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This wait type is when a thread is performing operations as part of a query using the sys.fn_xe_file_target_read_file table-value function to read event data from a file target. Note that this is a preemptive wait so the thread remains on the processor until the operation has completed.
(Books Online description: N/A)
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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 1094 in 2016 RTM. After 2016 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 contention point.
Known occurrences in SQL Server (list number matches call stack list):
- Waiting for event data from the sys.fn_xe_file_target_read_file table-value function during a query
And other similar call stacks for operations with that TVF.
Abbreviated call stacks (list number matches known occurrences list):