An elephant keeper told me he was concerned about his NameNode server because some users may abuse it. To keep NameNode from suffering from too many, too hasty clients, actually we can check the following action list. If you have done all of this, your NameNode should be more reliable. Or if it’s not, you should have more related context for root cause analysis. This is also to address common potential performance problems. However, if you cluster is small or idle, no bother.