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https://issues.apache.org/jira/browse/HDDS-1982?focusedWorklogId=306750&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-306750
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ASF GitHub Bot logged work on HDDS-1982:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 04/Sep/19 22:24
            Start Date: 04/Sep/19 22:24
    Worklog Time Spent: 10m 
      Work Description: anuengineer commented on pull request #1344: HDDS-1982 
Extend SCMNodeManager to support decommission and maintenance states
URL: https://github.com/apache/hadoop/pull/1344#discussion_r320996724
 
 

 ##########
 File path: 
hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/node/NodeStateManager.java
 ##########
 @@ -426,18 +432,20 @@ public int getStaleNodeCount() {
    * @return dead node count
    */
   public int getDeadNodeCount() {
-    return getNodeCount(NodeState.DEAD);
+    // TODO - hard coded IN_SERVICE
+    return getNodeCount(
+        new NodeStatus(NodeOperationalState.IN_SERVICE, NodeState.DEAD));
 
 Review comment:
   Interesting; what happens to a node in maintenance mode, but switched off? 
or dead? Does that become a dead node? I think I agree with your conclusion 
that it is not a dead node, but flagging for others to consider.
 
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Issue Time Tracking
-------------------

    Worklog Id:     (was: 306750)

> 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: 1h
>  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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