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https://issues.apache.org/jira/browse/RATIS-352?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tsz Wo Nicholas Sze updated RATIS-352:
--------------------------------------
    Attachment:     (was: r352_20181025.patch)

> Persist commit index in Raft log.
> ---------------------------------
>
>                 Key: RATIS-352
>                 URL: https://issues.apache.org/jira/browse/RATIS-352
>             Project: Ratis
>          Issue Type: Improvement
>          Components: server
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: Tsz Wo Nicholas Sze
>            Priority: Major
>         Attachments: r352_20181025b.patch
>
>
> Current the commit index is not persisted in the Raft log.  When a server 
> restarts, it cannot apply its log until it has joined a Raft group.  There is 
> no problem if there is a Raft group.  
> However, a server cannot recover its data when formatting a Raft group is 
> impossible (e.g. a majority of servers are dead).  Ideally, a server can 
> safely apply the log up to the commit index.  The JIRA is to persist the 
> commit index so that such recovery is possible.



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