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  1. Hadoop Map/Reduce
  2. MAPREDUCE-3653

Improvements to CapacityScheduler doc



    • Improvement
    • Status: Resolved
    • Major
    • Resolution: Invalid
    • 0.23.0
    • 0.23.1
    • mrv2
    • None
    • Reviewed
    • document changes only.


      I noticed the following issues with the capacity scheduler doc: ./hadoop-mapreduce-project/hadoop-yarn/hadoop-yarn-site/src/site/apt/CapacityScheduler.apt.vm

      • In overview section, 3rd paragraph, sentence "There is an added benefit that an organization can access any excess capacity no being used by others". No should be not.
      • in overview section, 4th paragraph. dispropotionate misspelled
      • in features section, under multitenancy - monopolizing is misspelled.
      • in features section, under operability - it doesn't say if you can delete queues at runtime? I see there is a note at the end but perhaps that can be added into the other sections to since its easy to miss that Note at the very end.
      • in features section - hierarchy and Hierarchical mispelled.
      • under configuration section the class to turn on to use capacity scheduler should be: org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler
      • section on setting up queues, 4th sentence - hierarchy misspelled as heirarcy and heirarchy.
      • I think specifying how a user has to specify the queue when running a job/app would be useful information. Especially with the new hierarchical queues. Does the user have to specify the entire path like a.b.c or can they just specify c.
      • under "Running and Pending Application Limits" section, property "yarn.scheduler.capacity.maximum-applications", they are referred to them as jobs, I believe that should be applications.
      • misspelled concurrently as concurently in same section of maximum-applications.
      • I think it should specify the defaults (if any) for the config vars. Also what format are they specified in - int, float,etc?
      • might be nice to say it doesn't support preemption.
      • under admin options yarn.scheduler.capacity.<queue-path>.state - queues misspelled as queueus
      • under changing queue configuration it should have "yarn" in front of the "rmadmin -refreshQueues". Similarly a few lines down at "$YARN_HOME/bin/rmadmin -refreshQueues"


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              tgraves Thomas Graves
              yarnon Yoram Arnon
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