Adaptive Join Plan Generation in Hadoop For CPS 296 . 1 Course Project

  title={Adaptive Join Plan Generation in Hadoop For CPS 296 . 1 Course Project},
  author={Gang Luo},
Joins in Hadoop has always been a problem for its users: the Map/Reduce framework seems to be specifically designed for group-by aggregation tasks rather than across-table operations; on the other hand, join operation in distributed database systems was never an easy task because data location and skewness makes join strategies harder to optimize. Fragment-replicate join (map join) may be a clever step towards good performance in some cases, but it can be a dangerous move under certain… CONTINUE READING

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