Naganarasimha G R created YARN-3945:
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Summary: maxApplicationsPerUser is wrongly calculated
Key: YARN-3945
URL: https://issues.apache.org/jira/browse/YARN-3945
Project: Hadoop YARN
Issue Type: Bug
Components: capacityscheduler
Affects Versions: 2.7.1
Reporter: Naganarasimha G R
Assignee: Naganarasimha G R
maxApplicationsPerUser is currently calculated based on the formula
{{maxApplicationsPerUser = (int)(maxApplications * (userLimit / 100.0f) *
userLimitFactor)}} but description of userlimit is
{quote}
Each queue enforces a limit on the percentage of resources allocated to a user
at any given time, if there is demand for resources. The user limit can vary
between a minimum and maximum value.{color:red} The the former (the minimum
value) is set to this property value {color} and the latter (the maximum value)
depends on the number of users who have submitted applications. For e.g.,
suppose the value of this property is 25. If two users have submitted
applications to a queue, no single user can use more than 50% of the queue
resources. If a third user submits an application, no single user can use more
than 33% of the queue resources. With 4 or more users, no user can use more
than 25% of the queues resources. A value of 100 implies no user limits are
imposed. The default is 100. Value is specified as a integer.
{quote}
configuration related to minimum limit should not be made used in a formula to
calculate max applications for a user
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