ResourceManager and NodeManager in Hadoop - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to start the ResourceManager service in Hadoop.

Hadoop

start-[1].sh

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AResourceManager

BDataNode

CNodeManager

DNameNode

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'NodeManager' instead of 'ResourceManager' in the script name.

Confusing DataNode or NameNode with ResourceManager.

The ResourceManager is started using the start-ResourceManager.sh script.

2fill in blank

medium

Complete the code to check the status of the NodeManager service.

Hadoop

yarn [1] nodemanager

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Astart

Brestart

Cstop

Dstatus

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'start' or 'stop' instead of 'status'.

Confusing the command syntax for service management.

The command yarn status nodemanager checks the status of the NodeManager service.

3fill in blank

hard

Fix the error in the command to list all NodeManagers registered with the ResourceManager.

Hadoop

yarn [1] nodemanagers

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Alist

Bstatus

Cstart

Dstop

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'status' which checks one service, not lists all.

Using 'start' or 'stop' which control services, not list them.

The correct command is yarn list nodemanagers to list all NodeManagers registered.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps NodeManager hostnames to their memory capacity if memory is greater than 8192 MB.

Hadoop

{node['[1]']: node['[2]'] for node in nodes if node['memory'] > 8192}

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Ahostname

Bmemory

Ccpu

Ddisk

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'cpu' or 'disk' instead of 'memory' for values.

Using 'memory' as keys instead of 'hostname'.

The dictionary keys are hostnames and values are memory capacities, filtered by memory > 8192 MB.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps uppercase hostnames to their CPU cores if cores are greater than 4.

Hadoop

{node['[1]'].[2](): node['[3]'] for node in nodes if node['cores'] > 4}

Drag options to blanks, or click blank then click option'

Ahostname

Bupper

Ccores

Dlower

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'lower' instead of 'upper' for string method.

Using 'cores' as keys instead of values.

The dictionary keys are uppercase hostnames and values are CPU cores, filtered by cores > 4.