Robert Levas created AMBARI-21809:
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Summary: Pre-configure services during stack upgrade if Kerberos
is enabled to reduce number of core service restarts when services are added
Key: AMBARI-21809
URL: https://issues.apache.org/jira/browse/AMBARI-21809
Project: Ambari
Issue Type: Task
Components: ambari-server
Affects Versions: 2.6.0
Reporter: Robert Levas
Assignee: Robert Levas
Fix For: 2.6.0
Pre-configure (certain) services during a stack upgrade to HDP 2.6, when
Kerberos is enabled, to reduce number of core service restarts when services
are added.
Services to pre-configure include:
* Knox
* Beacon
While upgrading the stack (EU or RU), processing the relevant Kerberos
descriptor to find services marked to be _pre-configured_. When a tagged
service is encountered, process it if it is not installed. Apply only
configuration changes for existing configuration types. This will set at least
the core-site changes related to proxyuser and auth-to-local rules properties.
By doing this, if a tagged service is later installed, the settings will
already be in place in the existing service configs and thus the existing
services will not need to be restarted.
Caveats:
* Default values for the uninstalled, tagged, services will be assumed
* The stack advisor will be used to suggest locations of components - used to
build the clusterHostInfo structure that may be used to derive property values.
Note: This processing is to occur when upgrading the stack from HDP 2.5 to HDP
2.6.
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