CDC(Change Data Capture) is made up of two components, the CDD and the CDT. CDD is stand for Change Data Detection and CDT is stand for Change Data Transfer.
hadoop2: Warning: Permanently added 'hadoop2,172.21.0.22' (ECDSA) to the list of known hosts.
hadoop4: Warning: Permanently added 'hadoop4,172.21.0.24' (ECDSA) to the list of known hosts.
hadoop3: Warning: Permanently added 'hadoop3,172.21.0.23' (ECDSA) to the list of known hosts.
hadoop2: @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
hadoop2: @ WARNING: UNPROTECTED PRIVATE KEY FILE! @
hadoop2: @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
hadoop2: Permissions 0644 for '/home/hduser/.ssh/id_rsa' are too open.
hadoop2: It is required that your private key files are NOT accessible by others.
hadoop2: This private key will be ignored.
hadoop2: Load key "/home/hduser/.ssh/id_rsa": bad permissions
hadoop2: hduser@hadoop2: Permission denied (publickey,password).
hadoop4: @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
hadoop4: @ WARNING: UNPROTECTED PRIVATE KEY FILE! @
hadoop4: @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
hadoop4: Permissions 0644 for '/home/hduser/.ssh/id_rsa' are too open.
hadoop4: It is required that your private key files are NOT accessible by others.
hadoop4: This private key will be ignored.
hadoop4: Load key "/home/hduser/.ssh/id_rsa": bad permissions
hadoop4: hduser@hadoop4: Permission denied (publickey,password).
hadoop3: @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
hadoop3: @ WARNING: UNPROTECTED PRIVATE KEY FILE! @
hadoop3: @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
hadoop3: Permissions 0644 for '/home/hduser/.ssh/id_rsa' are too open.
hadoop3: It is required that your private key files are NOT accessible by others.
hadoop3: This private key will be ignored.
hadoop3: Load key "/home/hduser/.ssh/id_rsa": bad permissions
hadoop3: hduser@hadoop3: Permission denied (publickey,password).
hduser@hadoop1:/opt/hadoop/sbin$