HDFS

  • HDFS node types. What is the purpose of each of them?

  • How HDFS achieves Fault Tolerance?

  • Block size. Physical space allocation of blocks.

  • Small files problem. Small file problem solutions

  • What is rack and rack awareness? Data locality.

  • How does name node mange meta data fsimage; editlogs, SecondaryNameNode

  • Describe High Availability

  • What are differences between CheckpointingNameNode and BackupNameNode?

  • Namespaces and Federation

  • Analyze the benefits and challenges of the HDFS architecture.

  • File Formats. Describe and compare these file formats: ORC, Sequence; Avro; JSON

  • HDFS VS S3 VS Azure Blob storage

  • HDFS regarding CAP theorem

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