[jira] [Created] (YARN-6021) When your allocated minShare of all queue`s added up exceed cluster capacity you can get some queue for 0 fairshare

["Feng Yuan (JIRA)" <ji...@apache.org>]

Feng Yuan created YARN-6021:
-------------------------------

             Summary: When your allocated minShare of all queue`s added up exceed cluster capacity you can get some queue for 0 fairshare
                 Key: YARN-6021
                 URL: https://issues.apache.org/jira/browse/YARN-6021
             Project: Hadoop YARN
          Issue Type: Bug
          Components: fairscheduler
    Affects Versions: 2.4.0
            Reporter: Feng Yuan
            Priority: Critical


In fair-scheduler.xml,If you config the minshare add up exceed parentQueue`s fairshare,for root`s childs,fairshare is cluster capacity.
You will found your R value look like below when compute childs fairshares:
1.0 
0.5 
0.25 
0.125 
0.0625 
0.03125 
0.015625 
0.0078125 
0.00390625
I find this is due to:
double rMax = 1.0;
    while (resourceUsedWithWeightToResourceRatio(rMax, schedulables, type)
        < totalResource) {
      rMax *= 2.0;
  }

because resourceUsedWithWeightToResourceRatio will add minShare together.
As i think is really should we bring in minShare when compute fairshare?
My advice is we just consider weight is enough,and minshare's guarantee
will get fulfill when assginContainer!
Hope suggestion!




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