code review by fei.hong: do modify add the second grade cache check when call ap…

…i error increment five times set data to first grade cache

@@ -76,9 +76,10 @@ class Cache
             if ($node === 'slave') {
                 $incrementKey = self::makeKey('_increment_' . $key, 'slave');
                 $incrementValue = HoodCache::Memcached('slave')->get($incrementKey, 'slave');
-                // 接口调用失败累计5次之后，回填二级缓存数据到一级缓存
+                // 接口调用失败累计5次之后，回填二级缓存数据到一级缓存, 重置计数值为0
                 if (is_int($incrementValue) && $incrementValue > 5) {
                     HoodCache::Memcached('master')->set(self::makeKey($key, 'master'), $result, 300);
+                    HoodCache::Memcached('slave')->set($incrementKey, 0, 3600);
                 } 
                 // 接口调用失败次数累加
                 else {