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Hadoop Online Quiz
Following quiz provides Multiple Choice Questions (MCQs) related to Hadoop Framework. You will have to read all the given answers and click over the correct answer. If you are not sure about the answer then you can check the answer using Show Answer button. You can use Next Quiz button to check new set of questions in the quiz.
![Questions and Answers](/images/questions_and_answers.png)
Q 1 - In a Hadoop cluster, what is true for a HDFS block that is no longer available due to disk corruption or machine failure?
B - It can be replicated form its alternative locations to other live machines.
C - The namenode allows new client request to keep trying to read it.
D - The Mapreduce job process runs ignoring the block and the data stored in it.
Answer : B
Q 2 - For the frequently accessed HDFS files the blocks are cached in
A - the memory of the datanode
B - in the memory of the namenode
D - In the memory of the client application which requested the access to these files.
Answer : A
Q 3 - What is are true about HDFS?
A - HDFS filesystem can be mounted on a local client’s Filesystem using NFS.
B - HDFS filesystem can never be mounted on a local client’s Filesystem.
C - You can edit a existing record in HDFS file which is already mounted using NFS.
D - You cannot append to a HDFS file which is mounted using NFS.
Answer : A
Q 4 - Underreplication in HDFS means-
A - No replication is happening in the data nodes.
B - Replication process is very slow in the data nodes.
C - The frequency of replication in data nodes is very low.
D - The number of replicated copies is less than as specified by the replication factor.
Answer : D
Q 5 - If the IP address or hostname of a datanode changes
A - The namenode updates the mapping between file name and block name
B - The namenode need not update mapping between file name and block name
Answer : B
Q 7 - To unarchive an already archived file in haddop use the command
Answer : C
Answer : A
Q 9 - Can you run Map - Reduce jobs directly on Avro data?
A - Yes, Avro was specifically designed for data processing via Map-Reduce.
B - Yes, but additional extensive coding is required.
C - No, Avro was specifically designed for data storage only.
Answer : A
Q 10 -What is a Sequence File?
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