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From Jordà Polo (JIRA) <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-1380) Adaptive Scheduler
Date Thu, 04 Feb 2010 08:50:28 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-1380?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Jordà Polo updated MAPREDUCE-1380:

    Attachment: MAPREDUCE-1380_0.1.patch

I'm attaching a patch with an initial version of the scheduler.

As I said, this is still a work in progress and I'll be posting new versions as they are ready.
There is still some work left to make it useful for everyone and not just for our own needs,
but I wanted to contribute it now since it may be of interest to other people.

(I'll also be posting a PDF with additional documentation later today.)

> Adaptive Scheduler
> ------------------
>                 Key: MAPREDUCE-1380
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1380
>             Project: Hadoop Map/Reduce
>          Issue Type: New Feature
>            Reporter: Jordà Polo
>            Priority: Minor
>         Attachments: MAPREDUCE-1380_0.1.patch
> The Adaptive Scheduler is a pluggable Hadoop scheduler that automatically adjusts the
amount of used resources depending on the performance of jobs and on user-defined high-level
business goals.
> Existing Hadoop schedulers are focused on managing large, static clusters in which nodes
are added or removed manually. On the other hand, the goal of this scheduler is to improve
the integration of Hadoop and the applications that run on top of it with environments that
allow a more dynamic provisioning of resources.
> The current implementation is quite straightforward. Users specify a deadline at job
submission time, and the scheduler adjusts the resources to meet that deadline (at the moment,
the scheduler can be configured to either minimize or maximize the amount of resources). If
multiple jobs are run simultaneously, the scheduler prioritizes them by deadline. Note that
the current approach to estimate the completion time of jobs is quite simplistic: it is based
on the time it takes to finish each task, so it works well with regular jobs, but there is
still room for improvement for unpredictable jobs.
> The idea is to further integrate it with cloud-like and virtual environments (such as
Amazon EC2, Emotive, etc.) so that if, for instance, a job isn't able to meet its deadline,
the scheduler automatically requests more resources.

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