Describe the Nature and Use of MapReduce and Apache Hadoop DATA-SCIENCE-FOUNDATIONS Practice Questions (Page 6)

Questions 26–29

1. 26foundation · easy

   Which scenario is a typical use case for Apache Hadoop?

   • AProcessing large volumes of log files in batch mode
   • BStoring and querying a small relational database with ACID transactions
   • CRunning a lightweight web server for a small website
   • DServing real-time user requests with sub-millisecond latency
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2. 27foundation · easy

   In Hadoop's master-slave architecture, what is the function of the NameNode?

   • ATo replicate data blocks across the cluster
   • BTo store the actual data blocks of files
   • CTo schedule and monitor MapReduce jobs
   • DTo manage the file system namespace and metadata
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4. 28foundation · easy

   In the Apache Hadoop ecosystem, what is the primary role of YARN?

   • ATo manage cluster resources and schedule jobs
   • BTo provide a distributed file system for storing large datasets
   • CTo store metadata about files in the cluster
   • DTo execute MapReduce jobs directly on the data nodes
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5. 29application · medium

   A Hadoop administrator notices that a DataNode has failed. The NameNode is still healthy. What is the immediate impact on the cluster's ability to serve read requests for files that had blocks on that DataNode?

   • AThe cluster will enter safe mode and stop all reads.
   • BRead requests for those blocks will fail permanently.
   • CThe NameNode will restart the failed DataNode automatically.
   • DRead requests will be served from the replicas on other DataNodes.
   Reveal Solution Discussion Select an answer first