GFS: The Google File System

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Client Write • Some chunkserver is primary for each chunk – Master grants lease to primary (typically for 60 sec.) – Leases renewed using periodic heartbeat messages between master and chunkservers • Client asks master for primary and secondary replicas for each chunk • Client sends data to replicas in daisy chain – Pipelined: each replica forwards as it receives – Takes advantage of full-duplex Ethernet links 16
Client Write (2) 17
Page 1 and 2: GFS: The Google File System Michael
Page 5 and 6: Google Platform Characteristics •
Page 8 and 9: Google File System: Design Criteria
Page 10 and 11: GFS: Architecture (2) 10
Page 12 and 13: Chunkserver • Stores 64 MB file c
Page 14 and 15: Client API • Not a filesystem in
Page 18 and 19: Client Write (3) • All replicas a
Page 20 and 21: Client Record Append (2) • When d
Page 22 and 23: GFS: Consistency Model (2) • Chan
Page 24 and 25: Applications and Record Append Sema
Page 26 and 27: Chunk Leases and Version Numbers
Page 28 and 29: What if Chunkserver Fails? • Mast
Page 30: Limitations • Security? - Trusted
Page 37: Recovery Time • Experiment: kille

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