Covert GraphProducer.runningJobs to ConcurrentHashMap to avoid race condition
Covert GraphProducer.runningJobs to ConcurrentHashMap to avoid race condition

graknlabs/grakn,graknlabs/grakn,graknlabs/grakn,lolski/grakn,lolski/grakn,lolski/grakn,graknlabs/grakn,lolski/grakn