Possibility to terminate services

[mtitov]

How we can control the termination process? - termination command as a part of task description, or special method for service tasks (task.cancel())

p.s. it is needed for Chimbuko app (RECUP project), since some summary/statistics is collected during the termination

[mtitov]

@andre-merzky Example of a set of operations to terminate Chimbuko service

provdb_addr=$(cat chimbuko/provdb/provider.address)
echo "Provenance DB is on ${provdb_addr}"
pserver_addr=$(cat chimbuko/vars/chimbuko_ad_opts.var | sed 's/.*pserver_addr\s\([^ ]\+\).*/\1/')
echo "Pserver is on ${pserver_addr}"
echo "Shutting down pserver"
pshutdown "${pserver_addr}"
sleep 4
echo "Shutting down provDB"
provdb_shutdown "${provdb_addr}"

[andre-merzky]

TODO: check if signal forwarding is standardized for OpenMPI / MPICH / MVAPICH

[mtitov]

Use case SOMA+RCT:

• SOMA needs to dump monitoring data before the termination (which should be triggered by a corresponding RPC call)

[mtitov]

Close in favor #3062