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.
We assume that our Hadoop cluster has been properly configured.
Perform the following steps to configure Hadoop logging:
hadoop daemonlog -getlevel master:50030 org.apache.hadoop.mapred.JobTracker
We will get an output similar to the following: