- **status**: assigned --> review
---
** [tickets:#2978] mdstest: tet_svc_subscr_VDEST_11() sometimes fail with TIPC
transport**
**Status:** review
**Milestone:** 5.18.12
**Created:** Thu Nov 29, 2018 08:22 AM UTC by Thuan
**Last Updated:** Thu Nov 29, 2018 08:22 AM UTC
**Owner:** Thuan
MDS TEST Suite 4 test 11 (tet_svc_subscr_VDEST_11) sometimes fail with TIPC
transport
-------- Test failure log (added some debug log) ----------------
Subscribing for the services
MDS SERVICE SUBSCRIBE is SUCCESSFULL
Changing the role of vdest to active
VDEST_CHANGE ROLE to 1 is SUCCESSFULL
Retrieving the events
The Subscriber Service id = 500 is on ADEST
UP: Subscribed Svc = 600 with svc pvt ver = 1 is UP on dest= <3e9> anchor= <0>
role= 1 with PWE id = 1 on node = 2010f
The Subscriber Service id = 500 is on ADEST
NO ACTIVE: Received NO ACTIVE Event
In the system no active instance of Subscribed srv= 600 with svc pvt ver = 1
on dest= <3e9> found
The Subscriber Service id = 500 is on ADEST
DOWN: Subscribed Svc = 600 with svc pvt ver = 1 is DOWN on dest= <3e9> anchor=
<0> role= 2 with PWE id = 1 on node = 0
The Subscriber Service id = 500 is on ADEST
NEW ACTIVE: Received NEW_ACTIVE Event
In the system atleast one active instance of Subscribed service = 600 with svc
pvt ver = 1 on destinatin = <3e9> found
The Subscriber Service id = 500 is on ADEST
UP: Subscribed Svc = 700 with svc pvt ver = 2 is UP on dest= <3e9> anchor= <0>
role= 1 with PWE id = 1 on node = 2010f
MDS RETRIEVE is SUCCESSFULL
Verifying for the versions for UP event
gl_tet_adest.svc[0].svc_id=500
subscr_count=2
svcevt[0].svc_id=600 .event=2 .rem_svc_pvt_ver=1
False: req_svc_id=600, change=3, svc_pvt_ver=1 // expect UP but got NEW ACTIVE
svcevt[1].svc_id=700 .event=3 .rem_svc_pvt_ver=2
Fail
============================================================================
Analysis
ERR flow
--------------------
subscribe then change vdest to active
up 600 role active // user cb UP
up 600 role standby // user cb NO_ACTIVE
up 700 role standby
down 600 role standby // user cb DOWN
up 600 role active // user cb NEW_ACTIVE
up 700 role active // user cb UP
down 700 role standby // Discard (ROLE MISMATCH)
up 700 role active // Discard (Duplicate)
---------------------
600: UP -> NO_ACTIVE -> DOWN -> NEW_ACTIVE (but test expect UP)
700: UP (same test expect)
OK flow
------------------
500 subscribe 600,700
up 600 role standby
up 700 role standby
(add sleep 1s before) change vdest to active
up 600 role active // user cb UP
down 600 role standby // skip as ROLE MISMATCH
up 600 role active // Discard (Duplicate)
up 700 role active // user cb UP
down 700 role standby // Discard (ROLE MISMATCH)
up 700 role active // Discard (Duplicate)
--------------------
600: UP (same test expect)
700: UP (same test expect)
============================================================================
The problem is TIPC published event received is not as order MDS service install
service 600 got published role active before role standby even install role
standby before role active.
The simplest and safe solution is add sleep 1s before change vdest role active.
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