Need to boil an ocean? The taskbot library can help you put the MarkLogic Task Server to work. Simple map-reduce functions helps you farm out as many tasks as your MarkLogic cluster can handle, with as much concurrency as you need.
Get the job done.
Taskbot is basically a map-reduce utility. Start with an anonymous function, and a list of stuff: document URIs, or anything else. Taskbot spawns a task for each segment of the list, using a size you specify. You provide an anonymous function that processes each segment. The Task Manager queue and thread pool manage the work, providing as much data-driven parallelism as the configuration and the workload allow.
If the anonymous function updates the database, your work is done. If your function returns results, supply $tb:OPTIONS-SYNC and reduce the results however you like.