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Total Questions : 10
Question 1. ________ instances are encoded using the number of bytes declared in the schema.
  1.    Fixed
  2.    Enum
  3.    Unions
  4.    Maps
 Discuss Question
Answer: Option A. -> Fixed


Except for unions, the JSON encoding is the same as is used to encode field default values.


Question 2. Thrift resolves possible conflicts through _________ of the field.
  1.    Name
  2.    Static number
  3.    UID
  4.    None of the mentioned
 Discuss Question
Answer: Option B. -> Static number


Avro resolves possible conflicts through the name of the field.


Question 3. ________ permits data written by one system to be efficiently sorted by another system.
  1.    Complex Data type
  2.    Order
  3.    Sort Order
  4.    All of the mentioned
 Discuss Question
Answer: Option C. -> Sort Order


Avro binary-encoded data can be efficiently ordered without deserializing it to objects.


Question 4. ________ are a way of encoding structured data in an efficient yet extensible format.
  1.    Thrift
  2.    Protocol Buffers
  3.    Avro
  4.    None of the mentioned
 Discuss Question
Answer: Option B. -> Protocol Buffers


Google uses Protocol Buffers for almost all of its internal RPC protocols and file formats.


Question 5. Which of the following is the slowest compression technique ?
  1.    LZO
  2.    Bzip2
  3.    Gzip
  4.    All of the mentioned
 Discuss Question
Answer: Option B. -> Bzip2


Of all the available compression codecs in Hadoop, Bzip2 is by far the slowest.


Question 6. Gzip (short for GNU zip) generates compressed files that have a _________ extension.
  1.    .gzip
  2.    .gz
  3.    .gzp
  4.    .g
 Discuss Question
Answer: Option B. -> .gz


You can use the gunzip command to decompress files that were created by a number of compression utilities, including Gzip.


Question 7. The ____________ class extends and implements several Hadoop-supplied interfaces.
  1.    AvroReducer
  2.    Mapper
  3.    AvroMapper
  4.    None of the mentioned
 Discuss Question
Answer: Option C. -> AvroMapper


AvroMapper is used to provide the ability to collect or map data.


Question 8. Which of the following format is more compression-aggressive ?
  1.    Partition Compressed
  2.    Record Compressed
  3.    Block-Compressed
  4.    Uncompressed
 Discuss Question
Answer: Option C. -> Block-Compressed


SequenceFile key-value list can be just a Text/Text pair, and is written to the file during the initialization that happens in the SequenceFile.


Question 9. __________ support storing a copy of data at a particular instant of time.
  1.    Data Image
  2.    Datanots
  3.    Snapshots
  4.    All of the mentioned
 Discuss Question
Answer: Option C. -> Snapshots


One usage of the snapshot feature may be to roll back a corrupted HDFS instance to a previously known good point in time.


Question 10. Automatic restart and ____________ of the NameNode software to another machine is not supported.
  1.    failover
  2.    end
  3.    scalability
  4.    All of the mentioned
 Discuss Question
Answer: Option A. -> failover


If the NameNode machine fails, manual intervention is necessary.


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