[ClusterLabs] make promoted follow promoted resource ?

[Andrei Borzenkov]

On 26.11.2023 12:32, lejeczek via Users wrote:
> Hi guys.
> 
> With these:
> 
> -> $ pcs resource status REDIS-6381-clone
>     * Clone Set: REDIS-6381-clone [REDIS-6381] (promotable):
>       * Promoted: [ ubusrv2 ]
>       * Unpromoted: [ ubusrv1 ubusrv3 ]
> 
> -> $ pcs resource status PGSQL-PAF-5433-clone
>     * Clone Set: PGSQL-PAF-5433-clone [PGSQL-PAF-5433]
> (promotable):
>       * Promoted: [ ubusrv1 ]
>       * Unpromoted: [ ubusrv2 ubusrv3 ]
> 
> -> $ pcs constraint ref REDIS-6381-clone
> Resource: REDIS-6381-clone
>     colocation-REDIS-6381-clone-PGSQL-PAF-5433-clone-INFINITY
> 
> basically promoted Redis should follow promoted pgSQL but
> it's not happening, usually it does.
> I presume pcs/cluster does something internally which
> results in disobeying/ignoring that _colocation_ constraint
> for these resources.
> I presume scoring might play a role:
>     REDIS-6385-clone with PGSQL-PAF-5435-clone (score:1001)
> (rsc-role:Master) (with-rsc-role:Master)
> but usually, that scoring works, only "now" it does not.
> Any comments I appreciate much.
> thanks, L.
> 
> I looked at pamaker log - snippet below after
> REDIS-6381-clone re-enabled - but cannot see explanation for
> this.
> ...
>    notice: Calculated transition 110, saving inputs in
> /var/lib/pacemaker/pengine/pe-input-3729.bz2
>    notice: Transition 110 (Complete=0, Pending=0, Fired=0,
> Skipped=0, Incomplete=0,
> Source=/var/lib/pacemaker/pengine/pe-input-3729.bz2): Complete
>    notice: State transition S_TRANSITION_ENGINE -> S_IDLE
>    notice: State transition S_IDLE -> S_POLICY_ENGINE
>    notice: Actions: Start      REDIS-6381:0
> (                        ubusrv2 )
>    notice: Actions: Start      REDIS-6381:1
> (                        ubusrv3 )
>    notice: Actions: Start      REDIS-6381:2
> (                        ubusrv1 )
>    notice: Calculated transition 111, saving inputs in
> /var/lib/pacemaker/pengine/pe-input-3730.bz2
>    notice: Initiating start operation REDIS-6381_start_0
> locally on ubusrv2
>    notice: Requesting local execution of start operation for
> REDIS-6381 on ubusrv2
> (to redis) root on none
> pam_unix(su:session): session opened for user redis(uid=127)
> by (uid=0)
> pam_sss(su:session): Request to sssd failed. Connection refused
> pam_unix(su:session): session closed for user redis
> pam_sss(su:session): Request to sssd failed. Connection refused
>    notice: Setting master-REDIS-6381[ubusrv2]: (unset) -> 1000

This is the only line that sets master score, so apparently ubusrv2 is 
the only node where your clone *can* be promoted. Whether pacemaker is 
expected to fail this operation because it violates constraint I do not 
know.

