revise log

Signed-off-by: yisaer <[email protected]>

domain/sysvar_cache.go

@@ -139,6 +139,8 @@ func (do *Domain) rebuildSysVarCache(ctx sessionctx.Context) error {
 		if sv.HasGlobalScope() {
 			newGlobalCache[sv.Name] = sVal
 
+			oldStatsCacheMemQuota := variable.StatsCacheMemQuota.Load()
+
 			// Call the SetGlobal func for this sysvar if it exists.
 			// SET GLOBAL only calls the SetGlobal func on the calling instances.
 			// This ensures it is run on all tidb servers.
@@ -149,8 +151,10 @@ func (do *Domain) rebuildSysVarCache(ctx sessionctx.Context) error {
 				if err != nil {
 					logutil.BgLogger().Error(fmt.Sprintf("load global variable %s error", sv.Name), zap.Error(err))
 				}
-				if sv.Name == variable.TiDBStatsCacheMemQuota {
-					do.SetStatsCacheCapacity(variable.StatsCacheMemQuota.Load())
+
+				newStatsCacheMemQuota := variable.StatsCacheMemQuota.Load()
+				if sv.Name == variable.TiDBStatsCacheMemQuota && oldStatsCacheMemQuota != newStatsCacheMemQuota {
+					do.SetStatsCacheCapacity(newStatsCacheMemQuota)
 				}
 			}
 		}

statistics/handle/lru_cache.go

@@ -16,6 +16,8 @@ package handle
 
 import (
 	"container/list"
+	"github.com/pingcap/tidb/util/logutil"
+	"go.uber.org/zap"
 	"math"
 	"sync"
 
@@ -391,6 +393,8 @@ func (c *innerItemLruCache) evictIfNeeded() {
 		if c.onEvict != nil {
 			c.onEvict(item.tblID)
 		}
+		logutil.BgLogger().Info("stats cache lru got evicted", zap.Int64("table-id", item.tblID),
+			zap.Bool("isIndex", true), zap.Int64("id", item.id))
 		curr = prev
 	}
 }