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New Contributor
Posts: 6
Registered: ‎05-12-2017

Dead Datanodes

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,

Explorer
Posts: 11
Registered: ‎05-03-2017

Re: Dead Datanodes

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

Which version have you installed ?


Regards

New Contributor
Posts: 11
Registered: ‎05-16-2017

Re: Dead Datanodes

Thanks,

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

Thanks,
Regards,
Explorer
Posts: 11
Registered: ‎05-03-2017

Re: Dead Datanodes

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.

 

 

New Contributor
Posts: 11
Registered: ‎05-16-2017

Re: Dead Datanodes

Thanks, you mean as hdfs user?
Explorer
Posts: 11
Registered: ‎05-03-2017

Re: Dead Datanodes

or with your root account...

 

regards

New Contributor
Posts: 6
Registered: ‎05-12-2017

Re: Dead Datanodes

Yes, should i look for something specific? The log file has a lot of information.
Thanks,
Regards,
Explorer
Posts: 11
Registered: ‎05-03-2017

Re: Dead Datanodes

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

New Contributor
Posts: 6
Registered: ‎05-12-2017

Re: Dead Datanodes

Soory to ask but could you please tell me how to start the roles again?
Thanks a lot,
Explorer
Posts: 11
Registered: ‎05-03-2017
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