Crossword Puzzle on Hadoop ad Mapreduce

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Across
  1. 3. ---- contains actual copy of data block
  2. 4. Hadoop Storage Component
  3. 6. Mini Reducer
  4. 7. this relational algebra operation selects perticular columns from relation
Down
  1. 1. Opensource Framework to store and process Big Data
  2. 2. Hadoop Programming Component
  3. 5. shuffling sorting takes place at-----