UNIT-4

Which type of join in MapReduce processes data from two different datasets where both datasets have a matching key?

• Reduce-side join

• Map-side join

• Cross join

• Semi-join

Which join technique in Hadoop performs the join operation before the data reaches the reducer?

• Reduce-side join

• Map-side join

• Broadcast join

• Inner join

Which MapReduce join technique is the most efficient when one dataset is significantly smaller than the other?

• Reduce-side join

• Distributed cache join

• Semi-join

• Outer join

Which algorithm is commonly used for shortest path computation in a large-scale distributed graph using Hadoop?

• Dijkstra's Algorithm

• PageRank

• Bellman-Ford Algorithm

• Breadth-First Search (BFS)

PageRank algorithm, used by search engines, is typically implemented using which Hadoop framework?

• Pig

• Mahout

• Giraph

• Hive

Which of the following is an advantage of using MapReduce for graph processing?

• Easy iteration over graph nodes

• Automatic handling of iterative processing

• Scalability for large graphs

• Efficient in-memory processing

Which data serialization framework is commonly used for language-independent data in Hadoop?

• JSON

• XML

• Avro

• Parquet

Which file format is optimized for columnar storage in Hadoop?

• Avro

• Parquet

• CSV

• SequenceFile

Which of the following Hadoop data formats supports schema evolution?

• JSON

• Avro

• SequenceFile

• ORC

Which file in Hadoop is used to define the NameNode and DataNode locations?

• core-site.xml

• hdfs-site.xml

• mapred-site.xml

• yarn-site.xml