NameNode: HDFS metadata (directory, block locations). Single point. If down: HDFS unavailable. Mitigation: HA with standby + ZooKeeper failover; shared edits. Backup: namespace to NFS; Secondary NameNode checkpoints. WHY: Always HA in prod; test failover; runbooks....
This easy-level General/Other question appears frequently in data engineering interviews at companies like Microsoft. While less common, it tests deeper understanding that distinguishes strong candidates.
Start by clearly defining the core concept being asked about. Interviewers want to see that you understand the fundamentals before diving into implementation details. Structure your answer with a definition, then explain the practical application with a concise example.
NameNode: HDFS metadata (directory, block locations). Single point. If down: HDFS unavailable. Mitigation: HA with standby + ZooKeeper failover; shared edits. Backup: namespace to NFS; Secondary NameNode checkpoints. WHY: Always HA in prod; test failover; runbooks. Cloud: EMR managed or S3 to reduce SPOF.
Want feedback on your answer?
Paste your answer to this question and our AI Coach scores it, finds gaps, and shows you the FAANG-level version.
Get the most asked SQL questions with expert answers. Instant download.
No spam. Unsubscribe anytime.
Paste your answer and get instant AI feedback with a FAANG-level improved version.
Analyze My Answer — FreeAccording to DataEngPrep.tech, this is one of the most frequently asked General/Other interview questions, reported at 1 company. DataEngPrep.tech maintains a curated database of 1,863+ real data engineering interview questions across 7 categories, verified by industry professionals.