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(Books Online description: “Occurs when a task is currently performing CLR execution and waiting for another task to end. This wait state occurs when there is a join between tasks.”)
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Added in SQL Server version:
Removed in SQL Server version:
Extended Events wait_type value:
Maps to the CLR_TASK_JOIN map_value in sys.dm_xe_map_values (thanks to Jonathan’s post here).
The map_key value in sys.dm_xe_map_values is 214 in 2008 and 2008 R2, 221 in 2012, and 228 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.
Known occurrences in SQL Server (list number matches call stack list):
Abbreviated call stacks (list number matches known occurrences list):