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From "Hemanth Yamijala (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-3376) [HOD] HOD should have a way to detect and deal with clusters that violate/exceed resource manager limits
Date Tue, 03 Jun 2008 10:40:45 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-3376?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Hemanth Yamijala updated HADOOP-3376:
-------------------------------------

    Release Note: HOD client was modified to look for specific messages related to resource
limit overruns and take appropriate actions - such as either failing to allocate the cluster,
or issuing a warning to the user. A tool is provided, specific to Maui and Torque, that will
set these specific messages.
    Hadoop Flags: [Reviewed]

> [HOD] HOD should have a way to detect and deal with clusters that violate/exceed resource
manager limits
> --------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-3376
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3376
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: contrib/hod
>            Reporter: Vinod Kumar Vavilapalli
>            Assignee: Vinod Kumar Vavilapalli
>             Fix For: 0.18.0
>
>         Attachments: checklimits.sh, HADOOP-3376, HADOOP-3376.1, HADOOP-3376.2
>
>
> Currently If we set up resource manager/scheduler limits on the jobs submitted, any HOD
cluster that exceeds/violates these limits may 1) get blocked/queued indefinitely or 2) blocked
till resources occupied by old clusters get freed. HOD should detect these scenarios and deal
intelligently, instead of just waiting for a long time/ for ever. This means more and proper
information to the submitter.
> (Internal) Use Case:
>      If there are no resource limits, users can flood the resource manager queue preventing
other users from using the queue. To avoid this, we could have various types of limits setup
in either resource manager or a scheduler - max node limit in torque(per job limit), maxproc
limit in maui (per user/class), maxjob limit in maui(per user/class) etc. But there is one
problem with the current setup - for e.g if we set up maxproc limit in maui to limit the aggregate
number of nodes by any user over all jobs, 1) jobs get queued indefinitely if jobs exceed
max limit and 2) blocked if it asks for nodes < max limit, but some of the resources are
already used by jobs from the same user. This issue addresses how to deal with scenarios like
these.

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