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Where is my cache?
Architectural patterns for caching
microservices by example
Rafał Leszko
@RafalLeszko
Hazelcast
About me
● Cloud Software Engineer at Hazelcast
● Worked at Google and CERN
● Author of the book "Continuous Delivery
with Docker and Jenkins"
● Trainer and conference speaker
● Live in Kraków, Poland
About Hazelcast
● Distributed Company
● Open Source Software
● 140+ Employees
● Hiring (Remote)!
● Recently Raised $21M
● Products:
○ Hazelcast IMDG
○ Hazelcast Jet
○ Hazelcast Cloud
@Hazelcast
www.hazelcast.com
● Introduction
● Caching Architectural Patterns
○ Embedded
○ Embedded Distributed
○ Client-Server
○ Cloud
○ Sidecar
○ Reverse Proxy
○ Reverse Proxy Sidecar
● Summary
Agenda
Why Caching?
● Performance
○ Decrease latency
○ Reduce load
● Resilience
○ High availability
○ Lower downtime
Service 1
Service 2
v1
Service 2
v2
Service 1
Service 4
v1
Service 4
v2
Service 4
v3
Ruby
Microservice World
Service 1
Service 2
v1
Service 2
v2
Service 1
Service 4
v1
Service 4
v2
Service 4
v3
Ruby
Microservice World
cache
cache
cache
cache
Service 1
Service 2
v1
Service 2
v2
Service 1
Service 4
v1
Service 4
v2
Service 4
v3
Ruby
Microservice World cache
cache
cache
Service 1
Service 2
v1
Service 2
v2
Service 1
Service 4
v1
Service 4
v2
Service 4
v3
Ruby
Microservice World
cache
cache
cache
● Introduction ✔
● Caching Architectural Patterns
○ Embedded
○ Embedded Distributed
○ Client-Server
○ Cloud
○ Sidecar
○ Reverse Proxy
○ Reverse Proxy Sidecar
● Summary
Agenda
1. Embedded
Application
Load Balancer
Cache
Application
Cache
Request
Embedded Cache
private ConcurrentHashMap<String, String> cache =
new ConcurrentHashMap<>();
private String processRequest(String request) {
if (cache.contains(request)) {
return cache.get(request);
}
String response = process(request);
cache.put(request, response);
return response;
}
Embedded Cache (Pure Java implementation)
private ConcurrentHashMap<String, String> cache =
new ConcurrentHashMap<>();
private String processRequest(String request) {
if (cache.contains(request)) {
return cache.get(request);
}
String response = process(request);
cache.put(request, response);
return response;
}
Embedded Cache (Pure Java implementation)
● No Eviction Policies
● No Max Size Limit
(OutOfMemoryError)
● No Statistics
● No built-in Cache Loaders
● No Expiration Time
● No Notification Mechanism
Java Collection is not a Cache!
CacheBuilder.newBuilder()
.initialCapacity(300)
.expireAfterAccess(Duration.ofMinutes(10))
.maximumSize(1000)
.build();
Embedded Cache (Java libraries)
Embedded Cache (Java libraries)
CacheBuilder.newBuilder()
.initialCapacity(300)
.expireAfterAccess(Duration.ofMinutes(10))
.maximumSize(1000)
.build();
Caching Application Layer
@Service
public class BookService {
@Cacheable("books")
public String getBookNameByIsbn(String isbn) {
return findBookInSlowSource(isbn);
}
}
Caching Application Layer
@Service
public class BookService {
@Cacheable("books")
public String getBookNameByIsbn(String isbn) {
return findBookInSlowSource(isbn);
}
}
Be Careful, Spring uses ConcurrentHashMap by default!
