	nexus_compare "github.com/vmware-tanzu/graph-framework-for-microservices/common-library/pkg/nexus-compare"
+
+	v1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
+	"k8s.io/apimachinery/pkg/util/yaml"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+	kubewrapper "github.com/vmware-tanzu/graph-framework-for-microservices/install-validator/pkg/k8s-utils"
+	"k8s.io/apiextensions-apiserver/pkg/client/clientset/clientset/fake"
+	dynamicfake "k8s.io/client-go/dynamic/fake"
+)
+
+var _ = Describe("Generator", func() {
+
+	ff := fake.NewSimpleClientset()
+	groupRes := schema.GroupVersionResource{
+		Group:    "outdated.tsm.tanzu.vmware.com",
+		Version:  "v1",
+		Resource: "roots",
+	}
+	dyn := dynamicfake.NewSimpleDynamicClientWithCustomListKinds(runtime.NewScheme(), map[schema.GroupVersionResource]string{
+		groupRes: "mycrdsList",
+	})
+
+	c := kubewrapper.Client{Clientset: ff, DynamicClient: dyn}
+	c.Clientset.ApiextensionsV1()
+
+	It("apply crds to empty cluster", func() {
+		err := ApplyDir("./test_dir", false, &c, getNoDiff)
+		Expect(err).To(Not(HaveOccurred()))
+		err = c.FetchCrds()
+		Expect(err).To(Not(HaveOccurred()))
+		crd := c.GetCrd("my-crds.com.example")
+		Expect(crd).ToNot(BeNil())
+	})
+	It("return err if changes and force=false", func() {
+		patt1f, err := os.ReadFile("./test_dir/patt1.yaml")
+		Expect(err).To(Not(HaveOccurred()))
+		var patt1 v1.CustomResourceDefinition
+		err = yaml.Unmarshal(patt1f, &patt1)
+		Expect(err).To(Not(HaveOccurred()))
+		patt1.Spec.Versions[0].Schema.OpenAPIV3Schema.Properties["spec"].Properties["propertyOne"] = v1.JSONSchemaProps{Type: "string"}
+		err = c.ApplyCrd(patt1)
+		Expect(err).To(Not(HaveOccurred()))
+
+		err = ApplyDir("./test_dir", false, &c, nexus_compare.CompareFiles)
+		Expect(err).To(HaveOccurred())
+	})
+	It("return delete outdated model but leave the one with other group", func() {
+		patt1f, err := os.ReadFile("./test_dir/patt1.yaml")
+		Expect(err).To(Not(HaveOccurred()))
+		var patt1 v1.CustomResourceDefinition
+		err = yaml.Unmarshal(patt1f, &patt1)
+		Expect(err).To(Not(HaveOccurred()))
+		err = c.ApplyCrd(patt1)
+		Expect(err).To(Not(HaveOccurred()))
+
+		rootO, err := os.ReadFile("./test_dir/root_root_outdated.yaml")
+		Expect(err).To(Not(HaveOccurred()))
+		var root v1.CustomResourceDefinition
+		err = yaml.Unmarshal(rootO, &root)
+		Expect(err).To(Not(HaveOccurred()))
+		err = c.ApplyCrd(root)
+		Expect(err).To(Not(HaveOccurred()))
+
+		err = c.FetchGroup("./test_dir/grpName")
+		Expect(err).To(Not(HaveOccurred()))
+
+		err = ApplyDir("./test_dir2", true, &c, nexus_compare.CompareFiles)
+		Expect(err).To(Not(HaveOccurred()))
+
+		err = c.FetchCrds()
+		Expect(err).To(Not(HaveOccurred()))
+
+		crd := c.GetCrd(patt1.Name)
+		Expect(crd).ToNot(BeNil())
+
+		crdRoot := c.GetCrd(root.Name)
+		Expect(crdRoot).To(BeNil())
+
+	})
+	It("should fail if there exist any resource in crd that is outdated", func() {
+		_, err := c.DynamicClient.Resource(groupRes).Create(context.TODO(), &unstructured.Unstructured{}, metav1.CreateOptions{})
+		Expect(err).To(Not(HaveOccurred()))
+
+		rootO, err := os.ReadFile("./test_dir/root_root_outdated.yaml")
+		Expect(err).To(Not(HaveOccurred()))
+		var root v1.CustomResourceDefinition
+		err = yaml.Unmarshal(rootO, &root)
+		Expect(err).To(Not(HaveOccurred()))
+		err = c.ApplyCrd(root)
+		Expect(err).To(Not(HaveOccurred()))
+
+		err = c.FetchGroup("./test_dir/grpName")
+		Expect(err).To(Not(HaveOccurred()))
+
+		err = ApplyDir("./test_dir2", true, &c, nexus_compare.CompareFiles)
+		Expect(err).To(HaveOccurred())
+	})
+
+})
diff --git a/install-validator/pkg/dir/upgrade_suite_test.go b/install-validator/pkg/dir/upgrade_suite_test.go
new file mode 100644
index 000000000..72382e6c8
--- /dev/null
+++ b/install-validator/pkg/dir/upgrade_suite_test.go
