From 50c26c113a9e26984114e12922f247ad4d4621a5 Mon Sep 17 00:00:00 2001
From: ti-srebot <66930949+ti-srebot@users.noreply.github.com>
Date: Fri, 17 Dec 2021 18:30:38 +0800
Subject: [PATCH] copr: avoid NPE when store is not available when balance
 batch cop task (#28110) (#28138)

---
 store/copr/batch_coprocessor.go | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/store/copr/batch_coprocessor.go b/store/copr/batch_coprocessor.go
index eb01ebbbbdaa6..8b8b02af407ee 100644
--- a/store/copr/batch_coprocessor.go
+++ b/store/copr/batch_coprocessor.go
@@ -155,7 +155,11 @@ func balanceBatchCopTask(ctx context.Context, kvStore *tikv.KVStore, originalTas
 				}, 2*time.Second)
 
 				if err != nil || !resp.Resp.(*mpp.IsAliveResponse).Available {
-					logutil.BgLogger().Warn("Cannot detect store's availability", zap.String("store address", s.GetAddr()), zap.String("err message", err.Error()))
+					errMsg := "store not ready to serve"
+					if err != nil {
+						errMsg = err.Error()
+					}
+					logutil.BgLogger().Warn("Store is not ready", zap.String("store address", s.GetAddr()), zap.String("err message", errMsg))
 					mu.Lock()
 					mppStoreLastFailTime[s.GetAddr()] = time.Now()
 					mu.Unlock()