@GangWar  I don't think this is a problem with host resolution. "glbgnameservice" is the value of our hdfs namespace,on this host I can access HDFS through shell command.I did not make any changes. After restarting the nodemanager process, the log of the nodemanager process is normal.The node with the problem becomes normal after restarting the nodemanager process. After a few days, other nodes that have not restarted may have the same problem. Finally, I restarted the entire yarn, and now it is under observation. ... View more