Just setting that up will cost at least 2-4gb of ram, and we are streched thin as it is, 2gb of ram would mean we have to get one more node for our kubernetes cluster in gcloud.
Me and my team understands the 300 lines of code that go into rochefort and can twist and modify it for our needs.
Performance will make or break our startup, which deals with real time user behaviour analytics, and doing high performant java for a while, I know very well how much time I will have to spend looking at G1 logs to fine tune it.
I am sure we wont use rochefort after we scale up, but for now I think gives us greather velocity than kafka (just because if we want to modify kafka we have to spend a week on a simple change).
I want to be able to add more meta information in the header, or read the files from another process, rsync and read them to my laptop, add custom reducers etc, all those things will take me minutes with rochefort and days with kafka.