mongodb分片副本集的config一直刷出如下日志，致使日志暴增；

[wuka]

{"log":"2018-09-13T17:02:44.093+0800 I SHARDING [CatalogCacheLoader-2990] Refresh for collection xxx took 0 ms and found version 1|0||5b971e568712c6065e4d09d3\n","stream":"stdout","time":"2018-09-13T09:02:44.093084865Z"}
{"log":"2018-09-13T17:02:44.093+0800 I SHARDING [Balancer] Refreshing chunks for collection xxx based on version 1|0||5b9981558712c6065e5c36a0\n","stream":"stdout","time":"2018-09-13T09:02:44.093176173Z"}

mongodb版本为3.4.16
balancer不能关闭

想问一下出现这种情况的原因，怎么避免~

[rucypli]

官方jira给出的貌似只能升级版本

[zjcxc]

版本升级也没用