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MapReduce

  • Index construction was just one phase.

  • Another phase: transforming a term-partitioned index into a document-partitioned index.

    • Term-partitioned: one machine handles a subrange of terms

    • Document-partitioned: one machine handles a subrange of documents

  • As we’ll discuss in the web part of the course, most search engines use a document-partitioned index … better load balancing, etc.


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