bonampak opened a new pull request, #1059:
URL: https://github.com/apache/knox/pull/1059
## What changes were proposed in this pull request?
The Knox Cloudera Manager service discovery can use the new CM API call
`GET /clusters/{clusterName}/services/serviceName}/roles/configs`
if present. This call is using offset-limit pagination with a default value
of 100. The page size used by Knox is set to 500 by default.
To enable this, one can set the properties in gateway-site.xml:
```
gateway.cloudera.manager.service.discovery.role.fetch.strategy=byService
gateway.cloudera.manager.service.discovery.api.version=v57
gateway.cloudera.manager.service.discovery.role.pagesize=300
```
The version and endpoint can be checked in the CM UI (Support/API Explorer)
https://cm-host:7183/static/apidocs/ui/index.html#/RolesResource/readRolesConfig
By default, the original behavior is used, with CM API version v32 and the
calls
- `GET /clusters/{clusterName}/services/{serviceName}/roles`
- `GET
/clusters/{clusterName}/services/{serviceName}/roles/{roleName}/config` (for
each service role)
The default role configuration fetch can be configured by leaving these
parameters empty or setting them to
```
gateway.cloudera.manager.service.discovery.role.fetch.strategy=byRole
gateway.cloudera.manager.service.discovery.api.version=v32
```
## How was this patch tested?
Tested using CM 7.13.1. Verified that the same topologies are generated and
the discovery cache under data/cm-clusters remains the same for both discovery
strategies.
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