cluster/processRegionHeartbeat:print down peer when the related store…

… is not disconnected

Signed-off-by: Shirly <AndreMouche@126.com>

server/cluster/cluster.go

@@ -1003,6 +1003,19 @@ func (c *RaftCluster) processRegionHeartbeat(region *core.RegionInfo, tracer cor
 		cluster.HandleStatsAsync(c, region)
 	}
 	tracer.OnAsyncHotStatsFinished()
+	// log down peers when the related store is not disconnected.
+	for _, p := range region.GetDownPeers() {
+		store := c.GetStore(p.Peer.StoreId)
+		if store != nil && !store.IsDisconnected() {
+			log.Warn("region has down peer on connected store",
+				zap.Uint64("region-id", region.GetID()),
+				zap.Uint64("store-id", p.Peer.StoreId),
+				zap.String("store last heartbeat ts", store.GetLastHeartbeatTS().Format(time.UnixDate)),
+				zap.Uint64("down-peer", p.Peer.Id),
+				zap.Uint64("down seconds", p.DownSeconds))
+		}
+	}
+
 	hasRegionStats := c.regionStats != nil
 	// Save to storage if meta is updated, except for flashback.
 	// Save to cache if meta or leader is updated, or contains any down/pending peer.