Analyze each scenario below and indentify which best describes the behavior of the default partitioner?

Question

Options

• AThe default partitioner assigns key-values pairs to reduces based on an internal random number
• BThe default partitioner implements a round-robin strategy, shuffling the key-value pairs to each
• CThe default partitioner computers the hash of the key. Hash values between specific ranges are
• DThe default partitioner computers the hash of the key and divides that valule modulo the number
• EThe default partitioner computers the hash of the value and takes the mod of that value with the

• A
  12% (5)
• B
  2% (1)
• C
  5% (2)
• D
  79% (33)
• E
  2% (1)

Explanation

The default partitioner computes a hash value for the key and assigns the partition based on this The default Partitioner implementation is called HashPartitioner. It uses the hashCode() method of the key objects modulo the number of partitions total to determine which partition to send a given (key, value) pair to. In Hadoop, the default partitioner is HashPartitioner, which hashes a record's key to determine which partition (and thus which reducer) the record belongs in.The number of partition is then equal to the number of reduce tasks for the job.

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