Pre-fetching data segments stored in a dispersed storage network

摘要

A method begins by a processing module receiving a data segment retrieval request regarding a data segment, which is stored in a dispersed storage network (DSN) memory. The method continues with the processing module processing the data segment retrieval request, determining pre-fetch segment buffering information, and when the pre-fetch segment buffering information indicates pre-fetching one or more other data segments, generating one or more pre-fetch segment retrieval requests for the one or more other data segments, receiving, one or more sets of at least a decode threshold number of encoded data slices, decoding, in accordance with a dispersed storage error coding function, the one or more sets of at least a decode threshold number of encoded data slices to reproduce the one or more other data segments, and updating a pre-fetch segment buffer with the one or more other data segments.

主权项

1. A method comprises:
receiving a data segment retrieval request regarding a data segment of a plurality of data segments, wherein the data segment is encoded in accordance with a dispersed storage error coding function to produce a set of encoded data slices, which is stored in a set of dispersed storage (DS) units of a dispersed storage network (DSN) memory; and in response to the data segment retrieval request:
processing the data segment retrieval request;determining pre-fetch segment buffering information based on the data segment, content of a pre-fetch segment buffer, a data consumption rate, and DS unit response rate; andwhen the pre-fetch segment buffering information indicates pre-fetching one or more other data segments of the plurality of data segments:
generating one or more pre-fetch segment retrieval requests for the one or more other data segments;receiving, in response to the one or more pre-fetch segment retrieval requests, one or more sets of at least a decode threshold number of encoded data slices;decoding, in accordance with the dispersed storage error coding function, the one or more sets of at least the decode threshold number of encoded data slices to reproduce the one or more other data segments; andupdating the pre-fetch segment buffer with the one or more other data segments.