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Coherence Overview - OFM Canberra July 2014
- 1. Copyright © 2014,Oracle and/or its affiliates. All rights reserved. | Oracle Coherence Overview Damien McAullay Oracle Fusion Middleware July 2014
- 2. Copyright © 2014,Oracle and/or its affiliates. All rights reserved. | Coherence: Core Enterprise Challenges Scaling applications to support growth Offloading and protection of shared services Delivery of information in real time Batch Processing App App Coherence In-Memory Data Grid AppApp App Middleware 2
- 3. Copyright © 2014,Oracle and/or its affiliates. All rights reserved. | Modern Best Practice Caching Architecture Pioneered By Coherence First Generation Cache Solutions Difficult to scale, complex to synchronize, limited capacity Modern Best Practice Cache Solutions Easy to Scale, Clustered, Synchronized, Advanced Capabilities 3
- 4. Copyright © 2014,Oracle and/or its affiliates. All rights reserved. | Application Server with Coherence • Offload session and application data management from the app server tier • Scale tiers independently • Coherence*Web • Decouple session management from web container • Handle more users without adding more application servers • Restart/maintain applications/containers without losing sessions • Handle very large sessions efficiently Scale Session, Cache and Data Grid as Independent Architectural Tier 4
- 5. Copyright © 2014,Oracle and/or its affiliates. All rights reserved. | Partitioned, Fault Tolerant, Self-Healing Cache Coherence Clustered Caching Explained • Cluster of nodes holding % of primary data locally • Back-up of primary data is distributed across all other nodes • Logical view of all data from any node • All nodes verify health of each other • In the event a node is unhealthy, other nodes diagnose state • Unhealthy node isolated from cluster • Remaining nodes redistribute primary and back-up responsibilities to healthy nodes ? 5
- 6. Copyright © 2014,Oracle and/or its affiliates. All rights reserved. | In-Memory Data Grid Data Partitioned Caching • Data load balanced across data grid. • Data/processing scales linearly. • Ownership responsibilities partitioned. • Access/update latency are constant. • Best for large sets of frequently updated data. Unlimited Data and Processing Capacity Applications Process Process Process Process Virtual Load Balancing Coherence Cluster 6
- 7. Copyright © 2014,Oracle and/or its affiliates. All rights reserved. | In-Memory Data Grid Data Partitioned Fault Tolerance • Backups stored on separate machine. • Even distribution of backup responsibilities. • Configurable number of backup copies. • Once-and-only-once processing guarantees. Automatic fault tolerance management Applications Process Process Process Process Virtual Load Balancing Fault Tolerance Management Coherence Cluster 7
- 8. Copyright © 2014,Oracle and/or its affiliates. All rights reserved. | In-Memory Data Grid Replicated Caching • Entire data set is replicated. • Data is stored as native Java object • Data access is immediate. • Updates are replicated across grid. • Best for small sets of static data. Rapid Access to Reference Data Process Process Process Process Replication Data Applications Coherence Cluster 8
- 9. Copyright © 2014,Oracle and/or its affiliates. All rights reserved. | In-Memory Data Grid Data Near Caching • Recently used data is stored locally. • Repeated access local and immediate. • Automatically populated upon data access. • Automatic invalidation of updated data. • Scale tiers independently. Rapid Data Access From Clients Process Process Process Process Virtual Load Balancing Coherence Cluster Application Application Application 9
- 10. Copyright © 2014,Oracle and/or its affiliates. All rights reserved. | Clients, Proxies, and POF • Java, .NET, C++, and REST Clients • Client types – Coherence*Extend (external to cluster) – Compute Clients (Java cluster members) – REST Clients • Portable Object Format (POF) – Highly compressed object format • Stores data more efficiently on data grid • Optimizes network usage – Quick indexing to access individual fields Optimized Native and REST Support REST Client POF Cache Java Client CacheServerTier Coherence Extend .NET Client C++ Client Java Client ProxyTier POF Objects POF Coherence Cluster 10
- 11. Copyright © 2014,Oracle and/or its affiliates. All rights reserved. | Coherence Caching Patterns • Cache Aside - Developer manages cache – Check the cache before reading from data source – Put data into cache after reading from data source – Evict or update cache when updating data source • Read Through/Write Through – All data reads/writes occur through cache – Cache miss causes load from data source – Cache updates written synchronously to data source • Write Behind – All data writes occur through cache – Updates to cache written asynchronously to the data source DAO Cache DAO Cache Cache DAO
- 12. Copyright © 2014,Oracle and/or its affiliates. All rights reserved. | Parallel Processing • Send processing to where the data lives. • Processing in parallel across grid. – Query the Data Grid – Continuous Query Cache – Parallel Processing on the Data Grid – Map/Reduce Aggregation • Once-and-only-once guarantees. • Processing scales with the grid. Querying, Processing, Aggregating in the Data Grid In-Memory Data Grid Process Process Process Process Coherence Cluster Application Processing Unit 12
