[jira] [Moved] (RATIS-2296) SCM and OM should not allow changing Raft group size to an even number

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

     [ https://issues.apache.org/jira/browse/RATIS-2296?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tsz-wo Sze moved HDDS-13053 to RATIS-2296:
------------------------------------------

    Component/s: raft-group
                     (was: OM HA)
                     (was: SCM HA)
            Key: RATIS-2296  (was: HDDS-13053)
       Workflow: no-reopen-closed, patch-avail  (was: patch-available, re-open possible)
        Project: Ratis  (was: Apache Ozone)

> SCM and OM should not allow changing Raft group size to an even number
> ----------------------------------------------------------------------
>
>                 Key: RATIS-2296
>                 URL: https://issues.apache.org/jira/browse/RATIS-2296
>             Project: Ratis
>          Issue Type: Improvement
>          Components: raft-group
>            Reporter: Tsz-wo Sze
>            Assignee: Tsz-wo Sze
>            Priority: Major
>
> Setting the Raft group size to an even number for HA does not make sense.  As an example, support group size is 4.  It only can tolerate 1 failure, which is the same as group size 3.  However, It is harder to get the majority comparing to group size 3 -- it requires 3 instead of 2.  
> We should just fail it when setting a Raft group to an even number.



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