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Cluster Terminology
This topic introduces some of the concepts unique to the cluster creation and communication feature of A-Stack.
| Terminology | Description | Synonym Terms |
|---|---|---|
Network | A collection of A-Stack running instances that communicates (notifications) and keep persistent data store in sync. | Cluster, Clustering |
| Peer | A-Stack running instance that is participating in forming a Network | |
| Node | A-Stack running instance | Peer if participating in forming a network. |
| Group | Logical Name defined to make communication type between a collection of Nodes | |
| Advertise | Send Notifications to peer or group | |
| Replicate | Replication of data (TQL Storage) between nodes or a group of nodes |
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Using AMQP as a cluster transport does have a cost associated with it due to network involving communication with AMQP borker. Sample Test setup will help us understand the performance cost comparison between the two transports.
Test Setup
| Transport | Broker Instance Type | Boroker Verison | Cluster Size | Cluster Relationship | Database |
|---|
| AMQP | AWS EC2 m1.medium | RabbitMQ 3.2.4 | 4 | AdvertiseTo | Remote Postgress RDS |
Successful transactions: 1000
Failed transactions: 0Longest transaction: 0.65Shortest transaction: 0.16| WS | - | - | 4 | AdvertiseTo | Remote Postgress RDS |
Test Results
Cluster Topologies
Choosing the correct data storage strategy depends on the type of application (simple to complex), deployment and interoperability to other platforms. Here are some basic recommended guidelines
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