Engine Host¶
An engine host is an OMAG Server that hosts one or more governance engines. Governance engines define collections of governance services used to automate governance activity in the digital landscape. The governance services within the governance engines may access third party technology to perform their responsibilities or implement their behavior directly.
The engine host uses a metadata access server to retrieve the definitions of the governance engines and the governance services within them. These definitions are retrieved through the Governance Server OMAS. The Governance Server OMAS also manages the definition of governance action processes that choreograph calls to the services in a governance engine in order to implement technical controls in the governance program.
Multiple engine hosts may run the same governance engine to provide horizontal scalability.
Governance Services¶
Governance services execute a single task. They are short running.
There are ten types of governance services. Related governance services are packaged together in a specific type of governance engine and enabled in one or more Engine Host OMAG Servers. They run in the appropriate Open Metadata Engine Service (OMES) as shown in the table below.
| Governance Service | Description | Governance Engine type | Engine Service |
|---|---|---|---|
| Survey Action Service | Analyses the content of an Asset's real-world counterpart (digital resource) in the digital landscape. (For example, if the asset describes a file, the survey action service analyses the data stored in the file). Results of the analysis are stored in a Survey Report | Survey Action Engine | Survey Action OMES |
| Watchdog Governance Service | Monitors changes to open metadata elements and when certain changes occur (such as the creation of a new Asset) the watchdog service requests action from other governance services by creating either an Engine Action, a Governance Action Process or an Incident Report. | Governance Action Engine | Governance Action OMES |
| Verification Governance Service | Tests the properties of specific open metadata elements to ensure they are set up correctly or do not indicate a situation where governance activity is required. The results returned from the verification service can be used to trigger other governance services as part of a Governance Action Process. | Governance Action Engine | Governance Action OMES |
| Triage Governance Service | Makes decisions on how to handle a specific situation or incident. Often this involves a human decision maker. | Governance Action Engine | Governance Action OMES |
| Remediation Governance Service | Corrects errors in open metadata or the digital landscape it represents. | Governance Action Engine | Governance Action OMES |
| Provisioning Governance Service | Configuring, enabling, provisioning resources in the digital landscape. Often these provisioning services manage the cataloguing of new assets and the lineage between them. | Governance Action Engine | Governance Action OMES |
| General Governance Action Service | Some form of governance activity. | Governance Action Engine | Governance Action OMES |
| Context Event Service | Event management around Context Event. | Context Event Engine | Context Event OMES |
| Repository Governance Service | Performs governance for open metadata repositories such as dynamically maintaining open metadata archives. | Repository Governance Engine | Repository Governance OMES |
Further information
- The capabilities of each of the engine services are described in the engine services.
- Configuring an engine host is described in the Administration Guide.
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