AWS SDK Version 3 for .NET
API Reference

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Finds new players to fill open slots in an existing game session. This operation can be used to add players to matched games that start with fewer than the maximum number of players or to replace players when they drop out. By backfilling with the same matchmaker used to create the original match, you ensure that new players meet the match criteria and maintain a consistent experience throughout the game session. You can backfill a match anytime after a game session has been created.

To request a match backfill, specify a unique ticket ID, the existing game session's ARN, a matchmaking configuration, and a set of data that describes all current players in the game session. If successful, a match backfill ticket is created and returned with status set to QUEUED. The ticket is placed in the matchmaker's ticket pool and processed. Track the status of the ticket to respond as needed. For more detail how to set up backfilling, see Backfill Existing Games with FlexMatch.

The process of finding backfill matches is essentially identical to the initial matchmaking process. The matchmaker searches the pool and groups tickets together to form potential matches, allowing only one backfill ticket per potential match. Once the a match is formed, the matchmaker creates player sessions for the new players. All tickets in the match are updated with the game session's connection information, and the GameSession object is updated to include matchmaker data on the new players. For more detail on how match backfill requests are processed, see How Amazon GameLift FlexMatch Works.

Matchmaking-related operations include:


For .NET Core and PCL this operation is only available in asynchronous form. Please refer to StartMatchBackfillAsync.

Namespace: Amazon.GameLift
Assembly: AWSSDK.GameLift.dll
Version: 3.x.y.z


public abstract StartMatchBackfillResponse StartMatchBackfill(
         StartMatchBackfillRequest request
Type: Amazon.GameLift.Model.StartMatchBackfillRequest

Container for the necessary parameters to execute the StartMatchBackfill service method.

Return Value
The response from the StartMatchBackfill service method, as returned by GameLift.


InternalServiceException The service encountered an unrecoverable internal failure while processing the request. Clients can retry such requests immediately or after a waiting period.
InvalidRequestException One or more parameter values in the request are invalid. Correct the invalid parameter values before retrying.
NotFoundException A service resource associated with the request could not be found. Clients should not retry such requests.
UnsupportedRegionException The requested operation is not supported in the region specified.

Version Information

.NET Framework:
Supported in: 4.5, 4.0, 3.5

Portable Class Library:
Supported in: Windows Store Apps
Supported in: Windows Phone 8.1
Supported in: Xamarin Android
Supported in: Xamarin iOS (Unified)
Supported in: Xamarin.Forms

See Also