WaitForWantedNodes blocks until the nodeDefsWanted in the cfg is equal to or a superset of the provided wantedNodes, and returns the "nodes to remove" (actualWantedNodes SET-DIFFERENCE wantedNodes).

Timeout for CtlMgr's exported APIs.

DefragmentedUtilizationHook allows applications to register a callback to determine the projected "defragmented" utilization stats for the nodes belonging to the service.

An Ctl might be in the midst of controlling a replan/rebalance, where ctl.ctlDoneCh will be non-nil.

CtlMgr implements the cbauth/service.Manager interface and provides the adapter or glue between ns-server's service API and cbgt's Ctl implementation.

CtlOnProgressFunc defines the callback func signature that's invoked during change topology operations.