retry stale read as stale if leader is not accessible #1534
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issue number : tikv/tikv#17422
It is the extension of the original PR #1509. I have observed that in case of hot regions, leaders are inaccessible and stale reads are retried as follower_follower. I have added a change if leader is not reachable or epoch doesn't mach than retry stale read as stale instead of follower.