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https://issues.apache.org/jira/browse/MAPREDUCE-3730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13215937#comment-13215937
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Vinod Kumar Vavilapalli commented on MAPREDUCE-3730:
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Thanks Jason, this looks far better. +1.
I found some race conditions in the same code area, will file separate ticket
and file them.
I am going to push this in.
> Allow restarted NM to rejoin cluster before RM expires it
> ---------------------------------------------------------
>
> Key: MAPREDUCE-3730
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-3730
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: mrv2, resourcemanager
> Affects Versions: 0.23.1, 0.24.0
> Reporter: Jason Lowe
> Assignee: Jason Lowe
> Priority: Minor
> Fix For: 0.23.2
>
> Attachments: MAPREDUCE-3730.patch, MAPREDUCE-3730.patch,
> MAPREDUCE-3730.patch
>
>
> When a node in the RUNNING state (healthy or unhealthy) is rebooted, the
> resourcemanager rejects the nodemanager's registration request as a duplicate
> because it is convinced that the nodemanager is already running on that node.
> It won't allow that node to rejoin the cluster until the node expiration
> time elapses which is 10min+ by default. We should allow the NM to rejoin
> the cluster if it re-registers within the expiration timeout.
> Note that this problem occurs with NMs that are configured to specific ports.
> If ephemeral ports are used then a NM reboot "works" because the RM thinks
> the NM registration is for a new node. See the discussions in MAPREDUCE-3070
> and MAPREDUCE-3363.
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