Kit Hui updated RATIS-208:
    Attachment: r208_20180410b.patch

> Allow client to specify replication level in a request
> ------------------------------------------------------
>                 Key: RATIS-208
>                 URL: https://issues.apache.org/jira/browse/RATIS-208
>             Project: Ratis
>          Issue Type: New Feature
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: Kit Hui
>            Priority: Major
>         Attachments: r208_20180410.patch, r208_20180410b.patch
> In Raft protocol, the leader sends a reply to client once the request is 
> committed and applied to its state machine.  A request is committed when the 
> leader get a majority of responses from all the members in the raft group.
> In some applications, the client may want to wait for all member responses 
> instead of a majority.  For example, the application wants to support reading 
> even if there is only one machine remaining in the group.

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