IBM Certified Data Architect - Big Data Certification Questions and Answers (Dumps and Practice Questions)

Question : How blocks are stored in HDFS

1. As a binary file
2. As a decoded file
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4. Stored as archived


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Blocks are stored as standard files on the DataNodes, in a set of directories specified in
Hadoop's configuration files






Question :

Which is the correct option for accessing the file which is stored in HDFS


1. Application can read and write files in HDFS using JAVA API
2. There is a command line option to access the files
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4. 1,2 and 3 are correct
5. 1 and 2 are correct

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Application can access the files using Java API and typically the files are created in the local filesystem and
then moved to the HDFS, there is also one command hadoop fs which is used to access the files in HDFS




Question : Which is the correct command to copy files from local to HDFS file systems

1. hadoop fs -copy pappu.txt pappu.txt
2. hadoop fs -copyFromPath pappu.txt pappu.txt
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4. None of the above

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Related Questions

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Question : When you submitted your MapReduce job on YARN framework, Which of the following component is responsible
for monitoring resource usage e.g. CPU,memory, disk,network on individual nodes.

1. Resource Manager
2. Application Master

3. Node Manager

4. NameNode



Question : Map the following in case of YARN

1. YARN Resource Manager
2. YARN Node Managers
3. MapReduce Application Master

a. which launch and monitor the tasks of jobs
b. allocates the cluster resources to jobs
c. which coordinates the tasks running in the MapReduce job


1. 1-a, 2-b,3-c
2. 1-b, 2-a,3-c
3. 1-c, 2-a,3-b
4. 1-a, 2-c,3-b


Question : Developer has submitted the YARN Job, by calling submitApplication() method on Resource Manager.
Please select the correct order of the below steps after that

1. Container will be managed by Node Manager after job submission
2. Resource Manager triggers its sub-component Scheduler, which allocates containers for mapreduce job execution.
3. Resource Manager starts Application Master in the container


1. 2,3,1
2. 1,2,3
3. 2,1,3
4. 1,3,2


Question : Which of the following are responsibilities of the ApplicationMater

1. Before starting any task, create job's output directory for job's OutputCommitter.
2. Both map tasks and reduce tasks are created by Application Master.
3. If the submitted job is small, then Application Master runs the job in the same JVM on which Application Master is running.
4. If job doesn't qualify as Uber task, Application Master requests containers for all map tasks and reduce tasks.


1. 1,2,3
2. 2,3,4
3. 1,3,4
4. 1,2,4
5. 1,2,3,4



Question : Which of the following are the steps followed as part of TaskExecution

1. Once Containers assigned to tasks, Application Master starts containers by notifying its Node Manager.
2. Application Master copies Job resources (like job JAR file) from HDFS distributed cache and runs map or reduce tasks.
3. Node Manager copies Job resources (like job JAR file) from HDFS distributed cache and runs map or reduce tasks.
4. Running Tasks, keep reporting about the progress and status (Including counters) of current
task to Application Master and Application Master collects this progress information from all tasks and
aggregate values are propagated to Client Node or user.


1. 1,2,3
2. 2,3,4
3. 3,4,1
4. 1,3,4
5. 1,2,3,4





Question : Which of the following component in the MRv maintains the History of the JOB


1. MapReduce Server
2. MapReduce JobHistory Server
3. Application Master
4. 2 and 3
5. 1 , 2 and 3