feat: Add cloud deployment example with event replication #389
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Summary of ChangesHello @kabir, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request delivers a robust cloud deployment example for A2A agents, showcasing a scalable and resilient architecture on Kubernetes. It integrates PostgreSQL for task persistence and Kafka for real-time event replication, allowing multiple agent instances to operate cohesively. The example comes with comprehensive deployment scripts and a verification client, making it easy to set up and test a distributed A2A agent environment. This directly addresses issues #281 and #373 by providing a concrete implementation for cloud-native A2A agents. Highlights
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Code Review
This pull request introduces a cloud deployment example for the A2A agent using Kubernetes, PostgreSQL, and Kafka. It includes deployment scripts, Kubernetes configurations, and a test client to demonstrate multi-pod behavior with load balancing and event replication. The changes involve adding new files for the deployment setup and modifying the pom.xml to include the new module. The review focuses on ensuring the deployment scripts are robust, the Kubernetes configurations are secure and efficient, and the documentation is clear and comprehensive.
| if ! kubectl get crd kafkas.kafka.strimzi.io > /dev/null 2>&1; then | ||
| echo "Installing Strimzi operator..." | ||
| kubectl create -f 'https://strimzi.io/install/latest?namespace=kafka' -n kafka |
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The script is installing the Strimzi operator without checking if the kafka namespace already exists. This can lead to errors if the namespace was previously created with different configurations. It's recommended to check for the namespace's existence before attempting to create it.
| if ! kubectl get crd kafkas.kafka.strimzi.io > /dev/null 2>&1; then | |
| echo "Installing Strimzi operator..." | |
| kubectl create -f 'https://strimzi.io/install/latest?namespace=kafka' -n kafka | |
| if ! kubectl get namespace kafka > /dev/null 2>&1; then | |
| echo "Creating kafka namespace..." | |
| kubectl create namespace kafka | |
| fi |
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We actually have this earlier, on lines 167-170. Also it looks like your suggestion skips installing the operator :-D
| echo "Waiting for Kafka to be ready (using KRaft mode, typically 2-3 minutes)..." | ||
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| # Monitor progress while waiting | ||
| for i in {1..60}; do | ||
| echo "Checking Kafka status (attempt $i/60)..." | ||
| kubectl get kafka -n kafka -o wide 2>/dev/null || true | ||
| kubectl get pods -n kafka -l strimzi.io/cluster=a2a-kafka 2>/dev/null || true | ||
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| if kubectl wait --for=condition=Ready kafka/a2a-kafka -n kafka --timeout=10s 2>/dev/null; then | ||
| echo -e "${GREEN}✓ Kafka deployed${NC}" | ||
| break | ||
| fi | ||
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| if [ $i -eq 60 ]; then | ||
| echo -e "${RED}ERROR: Timeout waiting for Kafka${NC}" | ||
| kubectl describe kafka/a2a-kafka -n kafka | ||
| kubectl get events -n kafka --sort-by='.lastTimestamp' | ||
| exit 1 | ||
| fi | ||
| done |
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The script waits for Kafka to be ready but doesn't handle potential errors during the Kafka deployment process effectively. If Kafka fails to deploy, the script continues, leading to subsequent failures. Consider adding more robust error handling and logging to diagnose Kafka deployment issues.
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- We loop 60 times (10 minutes total)
- We display status on each attempt
- On timeout, we run kubectl describe and show recent events
- We exit with error code 1
We DO exit on timeout (line 232: exit 1). This is already robust.
| if [ "$($CONTAINER_TOOL inspect -f '{{.State.Running}}' "${REG_NAME}" 2>/dev/null || true)" != 'true' ]; then | ||
| echo "Creating registry container..." | ||
| $CONTAINER_TOOL run \ | ||
| -d --restart=always -p "127.0.0.1:${REG_PORT}:5000" --network bridge --name "${REG_NAME}" \ | ||
| registry:2 | ||
| echo -e "${GREEN}✓ Registry container created${NC}" |
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The script checks if the registry container is running, but it doesn't verify if the registry is healthy and accessible before pushing images. This can lead to image push failures if the registry is in a bad state. Add a check to verify the registry's health before pushing images.
| if [ "$($CONTAINER_TOOL inspect -f '{{.State.Running}}' "${REG_NAME}" 2>/dev/null || true)" != 'true' ]; then | |
| echo "Creating registry container..." | |
| $CONTAINER_TOOL run \ | |
| -d --restart=always -p "127.0.0.1:${REG_PORT}:5000" --network bridge --name "${REG_NAME}" \ | |
| registry:2 | |
| echo -e "${GREEN}✓ Registry container created${NC}" | |
| if [ "$($CONTAINER_TOOL inspect -f '{{.State.Running}}' "${REG_NAME}" 2>/dev/null || true)" != 'true' ]; then | |
| echo "Creating registry container..." | |
| $CONTAINER_TOOL run \ | |
| -d --restart=always -p "127.0.0.1:${REG_PORT}:5000" --network bridge --name "${REG_NAME}" \ | |
| registry:2 | |
| echo -e "${GREEN}✓ Registry container created${NC}" | |
| else | |
| echo -e "${GREEN}✓ Registry container already running${NC}" | |
| # Verify registry is accessible | |
| if ! curl -s http://localhost:${REG_PORT}/v2/ > /dev/null 2>&1; then | |
| echo -e "${RED}ERROR: Registry not accessible${NC}" | |
| exit 1 | |
| fi | |
| fi |
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We check this on lines 127-135
| kubectl describe kafka/a2a-kafka -n kafka | ||
| kubectl get events -n kafka --sort-by='.lastTimestamp' | ||
| exit 1 |
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Consider adding a check to ensure that the Kafka topic is created successfully before proceeding. This could prevent issues later in the deployment process if the topic creation fails.
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We check this on line 241
Add Kubernetes deployment example demonstrating multi-instance A2A agents with database persistence and Kafka-based event replication.
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…#389) Add Kubernetes deployment example demonstrating multi-instance A2A agents with database persistence and Kafka-based event replication. Fixes a2aproject#281 and a2aproject#373 --------- Co-authored-by: Farah Juma <fjuma@redhat.com>
Add Kubernetes deployment example demonstrating multi-instance A2A agents with database persistence and Kafka-based event replication.
Fixes #281 and #373