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This wait type is when a thread is waiting for more work when seeding a new availability group replica, or in Azure when something triggers a database copy, like changing a service tier or setting up geo-replication.
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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 912 in 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.
I have not seen this wait type be a noticeable source of contention. High wait times indicate that one of the copy threads is waiting for more work.
Known occurrences in SQL Server (list number matches call stack list):
Abbreviated call stacks (list number matches known occurrences list):