Hadoop distributions (Cloudera, Hortonworks) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to show the command that starts the Cloudera Manager service.

Hadoop

sudo systemctl [1] cloudera-scm-server

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

Astart

Bstop

Crestart

Dstatus

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'stop' instead of 'start'.

Using 'status' which only shows service status.

The command sudo systemctl start cloudera-scm-server starts the Cloudera Manager service.

2fill in blank

medium

Complete the code to list all services managed by Hortonworks Ambari.

Hadoop

ambari-server [1]

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

Alist-services

Bstatus

Cstop

Dstart

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'status' which shows Ambari server status only.

Using 'start' or 'stop' which control the server.

The command ambari-server list-services lists all services managed by Ambari.

3fill in blank

hard

Fix the error in the command to check the status of the Hadoop service in Cloudera Manager.

Hadoop

sudo service hadoop-[1] status

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

Aresourcemanager

Bnamenode

Cdatanode

Dnodemanager

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'datanode' which is a worker node service.

Using 'resourcemanager' which manages resources, not filesystem.

The correct service name to check the Hadoop NameNode status is hadoop-namenode.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps service names to their status in Ambari.

Hadoop

service_status = { [1]: ambari_client.get_status([2]) for [1] in services_list }

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

Aservice

Cstatus

Dservices_list

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names for key and function argument.

Using 'status' or 'services_list' as the key.

The dictionary comprehension uses service as the key and calls ambari_client.get_status(service) for each service in services_list.

5fill in blank

hard

Fill all three blanks to filter and create a dictionary of Cloudera services with status 'running'.

Hadoop

running_services = { [1]: [2] for [1] in all_services if [2] == 'running' }

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

Aservice

Bstatus

Cservice_status[service]

Dall_services

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing variable names for keys and values.

Using the wrong variable in the if condition.

The comprehension iterates over all_services using service as key, gets the status from service_status[service], and filters where service_status[service] == 'running'.