Js-evaluator race with js-evaluator/impl/notification.go

Data race detected when running XDCR test cases using race detector.

==================
WARNING: DATA RACE
Write at 0x00c0000ad080 by goroutine 38:
runtime.mapassign_faststr()
/Users/neil.huang/.cbdepscache/exploded/x86_64/go-1.15.8/go/src/runtime/map_faststr.go:202 +0x0
github.com/couchbase/eventing-ee/js-evaluator/impl.(*notificationServer).NotifyPort()
/Users/neil.huang/source/couchbase/goproj/src/github.com/couchbase/eventing-ee/js-evaluator/impl/notification.go:64 +0xd7
github.com/couchbase/eventing-ee/gen/nftp/client._Notification_NotifyPort_Handler()
/Users/neil.huang/source/couchbase/goproj/src/github.com/couchbase/eventing-ee/gen/nftp/client/evaluator.pb.go:830 +0x306
google.golang.org/grpc.(*Server).processUnaryRPC()
/Users/neil.huang/source/couchbase/godeps/src/google.golang.org/grpc/server.go:966 +0x9c5
google.golang.org/grpc.(*Server).handleStream()
/Users/neil.huang/source/couchbase/godeps/src/google.golang.org/grpc/server.go:1245 +0x136b
google.golang.org/grpc.(*Server).serveStreams.func1.1()
/Users/neil.huang/source/couchbase/godeps/src/google.golang.org/grpc/server.go:685 +0xdc

Previous read at 0x00c0000ad080 by main goroutine:
runtime.mapaccess2_faststr()
/Users/neil.huang/.cbdepscache/exploded/x86_64/go-1.15.8/go/src/runtime/map_faststr.go:107 +0x0
github.com/couchbase/eventing-ee/js-evaluator/impl.(*notificationServer).WaitForWorkerPort()
/Users/neil.huang/source/couchbase/goproj/src/github.com/couchbase/eventing-ee/js-evaluator/impl/notification.go:71 +0xd9
github.com/couchbase/eventing-ee/js-evaluator/impl.(*evaluator).spawnWorkers()
/Users/neil.huang/source/couchbase/goproj/src/github.com/couchbase/eventing-ee/js-evaluator/impl/evaluator.go:74 +0x1dc
github.com/couchbase/eventing-ee/js-evaluator/impl.newEvaluator()
/Users/neil.huang/source/couchbase/goproj/src/github.com/couchbase/eventing-ee/js-evaluator/impl/evaluator.go:32 +0x465
github.com/couchbase/eventing-ee/js-evaluator/impl.(*Engine).Start()
/Users/neil.huang/source/couchbase/goproj/src/github.com/couchbase/eventing-ee/js-evaluator/impl/engine.go:35 +0x287
github.com/couchbase/goxdcr/service_impl.(*ResolverSvc).initEvaluator()
/Users/neil.huang/source/couchbase/goproj/src/github.com/couchbase/goxdcr/service_impl/resolver_service.go:195 +0x512
github.com/couchbase/goxdcr/service_impl.(*ResolverSvc).Start()
/Users/neil.huang/source/couchbase/goproj/src/github.com/couchbase/goxdcr/service_impl/resolver_service.go:132 +0x7c
github.com/couchbase/goxdcr/replication_manager.StartReplicationManager.func1()
/Users/neil.huang/source/couchbase/goproj/src/github.com/couchbase/goxdcr/replication_manager/replication_manager.go:166 +0x348
sync.(*Once).doSlow()
/Users/neil.huang/.cbdepscache/exploded/x86_64/go-1.15.8/go/src/sync/once.go:66 +0x109
sync.(*Once).Do()
/Users/neil.huang/.cbdepscache/exploded/x86_64/go-1.15.8/go/src/sync/once.go:57 +0x68
github.com/couchbase/goxdcr/replication_manager.StartReplicationManager()
/Users/neil.huang/source/couchbase/goproj/src/github.com/couchbase/goxdcr/replication_manager/replication_manager.go:152 +0x2d1
main.main()
goproj/src/github.com/couchbase/goxdcr/main/main.go:181 +0x1b86

Goroutine 38 (running) created at:
google.golang.org/grpc.(*Server).serveStreams.func1()
/Users/neil.huang/source/couchbase/godeps/src/google.golang.org/grpc/server.go:683 +0xb8
google.golang.org/grpc/internal/transport.(*http2Server).operateHeaders()
/Users/neil.huang/source/couchbase/godeps/src/google.golang.org/grpc/internal/transport/http2_server.go:419 +0x1545
google.golang.org/grpc/internal/transport.(*http2Server).HandleStreams()
/Users/neil.huang/source/couchbase/godeps/src/google.golang.org/grpc/internal/transport/http2_server.go:459 +0x324
google.golang.org/grpc.(*Server).serveStreams()
/Users/neil.huang/source/couchbase/godeps/src/google.golang.org/grpc/server.go:681 +0x1c1
google.golang.org/grpc.(*Server).handleRawConn.func1()
/Users/neil.huang/source/couchbase/godeps/src/google.golang.org/grpc/server.go:643 +0x50
==================