Application
Load Balancer
Cache
Application
Cache
Request
Embedded Cache
1*. Embedded Distributed
Application
Application
Load Balancer
Cache
Cache
Request
Hazelcast
Cluster
Embedded Distributed Cache
@Configuration
public class HazelcastConfiguration {
@Bean
CacheManager cacheManager() {
return new HazelcastCacheManager(
Hazelcast.newHazelcastInstance());
}
}
Embedded Distributed Cache (Spring with Hazelcast)
Hazelcast Discovery Plugins
Hazelcast Discovery Plugins
Hazelcast Discovery Plugins
Application
Application
Load Balancer
Cache
Cache
Request
Hazelcast
Cluster
Embedded Distributed Cache
Embedded Cache
Pros Cons
● Simple configuration /
deployment
● Low-latency data access
● No separate Ops Team
needed
● Not flexible management
(scaling, backup)
● Limited to JVM-based
applications
● Data collocated with
applications
● Introduction ✔
● Caching Architectural Patterns
○ Embedded ✔
○ Embedded Distributed ✔
○ Client-Server
○ Cloud
○ Sidecar
○ Reverse Proxy
○ Reverse Proxy Sidecar
● Summary
Agenda
2. Client-Server
Application
Load Balancer
Application
Request
Cache Server
Client-Server Cache
Application
Load Balancer
Application
Request
Cache Server
Client-Server Cache
Application
Load Balancer
Application
Request
Cache Server
Client-Server Cache
Separate Management:
● backups
● (auto) scaling
● security
Ops Team
Application
Load Balancer
Application
Request
Cache Server
Client-Server Cache
Application
Load Balancer
Application
Request
Cache Server
Client-Server Cache
Client-Server Cache
Client-Server Cache
Application
Load Balancer
Application
Request
Cache Server
Client-Server Cache
Ops Team
Separate Management:
● backups
● (auto) scaling
● security
2*. Cloud
Application
Load Balancer
Application
Request
Cloud (Cache as a Service)
Application
Load Balancer
Application
Request
Cloud (Cache as a Service)
Management:
● backups
● (auto) scaling
● security
Ops Team
Application
Load Balancer
Application
Request
Cloud (Cache as a Service)
Management:
● backups
● (auto) scaling
● security
Ops Team
Application
Load Balancer
Application
Request
Cloud (Cache as a Service)
@Configuration
public class HazelcastCloudConfiguration {
@Bean
CacheManager cacheManager() {
ClientConfig clientConfig = new ClientConfig();
clientConfig.getNetworkConfig().getCloudConfig()
.setEnabled(true)
.setDiscoveryToken("KSXFDTi5HXPJGR0wRAjLgKe45tvEEhd");
clientConfig.setGroupConfig(
new GroupConfig("test-cluster", "b2f984b5dd3314"));
return new HazelcastCacheManager(
HazelcastClient.newHazelcastClient(clientConfig));
}
}
Cloud (Cache as a Service)
Client-Server (Cloud) Cache
Pros Cons
● Data separate from
applications
● Separate management
(scaling, backup)
● Programming-language
agnostic
● Separate Ops effort
● Higher latency
● Server network requires
adjustment (same region,
same VPC)
● Introduction ✔
● Caching Architectural Patterns
○ Embedded ✔
○ Embedded Distributed ✔
○ Client-Server ✔
○ Cloud ✔
○ Sidecar
○ Reverse Proxy
○ Reverse Proxy Sidecar
● Summary
Agenda
3. Sidecar
Kubernetes Service
(Load Balancer)
Request
Hazelcast
Cluster
Kubernetes POD
Application Container
Cache Container
Application Container
Cache Container
Kubernetes POD
Sidecar Cache
Sidecar Cache
Similar to Embedded:
● the same physical machine
● the same resource pool
● scales up and down together
● no discovery needed (always localhost)
Similar to Client-Server:
● different programming language
● uses cache client to connect
● clear isolation between app and cache
@Configuration
public class HazelcastSidecarConfiguration {
@Bean
CacheManager cacheManager() {
ClientConfig clientConfig = new ClientConfig();
clientConfig.getNetworkConfig()
.addAddress("localhost:5701");
return new HazelcastCacheManager(HazelcastClient
.newHazelcastClient(clientConfig));
}
}
Sidecar Cache
Sidecar Cache
apiVersion: apps/v1
kind: Deployment
...
spec:
template:
spec:
containers:
- name: application
image: leszko/application
- name: hazelcast
image: hazelcast/hazelcast
Sidecar Cache
Pros Cons
● Simple configuration
● Programming-language
agnostic
● Low latency
● Some isolation of data and
applications
● Limited to container-based
environments
● Not flexible management
(scaling, backup)
● Data collocated with
application PODs
● Introduction ✔
● Caching Architectural Patterns
○ Embedded ✔
○ Embedded Distributed ✔
○ Client-Server ✔
○ Cloud ✔
○ Sidecar ✔
○ Reverse Proxy
○ Reverse Proxy Sidecar
● Summary
Agenda
4. Reverse Proxy
Application
Load
Balancer
Cache
Application
Request
Reverse Proxy Cache
Reverse Proxy Cache
http {
...
proxy_cache_path /data/nginx/cache
keys_zone=one:10m;
...
