How to delete all tickets in OM

site/content/en/docs/FAQ/_index.md

@@ -0,0 +1,7 @@
+---
+title: "FAQ"
+linkTitle: "FAQ"
+weight: 6
+description: >
+  This guide walks through the frequently asked questions about Open Match.
+---

site/content/en/docs/FAQ/backfill.md

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+---
+title: "How to do backfill"
+linkTitle: "How to do backfill"
+weight: 3
+description: >
+  This guide provides guidance about how to How to do backfill in Open Match.
+---
+
+WIP

site/content/en/docs/FAQ/delete_all.md

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+---
+title: "How to delete all tickets"
+linkTitle: "How to delete all tickets"
+weight: 3
+description: >
+  This guide provides guidance about how to delete all tickets in Open Match.
+---
+
+Open Match does not provides a `DeleteAll` API for users who want to delete all tickets in Open Match. However, starting from Open Match v0.10.0, we recommend using the `QueryTicketIds` API to query and delete all tickets. Here is a code snippet for the recommended usage.
+
+```go
+// Connect to QueryService.
+qc, err := grpc.Dial(queryServiceAddr, grpc.WithInsecure())
+if err != nil {
+    log.Fatalf("Failed to connect to Open Match, got %s", err.Error())
+}
+defer qc.Close()
+
+q := pb.NewQueryServiceClient(conn)
+
+fc, err := grpc.Dial(queryServiceAddr, grpc.WithInsecure())
+if err != nil {
+    log.Fatalf("Failed to connect to Open Match, got %s", err.Error())
+}
+defer fc.Close()
+
+f := pb.NewQueryServiceClient(conn)
+
+
+// an empty pool returns all ticket ids in Open Match
+stream, err := qc.QueryTicketIds(context.Background(), &pb.QueryTicketIdsRequest{})
+
+ids := []string{}
+for {
+    resp, err := stream.Recv()
+    if err == io.EOF {
+        break
+    }
+    if err != nil {
+        // process the error
+    }
+
+    ids = append(ids, resp.GetIds()...)
+}
+
+for _, id := range ids {
+    _, err = f.DeleteTicket(context.Background(), &pb.DeleteTicketRequest{TicketId: id})
+    if err != nil {
+        // process the error
+    }
+}
+```