CohQL - Ansi-style query language with a console for adhoc queries.Integration with Databases - Database and third party data integration withĬacheStores, including both synchronous or asynchronous writes.Navigate the serialized form for optimized queries, aggregations, or data processing. Portable Object Format - Optimized serialization format, with the ability to.NET clients - Access the same NamedMap API from either C++ or. On the same partition, potentially across different maps. Partition local transactions - Ability to perform scalable transactions byĪssociating data (thus being on the same partition) and manipulating other entries.To execute processing logic for the appropriate entries with exclusive access. Data local processing - Ability to send a function to the relevant storage node.On all storage nodes, and results streamed back to the client for aggregation of Aggregations - A map/reduce style aggregation where data is aggregated in parallel.Or entries with potential to optimize performance with indices. Queries - Distributed, parallel query evaluation to return matching key, values,.Predicate and is kept in sync, real time. ViewCaches - Locally stored view of remote data that can be a subset based on a.Invalidated upon changes in the storage tier. NearCaches - Locally cached data based on previous requests with local content.Mutations, partition transfer, failover, and so on. EventInterceptors (either sync or async) to be notified storage level events, including.MapListeners to asynchronously notify clients of changes to data.Fundamental key-based access: get/put getAll/putAll.Generally the PartitionedService, and is the entry point to store, retrieve,Ĭoherence Maps provide a number of features: A map is representedīy an implementation of NamedMap. In the majority of cases, customers deal with maps. To be aware of are PartitionedService, InvocationService, and ProxyService. Interact with directly, but is important to be aware of.Ĭoherence services build on top of the cluster service. While this feature hasīeen discussed here, it certainly is not something that customers, generally, Note: This part of the Coherence product has been in production for more that 10 years,īeing the subject of some extensive and imaginative testing. Thus enabling those services to react accordingly. This service, referred to as 'service 0' internally,Įnsures that the mesh of members is maintained and responsive, taking action to collaborativelyĮvict, shun, or in some cases, voluntarily depart the cluster when deemed necessary.Īs members join and leave the cluster, other Coherence services are notified, Overviewįirst and foremost, Coherence provides a fundamental service that is responsibleįor all facets of clustering and is a common denominator / building block for all You can also get Coherence from the official GitHub Packages site.Įdition, see Oracle Technology Network. The natural place to consume this dependency is from Maven: Downloading Coherence Community EditionĪs Coherence is generally embedded into an application by using Coherence APIs, Numerous other features, enable Coherence to be used as a framework for writing robust,ĭistributed applications. To query, aggregate (map/reduce style) and compute (send functions to storage nodesįor locally executed mutations) the data set. The Coherence interface NamedMap (an extension of Map) provides methods To truly harness the CPU resources of the machines. Processes, machines, racks, and data centers but also to perform grid-based processing This partitioning enablesĪpplications to not only distribute (and therefore scale) their storage across multiple (or sharded) across a number of designated remote nodes. Interface but rather than storing the associated data in the local process it is partitioned Novel features in death detection, application data evolvability, and the robust,īattle-hardened core of the product that enables it to be seamlessly deployed andĪt a high level, Coherence provides an implementation of the familiar Map Typically these deployments do not tolerate any downtime and Coherence is chosen due to its Industries such as critical financial trading systems, high performance telecommunication The product is used at scale, for both compute and raw storage, in a vast array of Oracle Coherence Community Edition ContentsĬoherence is a scalable, fault-tolerant, cloud-ready,ĭistributed platform for building grid-based applications and reliably storing data.
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