From bbdd1dbef9f8966d95b6730649fcf6043a9dfe7c Mon Sep 17 00:00:00 2001
From: shaoyue <shaoyue.chen@zilliz.com>
Date: Tue, 30 Nov 2021 16:58:14 +0800
Subject: [PATCH] [skip ci] Add comment for etcd_kv.go (#12449)

Signed-off-by: shaoyue.chen <shaoyue.chen@zilliz.com>
---
 internal/kv/etcd/etcd_kv.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/internal/kv/etcd/etcd_kv.go b/internal/kv/etcd/etcd_kv.go
index e3c92a1662..2637222df4 100644
--- a/internal/kv/etcd/etcd_kv.go
+++ b/internal/kv/etcd/etcd_kv.go
@@ -308,6 +308,7 @@ func (kv *EtcdKV) WatchWithPrefix(key string) clientv3.WatchChan {
 	return rch
 }
 
+// WatchWithRevision starts watching a key with revision, returns a watch channel.
 func (kv *EtcdKV) WatchWithRevision(key string, revision int64) clientv3.WatchChan {
 	start := time.Now()
 	key = path.Join(kv.rootPath, key)
@@ -316,6 +317,7 @@ func (kv *EtcdKV) WatchWithRevision(key string, revision int64) clientv3.WatchCh
 	return rch
 }
 
+// MultiRemoveWithPrefix removes the keys with given prefix.
 func (kv *EtcdKV) MultiRemoveWithPrefix(keys []string) error {
 	start := time.Now()
 	ops := make([]clientv3.Op, 0, len(keys))
@@ -331,6 +333,7 @@ func (kv *EtcdKV) MultiRemoveWithPrefix(keys []string) error {
 	return err
 }
 
+// MultiSaveAndRemoveWithPrefix saves kv in @saves and removes the keys with given prefix in @removals.
 func (kv *EtcdKV) MultiSaveAndRemoveWithPrefix(saves map[string]string, removals []string) error {
 	start := time.Now()
 	ops := make([]clientv3.Op, 0, len(saves))
@@ -414,6 +417,7 @@ func (kv *EtcdKV) CompareVersionAndSwap(key string, version int64, target string
 	return nil
 }
 
+// CheckElapseAndWarn checks the elapsed time and warns if it is too long.
 func CheckElapseAndWarn(start time.Time, message string) bool {
 	elapsed := time.Since(start)
 	if elapsed.Milliseconds() > 2000 {