datasource add/delete not effected until next sync

[Eric K]

If the API is deployed on a separate node from the datasources:
When the API node processes datasource add/delete, it modifies the database and returns success, even though the datasource service has not been created or removed. We give a strange user experience that after adding a datasource returns success, the newly added datasource does not exist or have status until the next periodic sync (default 30 seconds?).

Proposed fix:
add a new datasource_manager service that is automatically started on the dse_node that hosts the datasource services.
On the datasource_model api, instead of calling self.bus.add_datasource/delete_datasource, rpc call the datasource_manager (which may be on the same or different node).

Consider backporting fix to Newton.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/397096

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/newton
Review: https://review.openstack.org/400322

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/397096
Committed: https://git.openstack.org/cgit/openstack/congress/commit/?id=22ce339f23f7311e31796b9a530794c85c095930
Submitter: Jenkins
Branch: master

commit 22ce339f23f7311e31796b9a530794c85c095930
Author: Masahito Muroi <email address hidden>
Date: Mon Nov 14 19:01:10 2016 +0900

    Route datasource add/delete request to datasource node

    API request adding/deleting datasource should be routed to datasource
    node, and then the datasource node creates/removes the requested
    datasource during the request. It enables user to use the datasource
    just after recieving the response of request.

    Change-Id: If365c6d1db9ecc5c578421ad5c362326fc262a78
    Closes-bug: #1638729
    Closes-bug: #1639116

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/400322
Committed: https://git.openstack.org/cgit/openstack/congress/commit/?id=1149270e1fc47f1d3b397f24701e40d213c7efd2
Submitter: Jenkins
Branch: stable/newton

commit 1149270e1fc47f1d3b397f24701e40d213c7efd2
Author: Masahito Muroi <email address hidden>
Date: Mon Nov 14 19:01:10 2016 +0900

    Route datasource add/delete request to datasource node

    API request adding/deleting datasource should be routed to datasource
    node, and then the datasource node creates/removes the requested
    datasource during the request. It enables user to use the datasource
    just after recieving the response of request.

    Change-Id: If365c6d1db9ecc5c578421ad5c362326fc262a78
    Closes-bug: #1638729
    Closes-bug: #1639116

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/congress 5.0.0.0b2 development milestone.

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/congress 4.0.1 release.