The Resource Manager's Cluster Applications and Cluster Application REST APIs are sometimes returning invalid JSON. This was addressed in
However, the fix only fixes the calculation in one site and does not guarantee to avoid the problem.Likewise, generating NaN/Inf can break the web GUI if the columns cannot render non-numeric values.
The suggested fix is to check for NaN/Inf in the protob. The protob replaces NaN/Inf by 0.0f.