From 63c89af46570d8e07de22f9850d6f3cf73c01345 Mon Sep 17 00:00:00 2001
From: congqixia <congqi.xia@zilliz.com>
Date: Sun, 5 Jan 2025 19:02:54 +0800
Subject: [PATCH] enhance: Use mvcc timestamp as guarantee ts if set (#38980)

When MvccTimestamp is set, it could be used as guarantee timestamp
directly instead of new ts allocated by scheduler reducing the waiting
time when delegator has tsafe lag

Signed-off-by: Congqi Xia <congqi.xia@zilliz.com>
---
 internal/proxy/task_query.go | 1 +
 1 file changed, 1 insertion(+)

diff --git a/internal/proxy/task_query.go b/internal/proxy/task_query.go
index 910227e796135..9e43e1d3ef42b 100644
--- a/internal/proxy/task_query.go
+++ b/internal/proxy/task_query.go
@@ -570,6 +570,7 @@ func (t *queryTask) queryShard(ctx context.Context, nodeID int64, qn types.Query
 	retrieveReq.GetBase().TargetID = nodeID
 	if needOverrideMvcc && mvccTs > 0 {
 		retrieveReq.MvccTimestamp = mvccTs
+		retrieveReq.GuaranteeTimestamp = mvccTs
 	}
 
 	req := &querypb.QueryRequest{