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From "Vinod Kumar Vavilapalli (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-3730) Allow restarted NM to rejoin cluster before RM expires it
Date Fri, 24 Feb 2012 21:43:49 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-3730?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vinod Kumar Vavilapalli updated MAPREDUCE-3730:
-----------------------------------------------

          Resolution: Fixed
    Target Version/s: 0.23.2  (was: 0.23.2, 0.24.0)
        Release Note: Modified RM to allow restarted NMs to be able to join the cluster without
waiting for expiry.
        Hadoop Flags: Reviewed
              Status: Resolved  (was: Patch Available)

Just committed this to trunk and branch-0.23. Thanks Jason!
                
> 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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