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From "ASF GitHub Bot (Jira)" <j...@apache.org>
Subject [jira] [Updated] (HDDS-1982) Extend SCMNodeManager to support decommission and maintenance states
Date Fri, 23 Aug 2019 16:19:00 GMT

     [ https://issues.apache.org/jira/browse/HDDS-1982?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

ASF GitHub Bot updated HDDS-1982:
---------------------------------
    Labels: pull-request-available  (was: )

> Extend SCMNodeManager to support decommission and maintenance states
> --------------------------------------------------------------------
>
>                 Key: HDDS-1982
>                 URL: https://issues.apache.org/jira/browse/HDDS-1982
>             Project: Hadoop Distributed Data Store
>          Issue Type: Sub-task
>          Components: SCM
>            Reporter: Stephen O'Donnell
>            Assignee: Stephen O'Donnell
>            Priority: Major
>              Labels: pull-request-available
>
> Currently, within SCM a node can have the following states:
> HEALTHY
> STALE
> DEAD
> DECOMMISSIONING
> DECOMMISSIONED
> The last 2 are not currently used.
> In order to support decommissioning and maintenance mode, we need to extend the set of
states a node can have to include decommission and maintenance states.
> It is also important to note that a node decommissioning or entering maintenance can
also be HEALTHY, STALE or go DEAD.
> Therefore in this Jira I propose we should model a node state with two different sets
of values. The first, is effectively the liveliness of the node, with the following states.
This is largely what is in place now:
> HEALTHY
> STALE
> DEAD
> The second is the node operational state:
> IN_SERVICE
> DECOMMISSIONING
> DECOMMISSIONED
> ENTERING_MAINTENANCE
> IN_MAINTENANCE
> That means the overall total number of states for a node is the cross-product of the
two above lists, however it probably makes sense to keep the two states seperate internally.



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