Building a Highly Efficient Inverted Index in Scala: Parallel Processing with Multiple Threads

This article demonstrates how to build a highly efficient inverted index in Scala for fast document lookup. The author begins by explaining the working principle of an inverted index, then progressively implements an `InvertedIndex` class capable of adding words and retrieving documents containing specific words. To boost efficiency, multi-threaded parallel processing is employed, dividing files into groups for parallel index generation, followed by merging the results. The article also touches upon text processing details, such as stop word removal and stemming.