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https://issues.apache.org/jira/browse/HDFS-9391?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ming Ma updated HDFS-9391:
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Attachment: Maintenance webUI.png
Thanks [~manojg]!
bq. Shouldn't the DecomNodes include only replicas for DECOMMISSION_INPROGRESS
nodes?
Good point. The question what value "decommissionOnlyReplicas" property should
be in the context of maintenance mode. A specific example is if a block has 3
replicas with one node entering maintenance and the other two being
decommissioned, if it should be included in "decommissionOnlyReplicas". Given
we normally use the property as a risk indicator, e.g. what if all
decommissioning or entering maintenance nodes fail, it seems ok to include
both. Sure there is backward compatibility semantics here; you can argue it is
ok given the behavior is the same without maintenance. If we really want to
separately account for all-3-replicas-being-decommissioned, we can keep the
strict semantics and add a new property "outOfServiceOnlyReplicas" to account
for both types. To enable that, we will need to track each type separately in
LeavingServiceStatus.
bq. should we also have FSNameSystem#getMaintenanceNodes?
Yes something like NameNodeMXBean#getEnteringMaintenanceNodes will be useful.
bq. w.r.t showing Maintenance nodes details ?
getDeadNodes only returns decommissioned case. You can add ".put("adminState",
node.getAdminState().toString())" to the JSON to cover maintenance. You can
also add counters to FSNamesystemMBean such as getNumMaintenanceLiveDataNodes,
similar to getNumDecomLiveDataNodes and getNumDecomDeadDataNodes.
bq. "In Maintenance" Live/Dead nodes count also need to be shown along with
Decommission nodes ?
That is right. The attached screenshot could be useful. After someone clicks
the "Entering Maintenance Nodes", it should redirect to another page about its
progress, similar to the "Decommissioning Nodes".
bq. Is there a plan to expose the concept of 'OutOfService'?
Based on how we use them, decommissioned nodes are tracked separately from
maintenance nodes, other than the first point you brought up.
> Update webUI/JMX/fsck to display maintenance state info
> -------------------------------------------------------
>
> Key: HDFS-9391
> URL: https://issues.apache.org/jira/browse/HDFS-9391
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Ming Ma
> Assignee: Manoj Govindassamy
> Attachments: Maintenance webUI.png
>
>
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