}
● Only for HTTP
● Not distributed
● No High Availability
● Data stored on the disk
NGINX Reverse Proxy Cache Issues
4*. Reverse Proxy Sidecar
Kubernetes Service
(Load Balancer)
Request
Hazelcast
Cluster
Kubernetes POD
Application Container
Reverse Proxy Cache
Container
Application Container
Reverse Proxy Cache
Container
Kubernetes POD
Reverse Proxy Sidecar Cache
Good
Reverse Proxy Sidecar Cache
Service 1
Service 2
v1
Service 2
v2
Service 1
Service 4
v1
Service 4
v2
Service 4
v3
Ruby
Reverse Proxy Sidecar Cache
Service 1
Service 2
v1
Service 2
v2
Service 1
Service 4
v1
Service 4
v2
Service 4
v3
Ruby
Reverse Proxy Sidecar Cache
apiVersion: apps/v1
kind: Deployment
...
spec:
template:
spec:
initContainers:
- name: init-networking
image: leszko/init-networking
containers:
- name: caching-proxy
image: leszko/caching-proxy
- name: application
image: leszko/application
Reverse Proxy Sidecar Cache
Service 1
Service 2
v1
Service 2
v2
Service 1
Service 4
v1
Service 4
v2
Service 4
v3
Ruby
Bad
Reverse Proxy Cache
@CacheEvict(value = "someValue", allEntries = true)
public void evictAllCacheValues() {}
Application Cache:
Reverse Proxy Cache
@CacheEvict(value = "someValue", allEntries = true)
public void evictAllCacheValues() {}
Application Cache:
Proxy Cache:
http {
...
location / {
add_header Cache-Control public;
expires 86400;
etag on;
}
}
Reverse Proxy (Sidecar) Cache
Pros Cons
● Configuration-based (no
need to change
applications)
● Programming-language
agnostic
● Consistent with containers
and microservice world
● Difficult cache invalidation
● No mature solutions yet
● Protocol-based (e.g. works
only with HTTP)
● Introduction ✔
● Caching Architectural Patterns
○ Embedded ✔
○ Embedded Distributed ✔
○ Client-Server ✔
○ Cloud ✔
○ Sidecar ✔
○ Reverse Proxy ✔
○ Reverse Proxy Sidecar ✔
● Summary
Agenda
Summary
application-aware?
application-aware?
containers?
no
application-aware?
containers?
Reverse Proxy
no
no
application-aware?
containers?
Reverse ProxyReverse Proxy
Sidecar
no
yes no
application-aware?
containers?
Reverse ProxyReverse Proxy
Sidecar
lot of data?
security restrictions?
yes no
yes no
application-aware?
containers?
Reverse ProxyReverse Proxy
Sidecar
lot of data?
security restrictions?
language-agnostic?
containers?
yes no
yes nono
application-aware?
containers?
Reverse ProxyReverse Proxy
Sidecar
lot of data?
security restrictions?
language-agnostic?
containers?
Embedded
(Distributed)
yes no
yes no
no
no
application-aware?
containers?
Reverse ProxyReverse Proxy
Sidecar
lot of data?
security restrictions?
language-agnostic?
containers?
Embedded
(Distributed)
Sidecar
yes no
yes
yes no
no
no
application-aware?
containers?
Reverse ProxyReverse Proxy
Sidecar
lot of data?
security restrictions?
language-agnostic?
containers?
Embedded
(Distributed)
Sidecar
cloud?
yes no
yes
yes
yes no
no
no
application-aware?
containers?
Reverse ProxyReverse Proxy
Sidecar
lot of data?
security restrictions?
language-agnostic?
containers?
Embedded
(Distributed)
Sidecar
cloud?
Client-Server
yes no
yes
yes
yes no
nono
no
application-aware?
containers?
Reverse ProxyReverse Proxy
Sidecar
lot of data?
security restrictions?
language-agnostic?
containers?
Embedded
(Distributed)
Sidecar
cloud?
Client-ServerCloud
yes no
yes
yes yes
yes no
nono
no
Resources
● Hazelcast Sidecar Container Pattern:
https://hazelcast.com/blog/hazelcast-sidecar-container-pattern/
● Hazelcast Reverse Proxy Sidecar Caching Prototype:
https://github.com/leszko/caching-injector
● Caching Best Practices:
https://vladmihalcea.com/caching-best-practices/
● NGINX HTTP Reverse Proxy Caching:
https://www.nginx.com/resources/videos/best-practices-for-caching
/
Thank You!
Rafał Leszko
@RafalLeszko

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