tikv / tikv/pd

Consider use copyset to enhance data safety.

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component/schedule epic/co-availability status/discussion-wanted
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Description

The main idea is to split stores into different replication groups, called 'copyset'. When we calculate the placement of a region, we choose stores belong to a same copyset.

There are some issues need to consider, such as balance between copysets, change of the number of replica.

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