YARN command daemonlog and YARN command nodemanager

This recipe explains YARN command daemonlog and YARN command nodemanager

Recipe Objective: YARN command: daemonlog & YARN command: nodemanager

YARN (Yet Another Resource Negotiator) effectively distributed the work of the Job Tracker to the Resource Manager and the Application Masters and focused only on resource management. This helped overcome the problem of the Job Tracker being a single point of failure in Hadoop 1.x. Additionally, YARN also helped improve the system's scalability as the number of possible Maps and Reduce slots depended directly on the Job Tracker. YARN also allowed other data processing frameworks, such as Tez and Spark to process data. After Hadoop v2.4, a standby Resource Manager was added with automatic failover support, making YARN fault-tolerant.

In this recipe, we work with the YARN commands: daemonlog and nodemanager.

Prerequisites:

Before proceeding with the recipe, make sure Single node Hadoop is installed on your local EC2 instance and YARN is set up. If not, follow the below links to do the same.

Steps to set up an environment:

  • In the AWS, create an EC2 instance and log in to Cloudera Manager with your public IP mentioned in the EC2 instance. Login to putty/terminal and check if Hadoop is up and running. Type "&ltyour public IP&gt:7180" in the web browser and log in to Cloudera Manager, where you can check if HDFS and YARN services are active in your CDH cluster.
  • If they are not visible in the Cloudera cluster, you may add them by clicking on the "Add Services" in the cluster to add the required services in your local instance.

YARN command: daemonlog

The command yarn daemonlog [option] is a YARN administrative command of a Hadoop cluster. The options listed for this command are -getlevel and -setlevel.

yarn daemonlog -getlevel &lthost:httpport&gt &ltclassname&gt

This prints the log level identified by a qualified &ltclassname&gt, in the daemon running at &lthost:httpport&gt. This command internally connects to the http://&lthostport&gt/logLevel?log=&ltclassname&gt

yarn daemonlog -setlevel &lthost:httpport&gt &ltclassname&gt &ltlevel&gt

This command sets the log level identified by a qualified &ltclassname&gt in the daemon running at &lthost:httpport&gt. This command internally connects to http://&lthost:httpport&gt/logLevel?log=&ltclassname&gt&level=&ltlevel&gt

YARN command: nodemanager

The command yarn nodemanager starts the Node Manager. Sample output upon starting the Node Manager is given below.

bigdata_1

 

bigdata_2

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