Attached file is amfd trace that shows how a duplicated node mapped to SUs
Before headless, the node<->su map as below:
SU1: PL3, SU2: PL4, SU3: PL5, SU4: SC1, SU5: SC2
After headless, the nodes read from IMM and initialization phase was reverted
in order, thus the node <-> su map was changed:
SU5: PL3, SU4: PL4, SU3: PL5, SU2: SC1, SU1: SC2
At the headless sync phase, the node of SU2 was updated to PL4, because SU2 was
actually mapped to PL4 before headless, eventually it becomes SU2: PL4 and SU4:
The problem happens due to some reasons that order of SU read from IMM reverted
and saAmfSUHostedByNode was empty which caused amfd pick randomly the node to
assign to SU.
A solution could be:
(1) Make both active/standby amfd become early implementer/applier so that
saAmfSUHostedByNode was read properly after headless
Or, (2) Just before reading headless sync information, amfd read (again)
saAmfSUHostedByNode and update to SU. At this point, saAmfSUHostedByNode should
be read as non-empty value and the saAmfSUHostedByNode was mapped in
initialization phase is not reliable.
(5.9 MB; application/octet-stream)
** [tickets:#2112] amfd: multiple SUs incorrectly assigned to single node**
**Created:** Tue Oct 11, 2016 11:56 PM UTC by Gary Lee
**Last Updated:** Wed Oct 12, 2016 02:16 AM UTC
**Owner:** Minh Hon Chau
Multiple SUs are assigned to a single node after SC absence.
0) load nwayactive demo
1) stop SCs
2) restart SCs
The following is observed:
root@SC-1:~# immlist safSu=SU4,safSg=AmfDemo,safApp=AmfDemo2
root@SC-1:~# immlist safSu=SU2,safSg=AmfDemo,safApp=AmfDemo2
SU2 is indeed assigned to PL-4, but SU4 was assigned to one of the SCs and is
not assigned to PL-4.
Operations on SU4 will lead to a crash of amfnd on PL-4.
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