[YARN-7461] DominantResourceCalculator#ratio calculation problem when right resource contains zero value

• Type: Bug
• Status: Patch Available
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 3.0.0-alpha4
• Target Version/s: 3.5.0
• Assignee: Tao Yang
• Reporter: Tao Yang
• Created: 08/Nov/17 09:50
• Updated: 04/Jan/24 08:45

Description

Currently DominantResourceCalculator#ratio may return wrong result when right resource contains zero value. For example, there are three resource types such as <memory-mb, vcores, vssd>, leftResource=<5, 5, 0> and rightResource=<10, 10, 0>, we expect the result of DominantResourceCalculator#ratio(leftResource, rightResource) is 0.5 but currently is NaN.
There should be a verification before divide calculation to ensure that dividend is not zero.