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Index
Created by
Gavin McDonald
, last modified by
Anthony Baker
on
Aug 26, 2018
Overview
Apache Geode
is a data management platform that provides real-time, consistent access to data-intensive applications throughout widely distributed cloud architectures.
Geode pools memory, CPU, network resources, and optionally local disk across multiple processes to manage application objects and behavior. It uses dynamic replication and data partitioning techniques to implement high availability, improved performance, scalability, and fault tolerance. In addition to being a distributed data container, Apache Geode is an in-memory data management system that provides reliable asynchronous event notifications and guaranteed message delivery.
Apache Geode is a mature, robust technology originally developed by GemStone
Systems. Commercially available as GemFire™, it was first deployed in the
financial sector as the transactional, low-latency data engine used in Wall
Street trading platforms. Today Apache Geode technology is used by hundreds of
enterprise customers for high-scale business applications that must meet low
latency and 24x7 availability requirements.
Main Concepts and Components
Caches
are an abstraction that describe a node in a Geode distributed system.
Within each cache, you define data
regions
. Data regions are analogous to tables in a relational database and manage data in a distributed fashion as name/value pairs. A
replicated
region stores identical copies of the data on each cache member of a distributed system. A
partitioned
region spreads the data among cache members. After the system is configured, client applications can access the distributed data in regions without knowledge of the underlying system architecture. You can define listeners to receive notifications when data has changed, and you can define expiration criteria to delete obsolete data in a region.
Locators
provide both discovery and load balancing services. You configure clients with a list of locator services and the locators maintain a dynamic list of member servers. By default, Geode clients and servers use port 40404 and multicast to discover each other.
Geode includes the following features:
Combines redundancy, replication, and a "shared nothing" persistence architecture to deliver fail-safe reliability and performance.
Horizontally scalable to thousands of cache members, with multiple cache topologies to meet different enterprise needs. The cache can be distributed across multiple computers.
Asynchronous and synchronous cache update propagation.
Delta propagation distributes only the difference between old and new versions of an object (delta) instead of the entire object, resulting in significant distribution cost savings.
Reliable asynchronous event notifications and guaranteed message delivery through optimized, low latency distribution layer.
Data awareness and real-time business intelligence. If data changes as you retrieve it, you see the changes immediately.
Integration with Spring Framework to speed and simplify the development of scalable, transactional enterprise applications.
JTA compliant transaction support.
Cluster-wide configurations that can be persisted and exported to other clusters.
Remote cluster management through HTTP.
REST APIs for REST-enabled application development.
Rolling upgrades may be possible, but they will be subject to any limitations imposed by new features.
Geode in 5 minutes
How to Get Apache Geode
You can download Apache Geode from the
website
, run a Docker
image
, or install with
homebrew
on OSX. Application developers can load dependencies from
Maven Central
Maven
Gradle
dependencies {
compile "org.apache.geode:geode-core:$VERSION"
Start the cluster
Download Geode by following one of the methods described above, and follow the installation instructions at in the posted manual at
With a path that contains the
bin
directory of the installation, start a locator and server:
$ gfsh
gfsh> start locator
gfsh> start server
Create a region:
gfsh> create region --name=hello --type=REPLICATE
Write a client application (this example uses a
Gradle
build script):
src/main/java/HelloWorld.java
import java.util.Map;
import org.apache.geode.cache.Region;
import org.apache.geode.cache.client.*;
public class HelloWorld {
public static void main(String[] args) throws Exception {
ClientCache cache = new ClientCacheFactory()
.addPoolLocator("localhost", 10334)
.create();
Region
.
.create("hello");
region.put("1", "Hello");
region.put("2", "World");
for (Map.Entry
System.out.format("key = %s, value = %s\n", entry.getKey(), entry.getValue());
cache.close();
Build and run the
HelloWorld
example.
$ gradle run
The application will connect to the running cluster, create a local cache, put
some data in the cache, and print the cached data to the console:
key = 1, value = Hello
key = 2, value = World
Finally, shutdown the Geode server and locator:
gfsh> shutdown --include-locators=true
For more information see the
Geode Examples
repository or the
documentation
Application Development
Geode applications can be written in these client technologies:
a number of client technologies:
Java
client
or
peer
Java using the Geode client API or embedded using the Geode peer API
.Net and C++ via the
Native Client
REST
Redis
memcached
The following libraries are available external to the Apache Geode project:
Spring Data Geode
Spring Cache
Python
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