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Improve create keyspace performance #10125

@rleungx

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@rleungx

Enhancement Task

When we create a keyspace, we first write a region label to etcd, then wait for the scheduling service to finish the split region operation. But the performance could be limited by the patrol region time. Only when a region is scanned and the split checker will create an operator, which is slow if we have too many regions in a large cluster. One possible way is to add the corresponding region to suspect regions to reduce the time cost of scanning the region.

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