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Paraphrased from the old Service Broker team blog: This wait type is when a thread is waiting for access to the next-hop destination list for a service so it can update or re-prioritize them, due to the addition or removal of a dialog from the service.

(Books Online description: “Occurs when the Service Broker destination list that is associated with a target service is updated or re-prioritized.”)

Questions/comments on this wait type? Click here to send Paul an email, especially if you have any information to add to this topic.

Added in SQL Server version:


Removed in SQL Server version:


Extended Events wait_type value:

The map_key value in sys.dm_xe_map_values is 170 in 2008 and 2008 R2 and 174 in 2012 and 2014 RTM. After 2014 RTM, you must check the DMV to get the latest value as some map_key values have changed in later builds.

Other information:

I have not seen this wait type be a noticeable contention point.

Known occurrences in SQL Server (list number matches call stack list):

  1. TBD

Abbreviated call stacks (list number matches known occurrences list):

  1. TBD