1. The rights issue
Care must be taken after permissions for each directory cloudera manager of operational problems
After manually Hdfs format, manually start Hdfs will automatically generate the following three documents: the need to modify the permissions of each directory:
NameNode data directory: / DFS / NN
the HDFS checkpoint directory: / DFS / SNN
DataNodes data directory: / data / dfs / dn
2.Canary test can not create a parent directory for /tmp/.cloudera_health_monitoring_canary_files. (Canary other issues, most of the wait for a while just fine)
Hdfs need to modify the root directory permissions: hdfs dfs -chmod 777 /
3. Modify the storage directory
When added directly to the need for disk space DataNode add, modify the directory if storage shear mv, then modified to correspond to the above address in cm
4.HDFS NFS Gateway can not start to mount failures:
Keywords kind, no portmap or rpcbind service, so follow-up work can be done: No portmap or rpcbind Service
Working operation mechanism: HDFS NFS Gateway work to hang rpcbind service, so need to determine before the start of rpcbind service open normally. service rpcbind start
But HDFS NFS service is the system comes with the conflict NFS service, so need to be closed before starting the system comes NFS service. service nfs stop