Software Environment:

• openLooKeng-manager version (source or binary):
  1.0.0
• OS platform & distribution (eg., Linux Ubuntu 16.04):
  Linux 3.10.0-693.el7.x86_64
• Java version:
  jdk 1.8.0_181

Describe the current behavior

登录openlookeng manager后，总览图表-长时间处于刷新中

Describe the expected behavior

Steps to reproduce the issue

1.openlookeng manager运行几天后,cache 内集群缓存信息clusterCache文件变大
1.登录openlookeng manager
2.进入总览页面
3.页面长时间处于刷新中

Related log/screenshots

Special notes for this issue

/sys_ecs/clusterEchartInfo是获取集群信息的接口，前端会定时调用；
通过F12查看接口调用，集群缓存信息数据量变大后，发现/sys_ecs/clusterEchartInfo?nodeId=-1&queryType=0处于pending