[slurm-users] Upgrade slurm to 19.05.3 from 18.08.7

[Bas van der Vlies]

We have currently version 18.08.7 installed on our cluster and want to 
upgrade to 19.03.3.. So I wanted to start small and installed it one of 
our compute node. Buy if I start the 'slurmd' then our slurmctld will 
complain that:
{{{
2019-11-13T17:49:37.402] error: slurm_unpack_received_msg: Incompatible 
versions of client and server code
[2019-11-13T17:49:37.412] error: slurm_receive_msg [10.10..0.40:32546]: 
Unspecified error
[2019-11-13T17:49:38.413] error: slurm_unpack_received_msg: Invalid 
Protocol Version 8704 from uid=-1 at 10.10.0.40:32548
[2019-11-13T17:49:38.413] error: slurm_unpack_received_msg: Incompatible 
versions of client and server code
}}}


I have read about the RPC protocol:
  * https://slurm.schedmd.com/rpc.html

Can an old `slurmctld` not communicate with a newer `slurmd`? Or is this 
setup supported and something else goes wrong?

Regards

-- 
Bas van der Vlies
| Operations, Support & Development | SURFsara | Science Park 140 | 1098 
XG Amsterdam
| T +31 (0) 20 800 1300  | bas.vandervlies at surfsara.nl | www.surfsara.nl |