- 13. Copyright © 2014,Oracle and/or its affiliates. All rights reserved. | Event Notifications • Grid based event notification – Java Bean Model, key and filter based events • Compliments scalable grid processing – Real-time data • “Live Objects” – Objects can respond to own state changes – State always recoverable Support for Event Based Applications In-Memory Data Grid Process Process Process Process Coherence Cluster Application Application Application 13
- 14. Copyright © 2014,Oracle and/or its affiliates. All rights reserved. | Memcached Adaptor • Migrate from Memcached • Use popular Memcached Clients • Leverage Coherence benefits and features – Scalability, availability, and reliability – Data source integration including HotCache – Security • SASL PLAIN authentication mechanism using Coherence JAAS Identity Asserter • Integrates with the Coherence Proxy Security framework for custom authorization. Memcached … Client Cache Memcached Acceptor Memcached Ruby Client POF Serializer CacheServerProxyServer Memcached Java Client Memcached PHP Client 14
- 15. Copyright © 2014,Oracle and/or its affiliates. All rights reserved. | JCache (JSR-107) Support The Standard API for Caching on the Java EE Platform • JSR-107 – Oracle Co-Spec Lead – Unanimously passed in 2014 • Full Support in Coherence – Multiple Cache Topology support – Interoperability with all Coherence clients – Leverage Coherence features and benefits • Server-side processing • HotCache, Multi-Datacenter, etc. 15 Application javax.cache.* API (JSR-107 JCache) Coherence Cache Coherence Cluster Coherence JSR-107 Adapter Coherence API (NamedCache)
- 16. Copyright © 2014,Oracle and/or its affiliates. All rights reserved. | REST Security and Usability Improvements • Secure SSL communications – HTTP basic authentication, client-side certificates – Fine-grained authorization • Query Enhancements – “named queries” – Limit query results – Keyset Retrieval • Pluggable Query Engines Improved Client Integration In-Memory Data Grid Proxy Tier Data Tier 16
- 17. Copyright © 2014,Oracle and/or its affiliates. All rights reserved. | • Detect and reflect database changes in cache in real time • Leverage existing technologies – GoldenGate, TopLink Grid • Broaden applicability/usability of Coherence • No code change Coherence GoldenGate HotCache Real Time Database Updates for Your Apps AppApp App Coherence Batch Process GoldenGate HotCache 17
- 18. Copyright © 2014,Oracle and/or its affiliates. All rights reserved. | Coherence Availability Options • Synchronous and asynchronous backups • Asynchronous backups can improve throughput 40-50% • Tradeoff of availability and consistency against performance Asynchronous Backup Primary BackupClient 1 2 2 3 Asynchronous Backup Primary BackupClient 1 3 2 4 Synchronous Backup 18
- 19. Copyright © 2014,Oracle and/or its affiliates. All rights reserved. | Coherence Availability Options • Multi-Level Backup • Guaranteed backup in case of simultaneous multi-machine failure • Availability and consistency traded off against performance Multiple Backups PrimaryClient Backup Backup Backup Pre-12.1.2 PrimaryClient Backup Backup Backup 12.1.2 19
- 20. Copyright © 2014,Oracle and/or its affiliates. All rights reserved. | Coherence Availability Options • Node safe • Machine safe • Rack safe • Site safe Node, Machine, Site and Rack Safety Rack 2 Machine 5 P4’ P5 Machine 8 P2’ P8 Machine 7 P1’ P7 Machine 6 P3’ P6 MAN Site 1 P1 P2’ Site 2 P2 P1’ Rack 1 Machine 1 P8’ P1 Machine 4 P5’ P4 Machine 3 P6’ P3 Machine 2 P7’ P2 20
- 21. Copyright © 2014,Oracle and/or its affiliates. All rights reserved. | Managed Coherence Servers • Combined WebLogic and Coherence Infrastructure – WebLogic Management Framework – No Extra License Cost for Coherence Users – Configuration Wizard, WebLogic admin console, WLST, Node Manager • Introduces the Grid Archive (GAR) – Package and Deploy • Coherence “standalone” includes support for GARs Administrative and Operational Efficiency WebLogic Console Enterprise Manager WebLogic Scripting Coherence Coherence Coherence Coherence Configure Deploy Start/Stop Monitor WebLogic WebLogic WebLogic Management Framework for Coherence 21
- 22. Copyright © 2014,Oracle and/or its affiliates. All rights reserved. | Enterprise Manager 12c for Coherence Coherence JVM Diagnostics Monitoring Across Coherence Data Grids SLAs for Composite Java/Cache Applications Coherence Configuration Management Provisioning Coherence Diagnostics Images to MOS
- 23. Copyright © 2014,Oracle and/or its affiliates. All rights reserved. | • Controlled at business services level • Fine grained control for composite services • Only cache subset of final result of composite service • Requires no code change • Service results cached using xquery applied to requests • Supports expiration policies Service Result Caching improves response time, offloads services Oracle Service Bus Checkbox Integration 23
- 24. Copyright © 2014,Oracle and/or its affiliates. All rights reserved. | Join the Coherence Community Visit us at: coherence.oracle.com Oracle Coherence Users /OracleCoherence@OracleCoherence blogs.oracle.com/ OracleCoherence /OracleCoherence
- 25. Copyright © 2014,Oracle and/or its affiliates. All rights reserved. | 25