Problem with hadoop

Mapreduce job stuck at map 0% reduce 0%

Error Scenario: Mapreduce job stuck at map 0% reduce 0%. : Could not resolve hostname

Mapreduce jobs are not running. And the below error message is coming when starting HDFS daemons.

Resolution: These above error messages are received when there is some issue with ssh communication. So, in these situations, we need to remove openssh-client and openssh-server and re-install them again.

Once the ssh is re-installed, we will […]

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I am a plsql developer. Intrested to move into bigdata.

Neetika Singh ITA