Google File Systemgoogle file system, google file system architecture
Google File System GFS or GoogleFS is a proprietary distributed file system developed by Google to provide efficient, reliable access to data using large clusters of commodity hardware A new version of Google File System code named Colossus was released in 2010
- 1 Design
- 2 Performance
- 3 See also
- 4 References
- 5 Bibliography
- 6 External links
DesignGoogle File System is designed for system-to-system interaction, and not for user-to-system interaction The chunk servers replicate the data automatically
GFS is enhanced for Google's core data storage and usage needs primarily the search engine, which can generate enormous amounts of data that needs to be retained; Google File System grew out of an earlier Google effort, "BigFiles", developed by Larry Page and Sergey Brin in the early days of Google, while it was still located in Stanford Files are divided into fixed-size chunks of 64 megabytes, similar to clusters or sectors in regular file systems, which are only extremely rarely overwritten, or shrunk; files are usually appended to or read It is also designed and optimized to run on Google's computing clusters, dense nodes which consist of cheap "commodity" computers, which means precautions must be taken against the high failure rate of individual nodes and the subsequent data loss Other design decisions select for high data throughputs, even when it comes at the cost of latency
A GFS cluster consists of multiple nodes These nodes are divided into two types:one Master node and a large number of Chunkservers Each file is divided into fixed-size chunks Chunk servers store these chunks Each chunk is assigned a unique 64-bit label by the master node at the time of creation, and logical mappings of files to constituent chunks are maintained Each chunk is replicated several times throughout the network, with the minimum being three, but even more for files that have high end-in demand or need more redundancy
The Master server does not usually store the actual chunks, but rather all the metadata associated with the chunks, such as the tables mapping the 64-bit labels to chunk locations and the files they make up, the locations of the copies of the chunks, what processes are reading or writing to a particular chunk, or taking a "snapshot" of the chunk pursuant to replicate it usually at the instigation of the Master server, when, due to node failures, the number of copies of a chunk has fallen beneath the set number All this metadata is kept current by the Master server periodically receiving updates from each chunk server "Heart-beat messages"
Permissions for modifications are handled by a system of time-limited, expiring "leases", where the Master server grants permission to a process for a finite period of time during which no other process will be granted permission by the Master server to modify the chunk The modifying chunkserver, which is always the primary chunk holder, then propagates the changes to the chunkservers with the backup copies The changes are not saved until all chunkservers acknowledge, thus guaranteeing the completion and atomicity of the operation
Programs access the chunks by first querying the Master server for the locations of the desired chunks; if the chunks are not being operated on ie no outstanding leases exist, the Master replies with the locations, and the program then contacts and receives the data from the chunkserver directly similar to Kazaa and its supernodes
Unlike most other file systems, GFS is not implemented in the kernel of an operating system, but is instead provided as a userspace library
Deciding from benchmarking results, when used with relatively small number of servers 15, the file system achieves reading performance comparable to that of a single disk 80–100 MB/s, but has a reduced write performance 30 MB/s, and is relatively slow 5 MB/s in appending data to existing files The authors present no results on random seek time As the master node is not directly involved in data reading the data are passed from the chunk server directly to the reading client, the read rate increases significantly with the number of chunk servers, achieving 583 MB/s for 342 nodes Aggregating a large number of servers also allows big capacity, while it is somewhat reduced by storing data in three independent locations to provide redundancy
- Cloud storage
- Fossil, the native file system of Plan 9
- GPFS IBM's General Parallel File System
- GFS2 Red Hat's Global Filesystem 2
- Hadoop and its "Hadoop Distributed File System" HDFS, an open source Java product similar to GFS
- List of Google products
- ^ "Google's Colossus Makes Search Real-Time by Dumping MapReduce", High Scalability World Wide Web log, 2010-09-11
- ^ "Colossus:Successor to the Google File System GFS" SysTutorials 2012-11-29 Retrieved 2016-05-10
- ^ Ghemawat, Gobioff & Leung 2003
- Ghemawat, S; Gobioff, H; Leung, S T 2003 "The Google file system" Proceedings of the nineteenth ACM Symposium on Operating Systems Principles - SOSP '03 PDF p 29 CiteSeerX 1011125789 doi:101145/945445945450 ISBN 1581137575
- "GFS:Evolution on Fast-forward", Queue, ACM
- "Google File System Eval, Part I", Storage mojo
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