[jira] [Resolved] (RATIS-1677) Do not auto format RaftStorage in RECOVER

["Tsz-wo Sze (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/RATIS-1677?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tsz-wo Sze resolved RATIS-1677.
-------------------------------
    Fix Version/s: 3.0.0
       Resolution: Fixed

The pull request is now merged.

> Do not auto format RaftStorage in RECOVER
> -----------------------------------------
>
>                 Key: RATIS-1677
>                 URL: https://issues.apache.org/jira/browse/RATIS-1677
>             Project: Ratis
>          Issue Type: Improvement
>          Components: server
>            Reporter: Tsz-wo Sze
>            Assignee: Tsz-wo Sze
>            Priority: Major
>             Fix For: 3.0.0
>
>          Time Spent: 1h 10m
>  Remaining Estimate: 0h
>
> A server should never create a new directory unless RaftStorage.StartupOption.FORMAT is specified. Otherwise, it will cause data loss since the raft log committed in that server is (temporarily) lost. Consider the following
> # Server A and Server B were fast and had commit index 100 while server C had commit index 90.
> # The disk of Server A was bad and it was restarted with RECOVER.  Since it cannot access its directory in the bad disk, it created a new directory in another disk.  Then, its commit index was reset and became -1.
> # Server C started a leader election and Server A voted for it. The commit index became 90 – it lost the commits from index 91 to index 100.



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