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Posted to hdfs-dev@hadoop.apache.org by "Anu Engineer (Jira)" <ji...@apache.org> on 2019/09/20 18:54:00 UTC
[jira] [Resolved] (HDDS-1982) Extend SCMNodeManager to support
decommission and maintenance states
[ https://issues.apache.org/jira/browse/HDDS-1982?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Anu Engineer resolved HDDS-1982.
--------------------------------
Fix Version/s: 0.5.0
Resolution: Fixed
[~sodonnell] Thank you for the contribution. I have committed this patch to the HDDS-1880-Decom branch.
> 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
> Fix For: 0.5.0
>
> Time Spent: 7h
> Remaining Estimate: 0h
>
> 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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