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https://issues.apache.org/jira/browse/YARN-1101?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13752843#comment-13752843
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Thomas Graves commented on YARN-1101:
-------------------------------------
thanks Rob. +1 Patch looks good. We should file a separate jira to add in
tests for the metrics the healthy state transitions.
> Active nodes can be decremented below 0
> ---------------------------------------
>
> Key: YARN-1101
> URL: https://issues.apache.org/jira/browse/YARN-1101
> Project: Hadoop YARN
> Issue Type: Bug
> Components: resourcemanager
> Affects Versions: 3.0.0, 0.23.9, 2.0.6-alpha
> Reporter: Robert Parker
> Assignee: Robert Parker
> Attachments: YARN-1101_b0.23_v1.patch, YARN-1101_v1.patch
>
>
> The issue is in RMNodeImpl where both RUNNING and UNHEALTHY states that
> transition to a deactive state (LOST, DECOMMISSIONED, REBOOTED) use the same
> DeactivateNodeTransition class. The DeactivateNodeTransition class naturally
> decrements the active node, however the in cases where the node has
> transition to UNHEALTHY the active count has already been decremented.
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