@@ -0,0 +1,13 @@
+package dir
+
+import (
+	"testing"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+func TestGenerator(t *testing.T) {
+	RegisterFailHandler(Fail)
+	RunSpecs(t, "Upgrade Suite")
+}
diff --git a/install-validator/pkg/dir/upgrade_test.go b/install-validator/pkg/dir/upgrade_test.go
new file mode 100644
index 000000000..0a008f338
--- /dev/null
+++ b/install-validator/pkg/dir/upgrade_test.go
@@ -0,0 +1,130 @@
+package dir
+
+import (
+	"bytes"
+	"os"
+	"testing"
+
+	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
+
+	"github.com/golang/mock/gomock"
+	kubewrapper "github.com/vmware-tanzu/graph-framework-for-microservices/install-validator/pkg/k8s-utils"
+	mockkubernetes "github.com/vmware-tanzu/graph-framework-for-microservices/install-validator/pkg/k8s-utils/mocks"
+	v1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
+	"k8s.io/apimachinery/pkg/util/yaml"
+)
+
+func TestApplyDir(t *testing.T) {
+	type args struct {
+		directory string
+		force     bool
+		c         kubewrapper.ClientInt
+		cFunc     compareFunc
+	}
+	ctrl := gomock.NewController(t)
+	cc := mockkubernetes.NewMockClientInt(ctrl)
+
+	patt1f, err := os.ReadFile("./test_dir/patt1.yaml")
+	if err != nil {
+		t.Fatal("error while init", err)
+	}
+	rootf, _ := os.ReadFile("./test_dir2/root_root.yaml")
+	if err != nil {
+		t.Fatal("error while init", err)
+	}
+	rootOutdatedf, _ := os.ReadFile("./test_dir/root_root_outdated.yaml")
+	if err != nil {
+		t.Fatal("error while init", err)
+	}
+	var patt1 v1.CustomResourceDefinition
+	var rootRoot v1.CustomResourceDefinition
+	var rootOutdated v1.CustomResourceDefinition
+	err = yaml.Unmarshal(patt1f, &patt1)
+	if err != nil {
+		t.Fatal("error while init", err)
+	}
+	err = yaml.Unmarshal(rootf, &rootRoot)
+	if err != nil {
+		t.Fatal("error while init", err)
+	}
+	err = yaml.Unmarshal(rootOutdatedf, &rootOutdated)
+	if err != nil {
+		t.Fatal("error while init", err)
+	}
+
+	cc.EXPECT().FetchCrds().Return(nil).AnyTimes()
+
+	cc.EXPECT().ApplyCrd(patt1).Return(nil).AnyTimes()
+	cc.EXPECT().ApplyCrd(rootRoot).Return(nil).AnyTimes()
+	cc.EXPECT().ApplyCrd(rootOutdated).Return(nil).AnyTimes()
+
+	cc.EXPECT().GetCrd("my-crds.com.example").Return(&patt1).AnyTimes()
+	cc.EXPECT().GetCrd("roots.outdated.tsm.tanzu.vmware.com").Return(&patt1).AnyTimes()
+	cc.EXPECT().GetCrd("roots.root.tsm.tanzu.vmware.com").Return(&rootRoot).AnyTimes()
+
+	cc.EXPECT().ListResources(patt1).Return([]unstructured.Unstructured{{Object: map[string]interface{}{}}}, nil).AnyTimes()
+	cc.EXPECT().ListResources(rootRoot).Return([]unstructured.Unstructured{}, nil).AnyTimes()
+
+	cc.EXPECT().GetCrds().Return([]v1.CustomResourceDefinition{}).AnyTimes()
+
+	tests := []struct {
+		name    string
+		args    args
+		wantErr bool
+	}{
+		{
+			name: "all new data",
+			args: args{
+				directory: "./test_dir",
+				force:     false,
+				c:         cc,
+				cFunc:     getNoDiff,
+			},
+			wantErr: false,
+		},
+		{
+			name: "diffs no force",
+			args: args{
+				directory: "./test_dir",
+				force:     false,
+				c:         cc,
+				cFunc:     AnyDiffs,
+			},
+			wantErr: true,
+		},
+		{
+			name: "diffs force, data exist",
+			args: args{
+				directory: "./test_dir",
+				force:     true,
+				c:         cc,
+				cFunc:     AnyDiffs,
+			},
+			wantErr: true,
+		},
+		{
+			name: "diffs force, no data",
+			args: args{
+				directory: "./test_dir2",
+				force:     true,
+				c:         cc,
+				cFunc:     AnyDiffs,
+			},
+			wantErr: false,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if err := ApplyDir(tt.args.directory, tt.args.force, tt.args.c, tt.args.cFunc); (err != nil) != tt.wantErr {
+				t.Errorf("ApplyDir() error = %v, wantErr %v", err, tt.wantErr)
+			}
+		})
+	}
+}
+
+func getNoDiff(_ []byte, _ []byte) (bool, *bytes.Buffer, error) {
