The map-reduce framework is quite useful for creating inverted indices on a setof documents. An inverted index stores for each word a list of all documentIDs that it appears in (offsets in the documents are also normally stored, butwe shall ignore them in this question).For example, if the input document IDs and contents are as follows:1: data clean2: data base3: clean basethen the inverted lists woulddata: 1, 2clean: 1, 3base: 2, 3Give pseudocode for map and reduce functions to create inverted indices on agiven set of files (each file is a document).Assume the document IDis availableusing a function context.getDocumentID(), and the map function is invokedonce per line of the document. The output inverted list for each word should bea list of document IDs separated by commas. The document IDs are normallysorted, but for the purpose of this question you do not need to bother to sortthem.

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Hash Table

A hash table also called a hash map, is a data structure that maps key-value pairs. The hash table can be used in complex systems to provide fast access and compact storage. A hash table is a structure that stores data in an abstract data type kind of associative array. It keeps data in an array format, with a distinct index value for every data value. If the index of the required data is known, then the data can be accessed very easily.