There are different when they are read/write from multiple clients in same time. HopsFS can use the meta service to synchronize with each other under low latency (about ms), but ObjectiveFS have to use S3 to do the synchronisation, which has much higher latency (> 20ms).

We have chatted on these with the founders of ObjectiveFS before creating JuiceFS, they did NOT recommend to use ObjectiveFS in big data workload with Hadoop/Spark, that's why we started to build JuiceFS since 2016.