+	return false, nil, nil
+}
+func AnyDiffs(_ []byte, _ []byte) (bool, *bytes.Buffer, error) {
+	return true, bytes.NewBuffer(nil), nil
+}
diff --git a/install-validator/pkg/k8s-utils/client.go b/install-validator/pkg/k8s-utils/client.go
new file mode 100644
index 000000000..467b0f32a
--- /dev/null
+++ b/install-validator/pkg/k8s-utils/client.go
@@ -0,0 +1,118 @@
+package k8s_utils
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"strings"
+
+	"k8s.io/client-go/rest"
+	"k8s.io/client-go/tools/clientcmd"
+
+	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
+
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/client-go/dynamic"
+
+	v1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
+	ext "k8s.io/apiextensions-apiserver/pkg/client/clientset/clientset"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+type ClientInt interface {
+	ApplyCrd(crd v1.CustomResourceDefinition) error
+	DeleteCrd(name string) error
+	FetchCrds() error
+	GetCrds() []v1.CustomResourceDefinition
+	GetGroup() string
+	GetCrd(name string) *v1.CustomResourceDefinition
+	ListResources(crd v1.CustomResourceDefinition) ([]unstructured.Unstructured, error)
+	FetchGroup(groupPath string) error
+}
+
+type Client struct {
+	Clientset     ext.Interface
+	DynamicClient dynamic.Interface
+	crds          []v1.CustomResourceDefinition
+	group         string
+}
+
+func (c *Client) GetCrd(name string) *v1.CustomResourceDefinition {
+	for _, s := range c.crds {
+		if s.Name == name {
+			return &s
+		}
+	}
+	return nil
+}
+
+func (c *Client) GetCrds() []v1.CustomResourceDefinition {
+	return c.crds
+}
+
+func (c *Client) GetGroup() string {
+	return c.group
+}
+
+func (c *Client) DeleteCrd(name string) error {
+	return c.Clientset.ApiextensionsV1().CustomResourceDefinitions().Delete(context.TODO(), name, metav1.DeleteOptions{})
+}
+
+func (c *Client) ApplyCrd(crd v1.CustomResourceDefinition) error {
+	oldCrd := c.GetCrd(crd.Name)
+	var err error
+	if oldCrd == nil {
+		_, err = c.Clientset.ApiextensionsV1().CustomResourceDefinitions().Create(context.TODO(), &crd, metav1.CreateOptions{})
+	} else {
+		crd.ObjectMeta.ResourceVersion = oldCrd.ObjectMeta.ResourceVersion
+		_, err = c.Clientset.ApiextensionsV1().CustomResourceDefinitions().Update(context.TODO(), &crd, metav1.UpdateOptions{})
+	}
+	return err
+}
+
+func (c *Client) FetchCrds() error {
+	l, err := c.Clientset.ApiextensionsV1().CustomResourceDefinitions().List(context.TODO(), metav1.ListOptions{})
+	if err != nil {
+		return err
+	}
+	c.crds = l.Items
+	return nil
+}
+
+func (c *Client) ListResources(crd v1.CustomResourceDefinition) ([]unstructured.Unstructured, error) {
+	data, err := c.DynamicClient.Resource(
+		schema.GroupVersionResource{
+			Group:    crd.Spec.Group,
+			Version:  crd.Spec.Versions[0].Name,
+			Resource: crd.Spec.Names.Plural,
+		}).List(context.TODO(), metav1.ListOptions{})
+	if err != nil {
+		return nil, err
+	}
+	return data.Items, err
+}
+
+func (c *Client) FetchGroup(groupPath string) error {
+	file, err := os.ReadFile(fmt.Sprintf("%s", groupPath))
+	if err != nil {
+		return err
+	}
+	c.group = strings.TrimSpace(string(file))
+	return nil
+}
+
+func GetRestConfig() (*rest.Config, error) {
+	filePath := os.Getenv("KUBECONFIG")
+	if filePath != "" {
+		config, err := clientcmd.BuildConfigFromFlags("", filePath)
+		if err != nil {
+			return nil, err
+		}
+		return config, nil
+	}
+	config, err := rest.InClusterConfig()
+	if err != nil {
+		return nil, err
+	}
+	return config, nil
+}
diff --git a/install-validator/pkg/k8s-utils/mocks/client.go b/install-validator/pkg/k8s-utils/mocks/client.go
new file mode 100644
index 000000000..45fbb10e8
--- /dev/null
+++ b/install-validator/pkg/k8s-utils/mocks/client.go
@@ -0,0 +1,150 @@
+// Code generated by MockGen. DO NOT EDIT.
