Coherence & WebLogic Server integration with Coherence (Active Cache)

Transcription

1 <Insert Picture Here> WebLogic Innovation Seminar Coherence & WebLogic Server integration with Coherence (Active Cache) Duško Vukmanović FMW Principal Sales Consultant

2 Agenda Coherence Overview WebLogic Server & Coherence Active Cache Coherence Management using WebLogic Console Summary & Benefits 2

3 Fundamental Challenges Cluster Scale Out Issues Scaling state is difficult State is heavy and expensive State consistency is difficult to manage Sharing sessions between heterogeneous application servers not possible Increased load on back-end systems Difficult to scale back-end systems Expensive to scale back-end systems Difficult to buffer back-end systems from spiky traffic profile Data demand outpacing data supply Rate of growth outpacing ability to cost effectively scale 3

4 Address Cluster Scale Out Issues Use Coherence Data & Compute Grid Oracle Coherence brokers data supply with data demand Provides a reliable data tier with a single, consistent view of data Enables dynamic data capacity including fault tolerance and load balancing Ensures that data capacity scales with processing capacity 4

5 Coherence Data Grid Uses Caching Applications request data from the Data Grid rather than backend data sources Analytics Applications ask the Data Grid questions from simple queries to advanced scenario modeling Transactions Data Grid acts as a transactional System of Record, hosting data and business logic Events Automated processing based on event 5

6 How Does Coherence Work? Data load-balanced in-memory across a cluster of servers Data automatically and synchronously replicated to at least one other server for continuous availability Single System Image: Logical view of all data on all servers? Servers monitor the health of each other In the event a server fails or is unhealthy, other servers cooperatively diagnose the state The healthy servers immediately assume the responsibilities of the failed server Continuous Operation: No interruption of service or loss of data due when a server fails X 6

7 Coherence Characteristics of the Cluster In Coherence Members share responsibilities (health, services, data ) Completely Peer-to-Peer No Single Points of Bottleneck (SPOBs) No Single Points of Failure (SPOFs) Linearly scalable to hundreds of servers by design Servers form a full mesh No Masters / Slaves etc. Data Grid members work together as a team Designed for commodity switched infrastructures Scalable throughput up to the limit of the backplane 7

8 Coherence Cache Topologies Data Access Topologies Coherence provides many Topologies for Data Management Local, Near, Replicated, Overview, Disk, Off-Heap, Extend (WAN), Extend (Clients) Partitioned Topology 8

9 Coherence Partitioned Cache Topology Partitioned Topology Each member has a portion of the complete data set Data spread and backed up across Members Transparent to developer Members have access to all data All Data locations are known no lookup & no registry! Update Characteristics Synchronous Update Avoids potential Data Loss & Corruption Predictable Performance Backup Partitions are partitioned away from Primaries for resilience No engineering requirement to setup Primaries or Backups Automatically and Dynamically Managed Recovery Characteristics Membership changes (new members added or members leaving) Other members, in parallel, recover / repartition No in-flight operations lost Some latencies (due to higher priority of recovery) Reliability, Availability, Scalability, Performance are the priority Degrade performance of some requests 9

10 Coherence More than Caching Data Store Persistence Write-Through Write-Behind Event Listeners Parallel Querying Continuous Querying Parallel Data Processing Invocations Triggers 10

11 WebLogic Server & Coherence What is ActiveCache? + Integration of Coherence and WebLogic Server The whole is greater than sum of its parts! Coherence*Web SPI Support Coherence DI & Service Aggregation Management and Monitoring 11

12 WebLogic Server & Coherence ActiveCache Session State Management What: Distributed HTTP Session Management Span Applications: Seamlessly share sessions between applications Span Heterogeneous Environments: Share sessions between WebLogic, OAS, WebSphere, JBoss Handle Large Sessions: Store more information within the session Why: Decouple session management from web container Handle more users without adding more application servers Restart/maintain applications/containers without loosing sessions Handle very large sessions efficiently Keep session data coherent under heavy load 12

13 WebLogic Server & Coherence ActiveCache Deployment Models In-Process Session state maintained within app server process Default model for ease of demonstration and evaluation Not recommended for production deployments Out-of-Process Two tiers app server and cache server Session data storage is offloaded from the app server tier Each tier can be scaled independently Default recommendation due to flexibility 13

14 WebLogic Server & Coherence ActiveCache Cluster Node Isolation App-Server Scoped EAR Scoped WAR Scoped All deployed applications in WLS Server instance will be part of one Coherence node All deployed applications within each EAR will be part of one Coherence node Each deployed web applications will be its own Coherence node 14

15 WebLogic Server & Coherence ActiveCache Dependency Injection public class FooServlet extends HttpServlet CacheName ) private NamedCache mynamedcache;. public void service(httpservletrequest request, HttpServletResponse response) throws.. { //no need to instantiate mynamedcache Object value = mynamedcache.get(request.getpar ameter( mykey ); } } <web-app> <resource-ref> <res-ref-name>store-dist</res-ref-name> <res-type>com.tangosol.net.namedcache</res-type> <res-auth>container</res-auth> <mapped-name>mynamedcache</mapped-name> </resource-ref> </web-app> Must deploy ActiveCache shared library Declare dependency on the shared library Declare all DI resource-entries Package coherence-cache-config.xml in modules classpath 15

16 WebLogic Server & Coherence ActiveCache Manageability Coherence Clusters and Coherence Cache Servers are topology constructs in WebLogic Domain WebLogic Tooling support Node Managed Cache Servers WLST Scripting of Active Cache mbeans 16

17 WebLogic Server & Coherence ActiveCache Customizing Cache Servers 17

18 WebLogic Server & Coherence ActiveCache WLST Support WLST Scripting for Managing Clusters and Cache Servers 18

19 WebLogic Server & Coherence ActiveCache Benefits Decouple session management from web container Handle more users without adding more application servers Restart/maintain applications/containers without loosing sessions Handle very large sessions efficiently Manage & Monitor Coherence using WebLogic tools 19

20 Questions 20