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https://issues.apache.org/jira/browse/MAPREDUCE-3360?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13170674#comment-13170674
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Jason Lowe commented on MAPREDUCE-3360:
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This looks like a duplicate of MAPREDUCE-3271.
A few comments on the patch:
1. Should the "Total Nodes" column header on the nodes pages be changed to
something like "Active Nodes"? Currently it sounds like it should be a count
of all the nodes (active or not) associated with the cluster, but it's only
counting the active nodes. Related to this, should there be a page listing all
nodes regardless of state (i.e.: a real Total Nodes page)?
2. There will be bookkeeping issues for the inactive nodes when a single host
has been configured with multiple nodemanager instances. (A bit odd, but
possible to setup.) Since the inactive nodes are tracked only by hostname, we
will remove a node from the inactive list when a new nodemanager appears on a
different port. Probably best to track that issue in a separate JIRA. There
are other issues with that setup, e.g.: inability to detect redundant
nodemanager launches, limit nodemanager instances, etc.
3. Maintenance: ClusterMetrics.decr(RMNodeState) doesn't handle all the node
states. May be better to just to remove this method and have the one place
it's used do the switch.
3. Nit: The "N/A" web address for inactive nodes shouldn't be a hyperlink,
since it doesn't go anywhere useful.
> Provide information about lost nodes in the UI.
> -----------------------------------------------
>
> Key: MAPREDUCE-3360
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-3360
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: mrv2
> Affects Versions: 0.23.0
> Environment: NA
> Reporter: Bh V S Kamesh
> Attachments: MAPREDUCE-3360.patch, lostNodes.png
>
>
> Currently there is no information provided about *lost nodes*. Provide
> information in the UI.
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