Gfs介绍

GFS: The Google File System Brad Karp UCL Computer Science CS Z03 / 4030 30 th October, 2006

Motivating Application: Google ,[object Object],[object Object],[object Object],[object Object],[object Object]

Cluster of PCs as Supercomputer ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],GFS: File system for sharing data on clusters, designed with Google’s application workload specifically in mind

Google Platform Characteristics ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Google File System: Design Criteria ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

GFS: Architecture ,[object Object],[object Object],[object Object],[object Object],[object Object]

Master Server ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Holds all metadata in RAM; very fast operations on file system metadata

Chunkserver ,[object Object],[object Object],[object Object],[object Object]

Client ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Client API ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Client Read ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Client Write ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Client Write (2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

GFS: Consistency Model ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

GFS: Data Mutation Consistency ,[object Object],[object Object],inconsistent failure consistent but undefined concurrent success defined interspersed with inconsistent defined serial success Record Append Write

Applications and Record Append Semantics ,[object Object],[object Object],[object Object],[object Object]

Logging at Master ,[object Object],[object Object],[object Object],[object Object],[object Object]

Chunk Leases and Version Numbers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

What If the Master Reboots? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

What if Chunkserver Fails? ,[object Object],[object Object],[object Object],[object Object]

File Deletion ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

GFS: Summary ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Gfs介绍

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Gfs介绍