Configuring Hadoop daemon logging

System logging plays an important role in dealing with performance and security problems. In addition, the logging information can be used analytically to tune the performance of a Hadoop cluster. In this recipe, we will show you how to configure Hadoop logging.

Getting ready

We assume that our Hadoop cluster has been properly configured.

How to do it...

Perform the following steps to configure Hadoop logging:

  1. Log in to the master node with the following command from the Hadoop administrator machine:
    ssh hduser@master
    
  2. Check the current logging level of JobTracker with the following command:
    hadoop daemonlog -getlevel master:50030 org.apache.hadoop.mapred.JobTracker
    

    We will get an output similar to the following:

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