首先,查看namenode日志
发现大量的相同报错信息
ERROR org.apache.hadoop.hdfs.StateChange: BLOCK* NameSystem.getDatanode:
Data node DatanodeRegistration(192.168.216.102:9866, datanodeUuid=d789da46-1139-4fbe-94a6-a4efdb7ae1dc,
infoPort=9864, infoSecurePort=0, ipcPort=9867, storageInfo=