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https://issues.apache.org/jira/browse/HDDS-1982?focusedWorklogId=310882&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-310882
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ASF GitHub Bot logged work on HDDS-1982:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 11/Sep/19 17:36
            Start Date: 11/Sep/19 17:36
    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_r323369810
 
 

 ##########
 File path: 
hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/node/states/NodeStateMap.java
 ##########
 @@ -309,4 +381,61 @@ private void checkIfNodeExist(UUID uuid) throws 
NodeNotFoundException {
       throw new NodeNotFoundException("Node UUID: " + uuid);
     }
   }
+
+  /**
+   * Create a list of datanodeInfo for all nodes matching the passed states.
+   * Passing null for one of the states acts like a wildcard for that state.
+   *
+   * @param opState
+   * @param health
+   * @return List of DatanodeInfo objects matching the passed state
+   */
+  private List<DatanodeInfo> filterNodes(
+      NodeOperationalState opState, NodeState health) {
+    if (opState != null && health != null) {
 
 Review comment:
   I had not really looked into the Streams API before, but I change the code 
to use streams and it does make it easier to follow, so I have made this 
change. I still kept the IF statements at the start of the method as if both 
params are null we can just return the entire list with no searching and if 
both are non-null we can search using the NodeStatus which should be slightly 
more efficient.
 
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Issue Time Tracking
-------------------

    Worklog Id:     (was: 310882)
    Time Spent: 5.5h  (was: 5h 20m)

> 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: 5.5h
>  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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