- **labels**: --> VM migration, loadbalancer-synchronization
- **summary**: AMF: Send CsiSetCallback immediately when CSI attributes are
modified --> AMF: Send CsiSetCallback immediately when CSI attributes are
modified (loadbalancing, VM migration usecases)
- **Comment**:
Praveen is pointing out that this ticket could be useful in scenarios involving
VM migration too!
For eg:- As a part of the migration solution, before trigerring the migration,
the CSI attributes can be modified first to let the application(VM) know about
the coordinates(in the form of CSI attributes) of the destination VM.
This information could then be utilized to trigger the start of migration as a
part of a AMF shutdown operation for example!
---
** [tickets:#1553] AMF: Send CsiSetCallback immediately when CSI attributes are
modified (loadbalancing, VM migration usecases)**
**Status:** assigned
**Milestone:** 5.0
**Labels:** VM migration loadbalancer-synchronization
**Created:** Wed Oct 21, 2015 10:03 AM UTC by Mathi Naickan
**Last Updated:** Wed Oct 21, 2015 10:03 AM UTC
**Owner:** Mathi Naickan
AMF is the 'workload' manager in OpenSAF. There are also loadbalancers external
to OpenSAF that can choose to modify some attributes of an application
component's workload which is currently assigned ACTIVE (without loss of
service). In such scenarios it is possible (and necessary) for both AMF and the
external load balancers to throttle each other. The reverse throttling(from AMF
to the external load balancer) is possible based on any changes to the
NodeCapacity limitations set in AMF, but that is for later/future
considerations.
For eg:- Suppose an application component (say modelled in n-way active) is
currently serving traffic originating from a source/target X, based on some
network criteria the load balancer can choose to re-configure/modify that
application to serve traffic from a different source/target Y. Such change in
information related to that workload could be communicated to that application
component at runtime without loss of service.
The above scenario is achieved if the admin (or a loadbalancer) modifies the
attributes of a workload i.e. csiattribute name-value pair, and then the
altered name-value information is communicated to that application or
associated application components 'immediately' instead of waiting for the next
admin operation!
Today AMF supports modifying csi attribute name-value without requiring that SI
to be locked. But the modified attributes are sent only after a subsequent
admin operation. This ticket is intended to evaluate and support sending
CSIsetcallback (with the same CSI state information but modified csi
attributes) immediately.
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