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Chapter 3. Data Grid for OpenShift
3.1. Data Grid for OpenShift 8.0 Images
Data Grid 8.0 includes two container images, the Data Grid Operator image and Data Grid server image.
Red Hat supports Data Grid for OpenShift 8.0 only through Data Grid Operator subscriptions.
Likewise Red Hat does not support customization of any 8.0 images from the Red Hat Container Registry.
Data Grid for OpenShift images are hosted on the Red Hat Container Registry, where you can find health indexes for the images along with information about each tagged version.
3.2. Data Grid Library Mode on OpenShift
Embedding Data Grid in custom OpenShift applications, or running in Library Mode, is intended for specific uses only.
- Using local or distributed caching in custom Java applications to retain full control of the cache lifecycle. Additionally, when using features that are available only with embedded Data Grid such as distributed streams.
- Reducing network latency to improve the speed of cache operations. Although it is worth noting that the Hot Rod protocol provides near-cache capabilities that achieve equivalent performance of a standard client-server architecture.
Embedding Data Grid in OpenShift also has some limitations:
- Persist cache stores are not currently supported.
-
Only
DNS_PINGis supported for the cluster discovery protocol. -
TCPis supported for the ping port. -
UDPis not supported with embedded Data Grid.
Red Hat highly discourages embedding Data Grid to build custom caching servers to handle remote client requests. You should create Data Grid service clusters with the Data Grid Operator instead to get full Red Hat support and benefit from regular updates with performance improvements and security fixes.
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