Hazelcast is a distributed, scalable, and open-source in-memory data grid that provides web session replication to enhance application performance and resilience. This feature allows real-time synchronization of session data across cluster members, supporting deployment flexibility and improving application management. The document outlines use cases, deployment options, and configuration details for Hazelcast's web session replication and overall architecture.

1. Hazelcast Web Session Replication

2. About me
E M R A H K O C A M A N
@emrahkocaman
emrah@hazelcast.com

3. What Is Hazelcast?
Hazelcast is a distributed,
highly available and scalable
Open Source In-Memory Data Grid

4. In Memory Data Grid
01001
10101
01010
In Memory
Data Computing
In Memory
Data Messaging
++In Memory
Data Storage

5. IM Data Store (Caching) Use Case
Database Caching Use-Case
Business Systems
A B C
RDBMS Mainframe
MongoDB
NoSQL
REST
Scale
Hazelcast
HD
Cache
Dist.
Compute
Dist.
Message

6. Hazelcast Servers
Hazelcast Server
JVM [Memory]
IM Distributed Computing Use Case
A B C
Business Logic
Data Data Data
CE = Compute Engine
Result
Business / Processing Logic
Result
TCP / IP
Client Client
HD
Cache
Dist.
Compute
Dist.
Message

7. IM Distributed Messaging Use Case
Hazelcast Distributed
Topic Bus
Hazelcast
Topic
Hazelcast
Node 1
Hazelcast
Node 2
Hazelcast
Node 3
MSG
Subscribes
Delivers
Subscribes
Delivers
HD
Cache
Dist.
Compute
Dist.
Message

8. Why Hazelcast?
Scale-out Computing enables cluster capacity to be
increased or decreased on-demand
Resilience with automatic recovery from member failures
without losing data while minimizing performance impact on
running applications
Programming Model provides a way for developers to easily
program a cluster application as if it is a single process
Fast Application Performance enables very large data sets
to be held in main memory for real-time performance

9. World-Class Customers
TELECOMMUNICATIONS
BANKING &
FINANCIAL SERVICES
HIGH-TECH
LOGISTICS
INSURANCE
GAMING & ENTERTAINMENT
CONSUMER &
ECOMMERCE

10. Ecosystem Traction
Dozens of Commercial and Open Source Projects Embed Hazelcast

11. Feature Overview

12. Map Set Queue Lock/
Sem. Atomics Topic User
DefinedMultiMap Ring
Buffer
Hazelcast In-memory Computing Platform
Java
C++ .NET
Portable Serialization /
Pluggable Serialization
Memcached REST Internal Client
Network Protocol
java.util.concurrent.*javax.cache.*Hibernate 2nd Level
Cache
Executor ServiceSQL Query Map / Reduce Aggregation
Low-level Services API
Node Engine
(Threads, Instances, Eventing, Wait/Notify, Invocation)
Partition Management
(Master Partition, Data Affinity, Replicas, Migrations, Partition Groups)
Cluster Management
(Multicast, IP List, AWS/OpenStack)
Networking
(IPv4, IPv6)
On-heap Storage
ManagementCenter
(API,JMX)
Security
(Connection,Encryption,Authentication,Authorization)
WAN
(TopologyAwarePartitionManagement,WANReplication)
Hazelcast Open Source Hazelcast Enterprise
Hazelcast Architecture
Predicate Entry Processor
High-Density (HD) Memory Store
Continuous
Query
HD Near Cache
Open Client
Network Protocol
Hot Restart Store*
* Coming in 3.6
Web Sessions

13. Web Session Replication

14. Web Session Replication
• Web Session Replication is replicating web session
to other members of the cluster each time there is a
change in the session data.

15. Use Case

16. Use Case

17. Use Case

18. Deployment Options
Great for early stages of rapid
application development and iteration
Necessary for scale up or scale out
deployments – decouples
upgrading of clients and cluster for
long term TCO
Embedded Hazelcast
Hazelcast Node
1
Applications
Java API
Client-Server Mode
Hazelcast
Node 3
Java API
Applications
Java API
Applications
Java API
Applications
Hazelcast
Node 2
Hazelcast
Node 1
Hazelcast Node
2
Applications
Java API
Hazelcast Node
3
Applications
Java API

19. Generic Web Session Replication
• Filter Based
• Servlet Container Agnostic
• Runs on any container that supports Servlet 3.0
• Configured in “web.xml”
• Spring Security Support
• Client/P2P Mode
• Deferred write
• Sticky/Non-Sticky session support

20. Configuration
<filter>
<filter-name>hazelcast-filter</filter-name>
<filter-class>com.hazelcast.web.WebFilter</filter-class>
<init-param>
<param-name>map-name</param-name>
<param-value>my-sessions</param-value>
</init-param>
<init-param>
<param-name>sticky-session</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>hazelcast-filter</filter-name>
<url-pattern>/*</url-pattern>
<dispatcher>FORWARD</dispatcher>
<dispatcher>INCLUDE</dispatcher>
<dispatcher>REQUEST</dispatcher>
</filter-mapping>
<listener>
<listener-class>com.hazelcast.web.SessionListener</listener-class>
</listener>

21. Tomcat Session Replication
• Tomcat 6, 7 & 8
• Easy to set up
• No need to modify applications
• Put a <Listener> element into the file $CATALINA_HOME$/conf/
server.xml
• Put a <Manager> element into the file $CATALINA_HOME$/conf/
context.xml

22. Jetty Session Replication
• Jetty 7,8 & 9

23. Demo

24. Thank you