[jira] [Commented] (RATIS-352) Persist commit index in Raft log.

["Hadoop QA (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/RATIS-352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16674034#comment-16674034 ] 

Hadoop QA commented on RATIS-352:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  0m 24s{color} | {color:blue} Docker mode activated. {color} |
| {color:red}-1{color} | {color:red} patch {color} | {color:red}  0m  4s{color} | {color:red} RATIS-352 does not apply to master. Rebase required? Wrong Branch? See https://yetus.apache.org/documentation/0.5.0/precommit-patchnames for help. {color} |
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|| Subsystem || Report/Notes ||
| Docker | Client=17.05.0-ce Server=17.05.0-ce Image:yetus/ratis:date2018-11-03 |
| JIRA Issue | RATIS-352 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12946188/r352_20181030.patch |
| Console output | https://builds.apache.org/job/PreCommit-RATIS-Build/486/console |
| Powered by | Apache Yetus 0.5.0   http://yetus.apache.org |


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> 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_20181030.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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