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NOTE
The balancer window must be sufficient to complete the migration of all data inserted during the day.
As data insert rates can change based on activity and usage patterns, it is important to ensure that the balancing window you select will be sufficient to support the needs of your deployment.
Do not use the sh.startBalancer() method when you have set an activeWindow.

上面是官方的警告：
我就想知道，如果在设置窗口的时间段没有完成数据迁移，当时间到达时，正在数据迁移会有什么后果。

请讲解下