[jira] [Created] (RATIS-1701) Add readIndex RPC

[Song Ziyang (Jira)]

Song Ziyang created RATIS-1701:
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             Summary: Add readIndex RPC
                 Key: RATIS-1701
                 URL: https://issues.apache.org/jira/browse/RATIS-1701
             Project: Ratis
          Issue Type: Sub-task
            Reporter: Song Ziyang
            Assignee: Song Ziyang


Add readIndex RPC.

When a follower receives a read request, it first asks leader's readIndex 
through this RPC.



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