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@mesutcelik
Distributed Caching Patterns
in Kubernetes
Mesut Celik,Hazelcast
@mesutcelik
Mesut Celik
● Tech Lead @Hazelcast
● Java Developer
● lived in Turkey,Belgium,US
● Twitter: @mesutcelik
@mesutcelik
Agenda
● Hazelcast Introduction
● Caching Patterns
● Kubernetes Deployments
● Day 2 Operations
@mesutcelik
Hazelcast Products
● Hazelcast IMDG
● Hazelcast Jet
● Hazelcast Cloud
● Management Center
Hazelcast is an Open Source
Company
● Apache 2 License
● Remote friendly
● raised $21M series C
● Always hiring!!!!
@mesutcelik
Why Distributed Cache?
● Cache, Memory is faster than storage
● Distributed,Natural fit for Cloud-Native Deployments
@mesutcelik
Cache Layers
@mesutcelik
Caching Patterns
@mesutcelik
Cache-aside
Application
DB
Cache
Application
DB
Cache
Read-through, Write-through, Write-behind
Caching Patterns
Cache-as-SoR
@mesutcelik
Read-Through Cache
@mesutcelik
Read-Through Cache 1,MinskPartition_34
1,MinskBackup_34
@mesutcelik
Hazelcast and Kubernetes
Caching Patterns
@mesutcelik
Distributed Caching Patterns in Kubernetes
● Embedded
● Sidecar
● Proxy Cache
● Client-Server
@mesutcelik
POD
Spring Boot Microservice
Hazelcast
Member
POD
Hazelcast ClusterKubernetesService
Http Request
Embedded
Spring Boot Microservice
Hazelcast
Member
Kubernetes Cluster
@mesutcelik
Embedded
● Simple
● Java only
● Data co-located with Microservice JVM
@mesutcelik
Python
Microservice
POD
Hazelcast
Member
Python
Microservice
POD
Hazelcast
Member
Hazelcast ClusterKubernetesService
Http Request
SideCar Kubernetes Cluster
hazelcast-client
hazelcast-client
@mesutcelik
Sidecar
● Simple
● Multiple Programming Languages
○ Java, Node.js, .NET, Python, Golang
● Data co-located with Microservice POD
hazelcast-proxy
sidecar
POD
Spring Boot
Application
POD
Spring Boot
Application
Hazelcast ClusterKubernetesService
Http Request
Http reverse
proxy caching
Hazelcast
Member
hazelcast-proxy
sidecar
Hazelcast
Member
Kubernetes Cluster
Http reverse proxy caching
● Injecting Cache into every microservice
● No coupling with any Cache API
● Enabled w/o code change
@mesutcelik
POD
Spring Boot Microservice
hazelcast-java-client
Hazelcast ClusterKubernetesService
Http Request
Client Server
POD
Hazelcast
Member
POD
Hazelcast
Member
Kubernetes Cluster
POD
Spring Boot Microservice
hazelcast-java-client
POD
ASP.NET Core
Microservice
hazelcast-dotnet-client
KubernetesService
Http Request
@mesutcelik
POD
KubernetesService
Http Request
Hazelcast Cloud
POD
cloud.hazelcast.com
Hazelcast Cluster
Kubernetes Cluster
Spring Boot
Application
hazelcast-client
Spring Boot
Application
hazelcast-client
@mesutcelik
Client Server
● CaaS - Cache as a Service
● Multiple Programming Languages
○ Java, nodejs, .NET, Python, Golang
● Separate Microservice and Hazelcast Layers
@mesutcelik
Spring Boot - Hazelcast Embedded Config
@Bean
public Config hazelcastConfig() {
Config config = new Config();
JoinConfig joinConfig = config.getNetworkConfig().getJoin();
joinConfig.getMulticastConfig().setEnabled(false);
joinConfig.getKubernetesConfig().setEnabled(true);
return config;
}
@mesutcelik
Spring Boot - Hazelcast Client Config
@Bean
public ClientConfig hazelcastConfig() {
ClientConfig config = new ClientConfig();
config.getNetworkConfig().getKubernetesConfig().setEnabled(true);
return config;
}
@mesutcelik
Hazelcast Cache Put and Get Operations
@Autowired
HazelcastInstance hazelcast;
Map<String, String> cities = hazelcast.getMap("cities");
cities.put("1","Minsk");
System.out.println("Best City in the world is " + cities.get("1"));
@mesutcelik
Kubernetes Deployment Options
For Hazelcast
@mesutcelik
Hazelcast Helm Chart
$ helm install stable/hazelcast
@mesutcelik
Hazelcast Kubernetes Operator
● OperatorHub.io
● Openshift 4 Operator Catalog
● IBM Cloud Private
@mesutcelik
Hazelcast Cloud
● Managed Service
● Pay as you go model
● https://cloud.hazelcast.com
@mesutcelik
Deployment Best Practices
@mesutcelik
Predictable Resource Allocation
● Calculate CPU/Memory Requirements
● Set Resource Request and Limits as the same value
@mesutcelik
Pod Anti-Affinity
● Hazelcast per K8S Node
● Large Kubernetes Clusters
● Safer in Node crushes
@mesutcelik
Multi-zone Deployment with ZONE_AWARE
hazelcast-member -1
hazelcast-member -2
hazelcast-member -3
Availability-Zone-A
hazelcast-member -4
hazelcast-member -5
hazelcast-member -6
Availability-Zone-B
Multi-zone Hazelcast Cluster
* Multi-zone if your architecture prefers availability over performance
@mesutcelik
Day 2 Operations
@mesutcelik
Scaling Hazelcast Cluster
● Manual Scaling (kubectl scale or helm upgrade)
● Horizontal Pod Autoscaler (HPA)
● Vertical Pod Autoscaler
● Cluster Autoscaler
@mesutcelik
Rolling Upgrade - Why?
● Hazelcast Version Update
● Config Change
● Adding Jar to the classpath
@mesutcelik
Rolling Upgrade - How?
● helm upgrade (--set image.tag)
● kubectl set image
● StatefulSet
● Deployment with RollingUpdateStrategy
● Enable Graceful Shutdown
● Optimized Grace Period
@mesutcelik
Monitoring
● Hazelcast Management Center
● Metrics via Prometheus
● Alerting
@mesutcelik
Thank you!
● https://twitter.com/mesutcelik
● https://github.com/mesutcelik
● https://www.linkedin.com/in/mesutcelik/

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Distributed Caching in Kubernetes with Hazelcast