Accumulo currently provides mechanisms to initiate bulk imports and to list bulk imports in progress. Scheduling of bulk import requests is not entirely deterministic, and most of the execution of a bulk-import request is done in a non-preemptable manner. As such, any bulk import which takes very long to complete can block bulk imports with higher operational priority for significant periods.
To better support bulk-import-heavy applications, it would be nice if Accumulo would offer additional mechanisms for controlling the scheduling and execution of bulk imports.
One such capability would be the ability to prioritize and re-prioritize bulk import requests. Recent discussions with customers reveal this to be the highest priority on their feature request wish list.