+// Source: client.go
+
+// Package mock_k8s_utils is a generated GoMock package.
+package mock_k8s_utils
+
+import (
+	reflect "reflect"
+
+	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
+
+	gomock "github.com/golang/mock/gomock"
+	v1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
+)
+
+// MockClientInt is a mock of ClientInt interface.
+type MockClientInt struct {
+	ctrl     *gomock.Controller
+	recorder *MockClientIntMockRecorder
+}
+
+// MockClientIntMockRecorder is the mock recorder for MockClientInt.
+type MockClientIntMockRecorder struct {
+	mock *MockClientInt
+}
+
+// NewMockClientInt creates a new mock instance.
+func NewMockClientInt(ctrl *gomock.Controller) *MockClientInt {
+	mock := &MockClientInt{ctrl: ctrl}
+	mock.recorder = &MockClientIntMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use.
+func (m *MockClientInt) EXPECT() *MockClientIntMockRecorder {
+	return m.recorder
+}
+
+// ApplyCrd mocks base method.
+func (m *MockClientInt) ApplyCrd(crd v1.CustomResourceDefinition) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "ApplyCrd", crd)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// ApplyCrd indicates an expected call of ApplyCrd.
+func (mr *MockClientIntMockRecorder) ApplyCrd(crd interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "ApplyCrd", reflect.TypeOf((*MockClientInt)(nil).ApplyCrd), crd)
+}
+
+// DeleteCrd mocks base method.
+func (m *MockClientInt) DeleteCrd(name string) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "DeleteCrd", name)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// DeleteCrd indicates an expected call of DeleteCrd.
+func (mr *MockClientIntMockRecorder) DeleteCrd(name interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "DeleteCrd", reflect.TypeOf((*MockClientInt)(nil).DeleteCrd), name)
+}
+
+// FetchCrds mocks base method.
+func (m *MockClientInt) FetchCrds() error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "FetchCrds")
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// FetchCrds indicates an expected call of FetchCrds.
+func (mr *MockClientIntMockRecorder) FetchCrds() *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "FetchCrds", reflect.TypeOf((*MockClientInt)(nil).FetchCrds))
+}
+
+// GetCrd mocks base method.
+func (m *MockClientInt) GetCrd(name string) *v1.CustomResourceDefinition {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "GetCrd", name)
+	ret0, _ := ret[0].(*v1.CustomResourceDefinition)
+	return ret0
+}
+
+// GetCrd indicates an expected call of GetCrd.
+func (mr *MockClientIntMockRecorder) GetCrd(name interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetCrd", reflect.TypeOf((*MockClientInt)(nil).GetCrd), name)
+}
+
+// GetCrds mocks base method.
+func (m *MockClientInt) GetCrds() []v1.CustomResourceDefinition {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "GetCrds")
+	ret0, _ := ret[0].([]v1.CustomResourceDefinition)
+	return ret0
+}
+
+// GetCrds indicates an expected call of GetCrds.
+func (mr *MockClientIntMockRecorder) GetCrds() *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetCrds", reflect.TypeOf((*MockClientInt)(nil).GetCrds))
+}
+
+// GetGroup mocks base method.
+func (m *MockClientInt) GetGroup() string {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "GetGroup")
+	ret0, _ := ret[0].(string)
+	return ret0
+}
+
+// GetGroup indicates an expected call of GetGroup.
+func (mr *MockClientIntMockRecorder) GetGroup() *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetGroup", reflect.TypeOf((*MockClientInt)(nil).GetGroup))
+}
+
+// ListResources mocks base method.
+func (m *MockClientInt) ListResources(crd v1.CustomResourceDefinition) ([]unstructured.Unstructured, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "ListResources", crd)
+	ret0, _ := ret[0].([]unstructured.Unstructured)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// ListResources indicates an expected call of ListResources.
+func (mr *MockClientIntMockRecorder) ListResources(crd interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "ListResources", reflect.TypeOf((*MockClientInt)(nil).ListResources), crd)
+}
+
+// ListResources mocks base method.
+func (m *MockClientInt) FetchGroup(groupPath string) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "FetchGroup", groupPath)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// ListResources indicates an expected call of ListResources.
+func (mr *MockClientIntMockRecorder) FetchGroup(crd interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "FetchGroup", reflect.TypeOf((*MockClientInt)(nil).ListResources), crd)
+}