Tamás Hanicz created KNOX-3526:
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Summary: Redeploy topologies on gateway-reloadable configuration
changes via reloadableListener topology attribute
Key: KNOX-3526
URL: https://issues.apache.org/jira/browse/KNOX-3526
Project: Apache Knox
Issue Type: New Feature
Components: Server
Affects Versions: 3.0.0
Reporter: Tamás Hanicz
Assignee: Tamás Hanicz
Knox reloads gateway-reloadable.xml at runtime when the file changes, but there
is no way for topologies to react to such a change. Topologies that depend on
reloadable configuration keep running with the values they were deployed with
until they are redeployed manually.
We need a listener mechanism on gateway-reloadable configuration updates, and a
per-topology opt-in that redeploys the topology when the reloadable
configuration changes.
h3. Requirements
* gateway-reloadable supports registering listeners that are notified when a
configuration update is detected.
* Topologies get a new attribute, reloadableListener, which defaults to false.
* When reloadableListener is true for a topology and the reloadable
configuration changes, that specific topology is redeployed.
* Topologies with reloadableListener set to false (or not set) are unaffected
by reloadable configuration changes.
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