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https://issues.apache.org/jira/browse/HDDS-1982?focusedWorklogId=312504&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-312504
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ASF GitHub Bot logged work on HDDS-1982:
----------------------------------------
Author: ASF GitHub Bot
Created on: 14/Sep/19 05:09
Start Date: 14/Sep/19 05:09
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_r324412721
##########
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:
please be aware that stream.filter kind of patterns have a huge overhead
over normal for. If this code is going to be in any sort of critical path, it
is better for the code to stay normal for.
Please see some fixes made by todd lipcon, in HDFS because of this issue.
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Issue Time Tracking
-------------------
Worklog Id: (was: 312504)
Time Spent: 6h (was: 5h 50m)
> 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: 6h
> 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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