- Description has changed:
Diff:
~~~~
--- old
+++ new
@@ -6,6 +6,10 @@
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.
-
-
-Will update implementation scope soon...
+Implementation scope:
+1)Upon modification of CSI attribute, AMF will send a CSI Set callback to the
component (to which corresponding CSI is assigned) with same HA state. Callback
will contain list of all configured csiattribute name-value pairs (not only the
changed one). If CSI is not assigned, then no callback will be issued.
+Note: AMF spec does not talk about reinvocation of CSI set callback in the
context of csi-attribute modification. But reinvocation of calback with same HA
state information is discussed in case like failure handing in N-Way model AMF
B.04.01 "3.6.4.5 Failure Handling " page 167.
+2)All characteristics associated with a CSI SET callback will be applicable
with respect to invocation of callback like waiting response from component via
saAmfResponse() API and generation of error report if component does not
respond within the configured callbacktimeout.
+3)Feature will be configurable either through amfd.conf or via some attribute
in CSI. It means if the feature is enabled then only AMF will invoke callback
on component. If feature is disabled then existing behaviour will continue
which means change will come into effect via lock/unlock of SI and other
similar means involving reassignment of SI.
+4) Although CLC-CLI commands are idempotents as per spec, modification of CSI
attribture for a NPI component will not lead to re-execution of INSTANTIATE
command for a NPI component. For such a component existing behavior will
continue.
+5)Since all middleware components are sa-aware, this feature will be supported
for MW services also.
~~~~
---
** [tickets:#1553] AMF: Send CsiSetCallback immediately when CSI attributes are
modified (loadbalancing, VM migration usecases)**
**Status:** accepted
**Milestone:** 5.0.FC
**Labels:** VM migration loadbalancer-synchronization
**Created:** Wed Oct 21, 2015 10:03 AM UTC by Mathi Naickan
**Last Updated:** Mon Jan 25, 2016 09:59 AM UTC
**Owner:** Praveen
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.
Implementation scope:
1)Upon modification of CSI attribute, AMF will send a CSI Set callback to the
component (to which corresponding CSI is assigned) with same HA state. Callback
will contain list of all configured csiattribute name-value pairs (not only the
changed one). If CSI is not assigned, then no callback will be issued.
Note: AMF spec does not talk about reinvocation of CSI set callback in the
context of csi-attribute modification. But reinvocation of calback with same HA
state information is discussed in case like failure handing in N-Way model AMF
B.04.01 "3.6.4.5 Failure Handling " page 167.
2)All characteristics associated with a CSI SET callback will be applicable
with respect to invocation of callback like waiting response from component via
saAmfResponse() API and generation of error report if component does not
respond within the configured callbacktimeout.
3)Feature will be configurable either through amfd.conf or via some attribute
in CSI. It means if the feature is enabled then only AMF will invoke callback
on component. If feature is disabled then existing behaviour will continue
which means change will come into effect via lock/unlock of SI and other
similar means involving reassignment of SI.
4) Although CLC-CLI commands are idempotents as per spec, modification of CSI
attribture for a NPI component will not lead to re-execution of INSTANTIATE
command for a NPI component. For such a component existing behavior will
continue.
5)Since all middleware components are sa-aware, this feature will be supported
for MW services also.
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