public GameSession withMatchmakerData(String matchmakerData) {
        setMatchmakerData(matchmakerData);
        return this;
    }
<p>
Information about the matchmaking process that resulted in the game session, if matchmaking was used. Data is in
JSON syntax, formatted as a string. Information includes the matchmaker ID as well as player attributes and team
assignments. For more details on matchmaker data, see <a
href="https://docs.aws.amazon.com/gamelift/latest/flexmatchguide/match-server.html#match-server-data">Match
Data</a>. Matchmaker data is updated whenever new players are added during a successful backfill (see <a
href="https://docs.aws.amazon.com/gamelift/latest/apireference/API_StartMatchBackfill.html"
>StartMatchBackfill</a>).
</p>

@param matchmakerData
       Information about the matchmaking process that resulted in the game session, if matchmaking was used. Data
       is in JSON syntax, formatted as a string. Information includes the matchmaker ID as well as player
       attributes and team assignments. For more details on matchmaker data, see <a
       href="https://docs.aws.amazon.com/gamelift/latest/flexmatchguide/match-server.html#match-server-data"
       >Match Data</a>. Matchmaker data is updated whenever new players are added during a successful backfill
       (see <a href="https://docs.aws.amazon.com/gamelift/latest/apireference/API_StartMatchBackfill.html">
       StartMatchBackfill</a>).
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-gamelift/src/main/java/com/amazonaws/services/gamelift/model/GameSession.java