README.md

Data pipeline with Kafka, Kafka Streams, Flink and Thanos

Prerequisites

• Active Aiven account and project (https://aiven.io/)
• Aiven CLI (https://github.com/aiven/aiven-client)
• Terraform (https://learn.hashicorp.com/tutorials/terraform/install-cli)
• k8s cluster and kubectl command line tool
• Helm 3 (https://helm.sh/docs/intro/install/)
• jq command line tool (https://stedolan.github.io/jq/download/)
• kcat tool (https://github.com/edenhill/kcat)
• Jaeger K8s operator for tracing (https://jaegertracing.github.io/helm-charts/)
• Keda K8s operator for autoscaling (https://keda.sh/docs/2.10/deploy/#helm)

Infrastructure

cd <project-root>/infra
terraform apply

Download secrets

./get-demo-secrets.sh <aiven-project-name>

Prepare Postgres

Import weather station metadata

cd <project-root>/database
./import-stations.sh

Create k8s resources

Jaeger Tracing

Example deployments are utilising OpenTelemetry tracing. Jaeger is now fully compatible with OTLP tracing protocol so we only need Jaeger Operator. Follow the instructions on Jaeger Operator Helm Chart repo https://github.com/jaegertracing/helm-charts/tree/main/charts/jaeger-operator

KEDA Autoscaling

https://keda.sh/

https://keda.sh/docs/2.10/deploy/

helm repo add kedacore https://kedacore.github.io/charts
helm repo update
helm install keda kedacore/keda --namespace keda --create-namespace

List of Helm releases should now look something like this

❯ helm list -A
NAME               	NAMESPACE    	REVISION	UPDATED                              	STATUS  	CHART                      	APP VERSION
cert-manager       	cert-manager 	1       	2023-04-13 10:52:16.765519 +0300 EEST	deployed	cert-manager-v1.11.1       	v1.11.1
jaeger-operator    	observability	1       	2023-08-15 15:26:01.075019 +0300 EEST	deployed	jaeger-operator-2.46.2     	1.46.0
keda               	keda         	1       	2023-04-03 11:55:40.19998 +0300 EEST 	deployed	keda-2.10.1                	2.10.0

Your Kubernetes cluster is now ready for deploying the example applications.

cd <project-root>/k8s
kubectl create -f namespace.yaml
kubectl apply -k .

View event trace data

Jager UI provides user interface searching and visualiszing trace data. First forward Jeager port number 16686 to your host

kubectl -n tms-demo port-forward svc/simple-aiven-query 16686

Then you can open the localhost address http://localhost:16686 in your favourite Web browser. You will see the full path for observation event from receiving it as MQTT message and finally being processed by the Kafka Streams applications.

Deploy observability (Optional)

Follow instructions here