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Hadoop File System Basics

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Questions and Answers

What is the main emphasis of HDFS architecture?

Interactive use by users

Parallel processing of data

Low latency of data access

High throughput of data access (correct)

Which guiding principle of HDFS architecture emphasizes support for file sizes of gigabytes to petabytes?

Simple Coherency Model

Large Data Sets (correct)

Streaming Data Access

Tolerance of Hardware Failure

In HDFS, what pattern is considered the most efficient data processing pattern?

Read-once write-once pattern (correct)

Read-many-times write-once pattern

Random access pattern

Write-many-times read-once pattern

What is the purpose of HDFS Compression?

To save space and optimize storage utilization Signup and view all the answers

Where is the EditLog stored in HDFS?

In the NameNode's local file system Signup and view all the answers

What does the NameNode maintain in HDFS?

The complete state of the file system namespace Signup and view all the answers

What is the purpose of checksums in HDFS?

To verify integrity and detect data corruption Signup and view all the answers

What happens if a checksum verification fails in HDFS?

HDFS attempts to repair the corrupted data block using a good copy from another DataNode Signup and view all the answers

What can cause an entire HDFS instance to become non-functional?

Corruption of the FsImage and EditLog files Signup and view all the answers

How does HDFS address the potential single point of failure in the NameNode?

By configuring a secondary NameNode for manual intervention in case of emergency Signup and view all the answers