I have no detailed knowledge of the JanusGraph backend code myself, but just a reaction for clarification (so that others see more hints to the cause of the issue):
- Is it possible that the value of the cID property is very large (e.g. because it is an array/multiproperty)?
- Does the query also fail with limit(1), limit(10), etc.?
- Does the query also fail with the .values("cID") replaced by .id()?
- Did you do anything special with partitioning of the graph (preferably attach the graph properties file)?
Best wishes, Marc