>    notice: Transition 111 aborted by
> status-2-master-REDIS-6381 doing create
> master-REDIS-6381=1000: Transient attribute change
> INFO: demote: Setting master to 'no-such-master'
>    notice: Result of start operation for REDIS-6381 on
> ubusrv2: ok
>    notice: Transition 111 (Complete=4, Pending=0, Fired=0,
> Skipped=1, Incomplete=14,
> Source=/var/lib/pacemaker/pengine/pe-input-3730.bz2): Stopped
>    notice: Actions: Promote    REDIS-6381:0         (
> Unpromoted -> Promoted ubusrv2 )
>    notice: Actions: Start      REDIS-6381:1
> (                        ubusrv1 )
>    notice: Actions: Start      REDIS-6381:2
> (                        ubusrv3 )
>    notice: Calculated transition 112, saving inputs in
> /var/lib/pacemaker/pengine/pe-input-3731.bz2
>    notice: Initiating notify operation
> REDIS-6381_pre_notify_start_0 locally on ubusrv2
>    notice: Requesting local execution of notify operation for
> REDIS-6381 on ubusrv2
>    notice: Result of notify operation for REDIS-6381 on
> ubusrv2: ok
>    notice: Initiating start operation REDIS-6381_start_0 on
> ubusrv1
>    notice: Initiating start operation REDIS-6381:2_start_0 on
> ubusrv3
>    notice: Initiating notify operation
> REDIS-6381_post_notify_start_0 locally on ubusrv2
>    notice: Requesting local execution of notify operation for
> REDIS-6381 on ubusrv2
>    notice: Initiating notify operation
> REDIS-6381_post_notify_start_0 on ubusrv1
>    notice: Initiating notify operation
> REDIS-6381:2_post_notify_start_0 on ubusrv3
>    notice: Result of notify operation for REDIS-6381 on
> ubusrv2: ok
>    notice: Initiating notify operation
> REDIS-6381_pre_notify_promote_0 locally on ubusrv2
>    notice: Requesting local execution of notify operation for
> REDIS-6381 on ubusrv2
>    notice: Initiating notify operation
> REDIS-6381_pre_notify_promote_0 on ubusrv1
>    notice: Initiating notify operation
> REDIS-6381:2_pre_notify_promote_0 on ubusrv3
>    notice: Result of notify operation for REDIS-6381 on
> ubusrv2: ok
>    notice: Initiating promote operation REDIS-6381_promote_0
> locally on ubusrv2
>    notice: Requesting local execution of promote operation
> for REDIS-6381 on ubusrv2
>    notice: Result of promote operation for REDIS-6381 on
> ubusrv2: ok
>    notice: Initiating notify operation
> REDIS-6381_post_notify_promote_0 locally on ubusrv2
>    notice: Requesting local execution of notify operation for
> REDIS-6381 on ubusrv2
>    notice: Initiating notify operation
> REDIS-6381_post_notify_promote_0 on ubusrv1
>    notice: Initiating notify operation
> REDIS-6381:2_post_notify_promote_0 on ubusrv3
>    notice: Result of notify operation for REDIS-6381 on
> ubusrv2: ok
>    notice: Setting master-REDIS-6381[ubusrv3]: (unset) -> 1
>    notice: Transition 112 aborted by
> status-3-master-REDIS-6381 doing create master-REDIS-6381=1:
> Transient attribute change
>    notice: Setting master-REDIS-6381[ubusrv1]: (unset) -> 1
>    notice: Transition 112 (Complete=25, Pending=0, Fired=0,
> Skipped=5, Incomplete=5,
> Source=/var/lib/pacemaker/pengine/pe-input-3731.bz2): Stopped
>    notice: Calculated transition 113, saving inputs in
> /var/lib/pacemaker/pengine/pe-input-3732.bz2
>    notice: Initiating monitor operation
> REDIS-6381_monitor_20000 locally on ubusrv2
>    notice: Requesting local execution of monitor operation
> for REDIS-6381 on ubusrv2
>    notice: Initiating monitor operation
> REDIS-6381_monitor_60000 on ubusrv3
>    notice: Initiating monitor operation
> REDIS-6381_monitor_45000 on ubusrv3
>    notice: Initiating monitor operation
> REDIS-6381_monitor_60000 on ubusrv1
>    notice: Initiating monitor operation
> REDIS-6381_monitor_45000 on ubusrv1
>    notice: Result of monitor operation for REDIS-6381 on
> ubusrv2: promoted
>    notice: Transition 113 (Complete=5, Pending=0, Fired=0,
> Skipped=0, Incomplete=0,
> Source=/var/lib/pacemaker/pengine/pe-input-3732.bz2): Complete
>    notice: State transition S_TRANSITION_ENGINE -> S_IDLE
> 
> 
> 
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