Uploaded image for project: 'Hadoop YARN'
  1. Hadoop YARN
  2. YARN-45 [Preemption] Scheduler feedback to AM to release containers
  3. YARN-567

RM changes to support preemption for FairScheduler and CapacityScheduler

VotersWatch issueWatchersLinkCloneUpdate Comment AuthorReplace String in CommentUpdate Comment VisibilityDelete Comments
    XMLWordPrintableJSON

Details

    • Sub-task
    • Status: Closed
    • Major
    • Resolution: Fixed
    • None
    • 2.1.0-beta
    • resourcemanager
    • None

    Description

      A common tradeoff in scheduling jobs is between keeping the cluster busy and enforcing capacity/fairness properties. FairScheduler and CapacityScheduler takes opposite stance on how to achieve this.

      The FairScheduler, leverages task-killing to quickly reclaim resources from currently running jobs and redistributing them among new jobs, thus keeping the cluster busy but waste useful work. The CapacityScheduler is typically tuned
      to limit the portion of the cluster used by each queue so that the likelihood of violating capacity is low, thus never wasting work, but risking to keep the cluster underutilized or have jobs waiting to obtain their rightful capacity.

      By introducing the notion of a work-preserving preemption we can remove this tradeoff. This requires a protocol for preemption (YARN-45), and ApplicationMasters that can answer to preemption efficiently (e.g., by saving their intermediate state, this will be posted for MapReduce in a separate JIRA soon), together with a scheduler that can issues preemption requests (discussed in separate JIRAs YARN-568 and YARN-569).

      The changes we track with this JIRA are common to FairScheduler and CapacityScheduler, and are mostly propagation of preemption decisions through the ApplicationMastersService.

      Attachments

        1. YARN-567.patch
          4 kB
          Carlo Curino
        2. YARN-567.patch
          4 kB
          Carlo Curino

        Issue Links

        Activity

          This comment will be Viewable by All Users Viewable by All Users
          Cancel

          People

            curino Carlo Curino
            curino Carlo Curino
            Votes:
            0 Vote for this issue
            Watchers:
            13 Start watching this issue

            Dates

              Created:
              Updated:
              Resolved:

              Slack

                Issue deployment