公开(公告)号：US10152535B1

公开(公告)日：2018-12-11

申请号：US14057681

申请日：2013-10-18

Applicant: GOOGLE INC.

Inventor： Pei Cao ,  Sohem Mazumdar

IPC: G06F17/30

Abstract: An information retrieval system uses phrases to index, retrieve, organize and describe documents. Phrases are extracted from the document collection. Documents are the indexed according to their included phrases, using phrase posting lists. The phrase posting lists are stored in an cluster of index servers. The phrase posting lists can be tiered into groups, and sharded into partitions. Phrases in a query are identified based on possible phrasifications. A query schedule based on the phrases is created from the phrases, and then optimized to reduce query processing and communication costs. The execution of the query schedule is managed to further reduce or eliminate query processing operations at various ones of the index servers.