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From "Brian Cho (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3460) MR AM can hang if containers are allocated on a node blacklisted by the AM
Date Tue, 01 May 2012 07:15:46 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3460?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13265692#comment-13265692
] 

Brian Cho commented on MAPREDUCE-3460:
--------------------------------------

Was a JIRA ever filed for using hostname:port instead of only hostname in FifoScheduler?
                
> MR AM can hang if containers are allocated on a node blacklisted by the AM
> --------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-3460
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3460
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mr-am, mrv2
>    Affects Versions: 0.23.0, 0.24.0
>            Reporter: Siddharth Seth
>            Assignee: Robert Joseph Evans
>            Priority: Blocker
>             Fix For: 0.23.1
>
>         Attachments: MR-3460.txt, MR-3460.txt, MR3460_v3.txt, MR3460_v4.txt
>
>
> When an AM is assigned a FAILED_MAP (priority = 5) container on a nodemanager which it
has blacklisted - it tries to
> find a corresponding container request.
> This uses the hostname to find the matching container request - and can end up returning
any of the ContainerRequests which may have requested a container on this node. This container
request is cleaned to remove the bad node - and then added back to the RM 'ask' list.
> The AM cleans the 'ask' list after each heartbeat - The RM Allocator is still aware of
the priority=5 container (in 'remoteRequestsTable') - but this never gets added back to the
'ask' set - which is what is sent to the RM.

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