The problem:
============
A switchover of controller nodes is defined as 'complete' when AMF sets the RDA
role of the controllers. During a switchover, AMF first swaps the role of the
2N components of the middleware 2N SU and subsequently sets the rda role.
A situation when swithchover is in progress and the old ACTIVE dies must be
treated/escalated as a failover, but currenlty FM is not acting upon the node
down indiciation of the old ACTIVE controller because FM is assuming that this
node is already ACTIVE and so does not takes actions related to failover.
The reason for is that FM is storing rda role and AMF state in the same
variable.
Now, due to this(same varible) when switchover is in progress, AMF would have
asked FM to go active via the csisetcallback, but when AMF has not yet changed
the RDA role, FM fails to act on a NODE down indication of old ACTIVE because
FM is assuming that this node is already fully active, but in reality this node
is not ACTIVE completely.
In reality this is a situation where the old active has died, and this
controller has not fully transitioned to new ACTIVE.
The reason why FM is not acting is because of if-else conditions built around
one variable(that represents both rda and amf role) in the controller node_DOWN
processing.
The solution:
=============
This patch enables FM to set RDA role when failover occurs in the middle of
switchover.
FM subscribes for RDA callback and stores rda and FM role in different
variables.
FM will rely on the RDA role to determine whether it is a fully
functional ACTIVE or not and will thus be able to perform FAILOVER actions
upon receiving the node down indication of the peer controller.
Upon node down of peer controller, do rda set role by default,
except in the scenario when both RDA && AMF role are active
comparing with http://hg.code.sf.net/p/opensaf/staging
searching for changes
changeset: 4360:234ee065c01c
branch: opensaf-4.2.x
parent: 4357:74b17f145917
user: [email protected]
date: Thu Jul 25 16:13:10 2013 +0530
summary: fm: set rda role when failover is trigerred in the middle of
switchover [#438]
changeset: 4361:e76ab7bf59ee
branch: opensaf-4.3.x
parent: 4358:3370708be099
user: [email protected]
date: Thu Jul 25 16:14:18 2013 +0530
summary: fm: set rda role when failover is trigerred in the middle of
switchover [#438]
changeset: 4362:ab15ad7f84c0
tag: tip
parent: 4359:14c93b25163e
user: [email protected]
date: Thu Jul 25 16:14:35 2013 +0530
summary: fm: set rda role when failover is trigerred in the middle of
switchover [#438]
---
** [tickets:#438] FM should distinguish AMF and RDA role to determine a
failover in the middle of a switchove**
**Status:** review
**Created:** Fri May 31, 2013 11:06 AM UTC by Mathi Naickan
**Last Updated:** Mon Jul 22, 2013 11:12 AM UTC
**Owner:** Mathi Naickan
cloned from http://devel.opensaf.org/ticket/3052
FM could distinguish AMF and RDA role to determine the need for a failover
during the following to further sanitise the following swithcover scenarios
when the previous active controller goes down:
- a switchover is in progress i.e. SISWAP OF middleware 2NSI is in progress
- a switchover completed, but AMF is yet to set the RDA role.
Refer the discussions of
http://list.opensaf.org/pipermail/devel/2013-March/029725.html
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