diff --git a/Makefile b/Makefile
index 2d90f39b5..2144cdbf4 100644
--- a/Makefile
+++ b/Makefile
@@ -3,18 +3,20 @@
 THIS_FILE := $(lastword $(MAKEFILE_LIST))
 
 TEST?=$$(go list ./... | grep -v /vendor/ | grep -v /integ)
-TEST_TIMEOUT?=30m
-EXTENDED_TEST_TIMEOUT=45m
+TEST_TIMEOUT?=45m
+EXTENDED_TEST_TIMEOUT=60m
+INTEG_TEST_TIMEOUT=120m
 VETARGS?=-asmdecl -atomic -bool -buildtags -copylocks -methods -nilfunc -printf -rangeloops -shift -structtags -unsafeptr
 EXTERNAL_TOOLS=\
 	github.com/elazarl/go-bindata-assetfs/... \
 	github.com/hashicorp/go-bindata/... \
 	github.com/mitchellh/gox \
 	github.com/kardianos/govendor \
-	github.com/client9/misspell/cmd/misspell
+	github.com/client9/misspell/cmd/misspell \
+	github.com/golangci/golangci-lint/cmd/golangci-lint
 GOFMT_FILES?=$$(find . -name '*.go' | grep -v pb.go | grep -v vendor)
 
-GO_VERSION_MIN=1.11
+GO_VERSION_MIN=1.12.4
 CGO_ENABLED?=0
 ifneq ($(FDB_ENABLED), )
 	CGO_ENABLED=1
@@ -97,6 +99,18 @@ vet:
 			echo "and fix them if necessary before submitting the code for reviewal."; \
 		fi
 
+# lint runs vet plus a number of other checkers, it is more comprehensive, but louder
+lint:
+	@go list -f '{{.Dir}}' ./... | grep -v /vendor/ \
+		| xargs golangci-lint run; if [ $$? -eq 1 ]; then \
+			echo ""; \
+			echo "Lint found suspicious constructs. Please check the reported constructs"; \
+			echo "and fix them if necessary before submitting the code for reviewal."; \
+		fi
+# for ci jobs, runs lint against the changed packages in the commit
+ci-lint:
+	@golangci-lint run --deadline 10m --new-from-rev=HEAD~
+
 # prep runs `go generate` to build the dynamically generated
 # source files.
 prep: fmtcheck
@@ -117,7 +131,7 @@ ci-verify:
 bootstrap:
 	@for tool in  $(EXTERNAL_TOOLS) ; do \
 		echo "Installing/Updating $$tool" ; \
-		go get -u $$tool; \
+		GO111MODULE=off go get -u $$tool; \
 	done
 
 # Note: if you have plugins in GOPATH you can update all of them via something like:
diff --git a/helper/testhelpers/testhelpers.go b/helper/testhelpers/testhelpers.go
index 2f63614f1..c11728fc8 100644
--- a/helper/testhelpers/testhelpers.go
+++ b/helper/testhelpers/testhelpers.go
@@ -657,6 +657,26 @@ func WaitForMatchingMerkleRoots(t testing.T, endpoint string, primary, secondary
 	t.Fatalf("roots did not become equal")
 }
 
+func WaitForMatchingMerkleRootsCore(t testing.T, pri, sec *vault.TestClusterCore, dr bool) {
+	rootFunc := vault.PerformanceMerkleRoot
+	if dr {
+		rootFunc = vault.DRMerkleRoot
+	}
+
+	t.Helper()
+	for i := 0; i < 30; i++ {
+		secRoot := rootFunc(pri.Core)
+		priRoot := rootFunc(pri.Core)
+
+		if reflect.DeepEqual(priRoot, secRoot) {
+			return
+		}
+		time.Sleep(time.Second)
+	}
+
+	t.Fatalf("roots did not become equal")
+}
+
 func WaitForWAL(t testing.T, c *vault.TestClusterCore, wal uint64) {
 	timeout := time.Now().Add(3 * time.Second)
 	for {
diff --git a/vault/core.go b/vault/core.go
index cc5295edf..7f8cf76e7 100644
--- a/vault/core.go
+++ b/vault/core.go
@@ -93,13 +93,16 @@ var (
 	manualStepDownSleepPeriod = 10 * time.Second
 
 	// Functions only in the Enterprise version
-	enterprisePostUnseal = enterprisePostUnsealImpl
-	enterprisePreSeal    = enterprisePreSealImpl
-	startReplication     = startReplicationImpl
-	stopReplication      = stopReplicationImpl
-	LastWAL              = lastWALImpl
-	LastRemoteWAL        = lastRemoteWALImpl
-	WaitUntilWALShipped  = waitUntilWALShippedImpl
+	enterprisePostUnseal  = enterprisePostUnsealImpl
+	enterprisePreSeal     = enterprisePreSealImpl
+	startReplication      = startReplicationImpl
+	stopReplication       = stopReplicationImpl
+	LastWAL               = lastWALImpl
+	LastPerformanceWAL    = lastPerformanceWALImpl
+	PerformanceMerkleRoot = merkleRootImpl
+	DRMerkleRoot          = merkleRootImpl
+	LastRemoteWAL         = lastRemoteWALImpl
+	WaitUntilWALShipped   = waitUntilWALShippedImpl
 )
 
 // NonFatalError is an error that can be returned during NewCore that should be
@@ -1832,10 +1835,18 @@ func waitUntilWALShippedImpl(ctx context.Context, c *Core, index uint64) bool {
 	return true
 }
 
+func merkleRootImpl(c *Core) string {
+	return ""
+}
+
 func lastWALImpl(c *Core) uint64 {
 	return 0
 }
 
+func lastPerformanceWALImpl(c *Core) uint64 {
+	return 0
+}
+
 func lastRemoteWALImpl(c *Core) uint64 {
 	return 0
 }