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For example, if OAR = {1, 2, 3} and RAR = {4,5,6}, the values in the assigned replica (AR) and leader/isr path in ZK may go through the following transition.
AR leader/isr
{1,2,3} 1/{1,2,3} (initial state)
AR leader/isr
{1,2,3} 1/{1,2,3} (initial state)
{1,2,3,4,5,6} 1/{1,2,3} (step 2)
{1,2,3,4,5,6} 1/{1,2,3,4,5,6} (step 24)
{1,2,3,4,5,6} 4/{1,2,3,4,5,6} (step 7)
{1,2,3,4,5,6} 4/{1,2,3,4,5,6} (step 7)
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