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https://issues.apache.org/jira/browse/HDDS-1982?focusedWorklogId=310884&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-310884
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ASF GitHub Bot logged work on HDDS-1982:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 11/Sep/19 17:38
            Start Date: 11/Sep/19 17:38
    Worklog Time Spent: 10m 
      Work Description: sodonnel commented on pull request #1344: HDDS-1982 
Extend SCMNodeManager to support decommission and maintenance states
URL: https://github.com/apache/hadoop/pull/1344#discussion_r323370846
 
 

 ##########
 File path: 
hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/node/SCMNodeManager.java
 ##########
 @@ -417,9 +451,12 @@ private SCMNodeStat getNodeStatInternal(DatanodeDetails 
datanodeDetails) {
 
   @Override
   public Map<String, Integer> getNodeCount() {
+    // TODO - This does not consider decom, maint etc.
     Map<String, Integer> nodeCountMap = new HashMap<String, Integer>();
 
 Review comment:
   The existing code had Map<String, Integer>, but I agree it would be better 
with <NodeState, Integer> or <NodeStatus, Integer>. I plan to leave this as is 
for now, as this method is used only for JMX right now, and I plan to split 
that out into a separate change via HDDS-2113 as there are some open questions 
there.
 
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Issue Time Tracking
-------------------

    Worklog Id:     (was: 310884)
    Time Spent: 5h 40m  (was: 5.5h)

> 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
>          Time Spent: 5h 40m
>  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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