shiny - Terminating (graciously) MonetDB process in R -

i'm using monetdb on variety of platform (e.g. os x , linux centos) shiny application.

it difficult disconnect db times, approach terminate shiny app without disconnecting db.

this means shiny app before accessing data tries stop "old" process with:

monetdb.server.stop(pid) 

from source of command understand kills process associated pid provided (which means among other things user running app must have access kill function).

this works ok of times, when try start monetdb again, get

!fatal: gdklockhome: database lock '.gdk_lock' denied  warning in socketconnection(host = host, port = port, blocking = true, open = "r+b",  :   localhost:50000 cannot opened error in socketconnection(host = host, port = port, blocking = true, open = "r+b",  :    cannot open connection 

is there way avoid error (without forcibly disconnecting database time use in shiny)?

it can indeed take couple of seconds monetdb shut down. if new process started on same dbfarm directory in meantime, !fatal: gdklockhome: database lock '.gdk_lock' denied error. i'm considering adding wait parameter monetdb.server.stop.

so in meantime, waiting bit before server started again idea. otherwise, consider using monetdbd manage monetdb servers.