Dead Datanodes

[#1]

Hi,

I am installing cloudera manager, however when I check the memory with command hdfs dfsadmin -report, i can see that i have 1 dead datanode. How can I bring it lo live again?

Thanks,

Regards,

[#2]

Could you paste here your logs? Should be under /var/log/hadoop-*

Which version have you installed ?


Regards

[#3]

Thanks,

How can I check /var/log/hadoop-*?

Thanks,
Regards,

[#4]

is your Cloudera installed on Linux or Windows

Linux:

Log on to the dead datanode and go /var/log/hadoop-hdfs/ You should see your log files there. You can print it using "cat"

Windows: Check your hdfs config and see whare are your log installed.

[#5]

Thanks, you mean as hdfs user?

[#6]

or with your root account...

regards

[#7]

Yes, should i look for something specific? The log file has a lot of information.
Thanks,
Regards,

[#8]

you should check when your node is failing. Try to start the roles again and keep an eye on this, then, paste the error information

[#9]

Soory to ask but could you please tell me how to start the roles again?
Thanks a lot,

[#10]

https://www.cloudera.com/documentation/enterprise/5-4-x/topics/cdh_sg_datanode_start.html

[#11]

How can I know the IP that I have to set in the host file? Thanks!

[#12]

I can not see errors in the log. What should I do to get the node alive?