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What is a bloom filter used for in big data storage?

  1. A Quickly determining that a key is definitely not present, avoiding an unnecessary read
  2. B Compressing columns
  3. C Encrypting data
  4. D Balancing partitions
Answer

Quickly determining that a key is definitely not present, avoiding an unnecessary read

It can return false positives but never false negatives, which is exactly the property needed to skip reads safely.

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