[YARN-4256] YARN fair scheduler vcores with decimal values

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.7.1
• Fix Version/s: 2.8.0, 3.0.0-alpha1
• Component/s: fairscheduler
• Target Version/s: 2.8.0
• Hadoop Flags: Reviewed
• Assignee: Jun Gong
• Reporter: Prabhu Joseph
• Created: 12/Oct/15 16:06
• Updated: 23/Oct/19 16:15
• Resolved: 22/Oct/15 19:38

Description

When the queue with vcores is in decimal value, the value after the decimal point is taken as vcores by FairScheduler.

For the below queue,

<minResources>20000 mb,20 vcores,20.25 disks</minResources>
<maxResources>30000 mb,40.2 vcores,30.25 disks</maxResources>

When many applications submitted parallely into queue, all were in PENDING state as the vcores is taken as 2 skipping the value 40.

The code FairSchedulerConfiguration.java to Pattern match the vcores has to be improved in such a way either throw AllocationConfigurationException("Missing resource") or consider the value before decimal.