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From "Vinod Kumar Vavilapalli (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 Mon, 19 May 2008 13:46:55 GMT

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

Vinod Kumar Vavilapalli updated HADOOP-3376:
--------------------------------------------

    Attachment: HADOOP-3376.1

Made the suggested changes. Also updated documentation.
  - When asking for resources>max limits, it prints "Request exceeded maximum user limits.
CurentUsage:%s, Requested:%s, MaxLimit:%s" at critical log level and deletes the cluster.
  - When request is within limits but cumulative usage crosses limits, it prints "Request
exceeded maximum user limits. CurentUsage:%s, Requested:%s, MaxLimit:%s.  This cluster will
remain queued till old clusters free resources" at info level and stays in the queued state.
  - Replaced job-feasibity config parameter with job-feasibility-attr : specifies whether
to check job feasibility - resource manager and/or scheduler limits, also gives the attribute
value. It defaults to TORQUE_USER_LIMITS_COMMENT_FIELD which is "User-limits exceeded. Requested:([0-9]*)
Used:([0-9]*) MaxLimit:([0-9]*). 
  - Made necessary changes in checklimits and putting it now in hod/support dir.

> [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
>         Attachments: checklimits.sh, HADOOP-3376, HADOOP-3376.1
>
>
> 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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