Failed to add storage directory [DISK]file:/dfs/dn
    java.io.IOException: Incompatible clusterIDs in /dfs/dn: namenode clusterID = cluster79; datanode clusterID = cluster90
    **
    修改 /dfs/dn/current 和 /opt/dfs/dn/current 中的VERSION

    1. cd /dfs/dn/current
    2. cd /opt/dfs/dn/current
    4. nano VERSION
    1. #Tue Dec 24 17:38:50 CST 2019
    2. storageID=DS-c63fbdfa-f1e5-48d7-b0e8-05752296ceae
    3. clusterID=cluster90
    4. cTime=0
    5. datanodeUuid=4cf7e649-27ae-48fd-a038-97e41de0d5bc
    6. storageType=DATA_NODE
    7. layoutVersion=-57

    修改 clusterID

    1. #Tue Dec 24 17:38:50 CST 2019
    2. storageID=DS-c63fbdfa-f1e5-48d7-b0e8-05752296ceae
    3. clusterID=cluster90
    4. cTime=0
    5. datanodeUuid=4cf7e649-27ae-48fd-a038-97e41de0d5bc
    6. storageType=DATA_NODE
    7. layoutVersion=-57

    修改后启动 datanode