主要问题是，每次都要创建迭代器的一个新副本。
The main problem is that we create a new copy of the iterator every time.
这些服务器可能与主服务器不同步，导致新副本再次被检索。
These servers may not be synchronized with the master server, which could result in new copies being retrieved again.
一个新副本将在集合中的另一个可用设备上自动创建。
A new replica is automatically created on another available appliance in the collective.
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