[jira] [Updated] (SLIDER-600) RoleHistory to support reloads with different # of roles from current set

["Steve Loughran (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SLIDER-600?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steve Loughran updated SLIDER-600:
----------------------------------
    Issue Type: Sub-task  (was: Improvement)
        Parent: SLIDER-611

> RoleHistory to support reloads with different # of roles from current set
> -------------------------------------------------------------------------
>
>                 Key: SLIDER-600
>                 URL: https://issues.apache.org/jira/browse/SLIDER-600
>             Project: Slider
>          Issue Type: Sub-task
>          Components: appmaster
>    Affects Versions: Slider 0.60
>            Reporter: Steve Loughran
>             Fix For: Slider 2.0.0
>
>
> The role history won't reload historical placement data if the no. of roles doesn't match what it saved. It only persists numeric values and can't rebuild the information. 
> This means if you add a new role to a cluster: no recovery of any previous placement
> It could persist the names -> priorities of each role, and reload the positions of those roles about which there are currently records, ignoring the rest.



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