-// The pull list manager is responsible for pulling blocks from other
-// Keep servers to ensure replication. When Keep receives a new "pull
-// list" from Data Manager, the pull manager is responsible for fetching
-// blocks on the list.
-var pullmgr *pull_list.Manager
+// The pull list manager and trash queue are threadsafe queues which
+// support atomic update operations. The PullHandler and TrashHandler
+// store results from Data Manager /pull and /trash requests here.
+//
+// See the Keep and Data Manager design documents for more details:
+// https://arvados.org/projects/arvados/wiki/Keep_Design_Doc
+// https://arvados.org/projects/arvados/wiki/Data_Manager_Design_Doc
+//
+var pullq *WorkQueue
+var trashq *WorkQueue