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https://issues.apache.org/jira/browse/HDFS-9391?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15802316#comment-15802316
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Manoj Govindassamy commented on HDFS-9391:
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Case 1: One replica is decommissioning and two replicas of the same block are
entering maintenance
{quote} the code will still increment maintenanceOnlyReplicas when processing
the decommissioning node, because NumberReplicas includes all replicas stats.
{quote}
* I don't think so. In the current upstream trunk code, a node can only be in
one state and {{NumberReplicas}} accounting for _Decommission_ and
_Maintenance_ are exclusive. If the replica is Decommissioning, it cannot be in
any of Maintenance states, and vice versa.
* In the current upstream trunk code, {{outOfServiceReplicas}} is defined as a
sum of both decommission and maintenance
* Patch v02 in this jira, just makes use of already accounted numbers in
{{NumberReplicas}} in different variables namely -- decommissionOnlyReplicas
and maintenanceOnlyReplicas
So in the above example, with the patch v02 we will get following numbers
-- decommissionOnlyReplicas = 1
-- maintenanceOnlyReplicas = 2
-- outOfServiceReplicas = 3
Hence,
-- Entering Maintenance page will only show 2 maintenance replica nodes
-- Decommissioning page will only show 1 decommissioning replica node
Case 2: All replicas are decommissioning
{quote}EnteringMaintenance page will have nothing to show to begin with given
no nodes are entering maintenance.{quote}
* Thats right. When all replicas are decommissioning, {{NumberReplicas}} will
only have decommissionedAndDecommissioning nodes.
* Entering Maintenance page will be empty
* Decommissioning page will show all these decommissioning nodes
[~mingma],
* Do the above cases and results match your expectation ?
* Also, lets make sure we are targeting the same goals w.r.t Decommissioing and
EnteringMaintenance Page. Based on the discussions we had earlier (refer
comments 1 - 4), I assumed we want the following
** Entering Maintenance Page to show the nodes that are Entering Maintenance /
In Maintenance Only.
** Decommissioning Page to show the nodes that are Decommissioning /
Decommissioned Only.
* Please correct me if my understanding from the current upstream trunk code is
wrong or if we want different goals for the pages.
> Update webUI/JMX to display maintenance state info
> --------------------------------------------------
>
> Key: HDFS-9391
> URL: https://issues.apache.org/jira/browse/HDFS-9391
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Affects Versions: 3.0.0-alpha1
> Reporter: Ming Ma
> Assignee: Manoj Govindassamy
> Attachments: HDFS-9391-MaintenanceMode-WebUI.pdf, HDFS-9391.01.patch,
> HDFS-9391.02.patch, Maintenance webUI.png
>
>
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