hello, We configured hadoop successfully, but after some days its configuration file from datanode( hadoop-site.xml) went off , and datanode was not coming up ,so we again did the same configuration, its showing one datanode and its name as localhost rather than expected as either name of respected datanode m/c or ip address of actual datanode in ui interfece of hadoop.
But capacity as 80.0gb ,(we have one namenode (40 gb) and datanode(40 gb))means capacity is updated ,we can browse the filesystem , it is showing whatever directories we are creating in namenode . but when we try to access the same through the datanode machine means doing ssh and executing series of commands its not able to connect to the server. saying retrying connect to the server 09/03/26 11:25:11 INFO ipc.Client: Retrying connect to server: / 172.16.6.102:21011. Already tried 0 time(s). 09/03/26 11:25:11 INFO ipc.Client: Retrying connect to server: / 172.16.6.102:21011. Already tried 1 time(s) moreover we added one datanode into it and formatted namenode ,but that datanode is not getting added. we are not understanding whats the problem. Can configuration files in case of datanode automatcally lost after some days?? I have again one doubt , according to my understanding namenode doesnt store any data , it stores metadata of all the data , so when i execute mkdir in namenode machine and copying some files into it, it means that data is getting stored in datanode provided to it, please correct me if i am wrong , i am very new to hadoop. So if i am able to view the data through inteface means its properly storing data into respected datanode, So why its showing localhost as datanode name rather than respected datanode name. can you please help. Regards, Snehal Nagmote IIIT hyderabad
