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https://issues.apache.org/jira/browse/YARN-2001?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13990215#comment-13990215
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Ming Ma commented on YARN-2001:
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1. In the HA set up, could we make standby RM hot by having NMs send heartbeat
to all RMs? NMs will ignore the heartbeat response's commands from standby
RMs. In that way, the new active will have most recent NMs state right after
the failover.
2. Decommission handling. If decommission state can be reconstructed via
include and exclude files, maybe we can ask admins to update include and
exclude files on all RM nodes during decommission process.
> Persist NMs info for RM restart
> -------------------------------
>
> Key: YARN-2001
> URL: https://issues.apache.org/jira/browse/YARN-2001
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: resourcemanager
> Reporter: Jian He
> Assignee: Jian He
>
> RM should not accept allocate requests from AMs until all the NMs have
> registered with RM. For that, RM needs to remember the previous NMs and wait
> for all the NMs to register.
> This is also useful for remembering decommissioned nodes across restarts.
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