Grokking the Advanced System Design Interview
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Quiz: HDFS
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Test your knowledge of HDFS by completing this quiz.

In HDFS, files are divided into ---- blocks.
Choose all correct options
Variable size
Fixed size
Both fixed and variable size
None of the above
Random writes into files in HDFS are
Choose all correct options
Frequent
Very Frequent
Less Frequent
Not possible
What kind of consistency model does HDFS offer?
Choose all correct options
Strong consistency
Weak consistency
Does a file in HDFS smaller than a single block occupy a block's full storage?
Choose all correct options
Yes
No
What is the purpose of secondary NameNode?
Choose all correct options
Secondary and primary NN runs on the same machine.
Secondary NN works as is a backup server and takes control when the primary NN fails.
Secondary NN serves metadata read requests.
Secondary NN periodically merges the EditLog and FsImage and sends the merged image to primary NN.
HDFS is designed after GFS but does not support
Choose all correct options
Concurrent appends.
Partial file reads.
Redundancy for file storage.
Distributing a file's contents across multiple storage servers.
What is the default replication policy in HDFS? Select all that apply.
Choose all correct options
No DataNode will contain more than one replica of any block.
At least one replica should reside in another datacenter.
If there are enough racks available, no rack will contain more than two replicas of the same block.
HDFS always tries to place one replica on the client machine.

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Table of Contents

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