Opportunistic containers

Opportunistic containers can be transmitted to a NodeManager even if their execution at that particular time cannot begin immediately, unlike YARN containers, which are scheduled in a node if and only if there are unallocated resources.

In these types of scenarios, opportunistic containers will be queued at the NodeManager till the required resources are available for use. The ultimate goal of these containers is to enhance the cluster resource utilization and in turn improve task throughput.