Taming the Flood: How I Learned to Stop Worrying and Love the Swarm Yogesh Vedpathak Cleversafe
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1 Taming the Flood: How I Learned to Stop Worrying and Love the Swarm Yogesh Vedpathak Cleversafe
2 Topics Popular data Creating broadcasting storage system Bittorrent protocol Creating swarms and destroying swarms Tracker-less torrent Dealing with uncooperative peers 2
3 Popular Data Trending images and Videos Active for small period of time (hours) Newly released TV shows and movies Active for days or even weeks 3
4 Accessing Popular Data 4
5 Accessing Popular Data The data between downloaders and storage node is redundant The throughput decreases as the number of the downloaders increases The data can be far from the downloader which affects the throughput 5
6 Content Distribution Network 6
7 Content Distribution Network Pros Data is usually closer to the downloaders Server load is balanced Cons Usually expensive because of the infrastructure There are several persistent copies of the data 7
8 Creating broadcast storage system Scaling performance as the number of downloaders increase Keeping the load on storage system bounded Making sure that the storage system delivers unique packets Achieving this without spending a fortune 8
9 Bittorent protocol.torrent file: File and tracker information Tracker: Help downloaders find each other Swarm: Downloaders coordinate with each other to download file in pieces 9
10 Storage System and Bittorrent Protocol Default Seeder 10
11 Default Seeder This is a gateway that can directly communicate with backend storage system The default seeder caches the entire file If the file is popular and there are not enough peers If the file is popular and there are free riders 11
12 Storage System and Bittorrent Protocol Default Seeder 12
13 Storage System and Bittorrent Protocol Default Seeder 13
14 Storage System and Bittorrent Protocol Default Seeder 14
15 When To Create a Swarm Implementing Amazon S3 API GET /quotes/nelson?torrent Selectively return.torrect file with existing interface for your storage system for the objects that are frequently used if storage system is under load do not provide 503 if bittorent overhead is less than file size 15
16 Trackerless implementation The tracker is SPoF in most P2P networks Using the Mainline DHT Distributed method to find peers Instead of using announce key use nodes The Default Seeder acts as bootstrapping node 16
17 Free Riding Peers Conscious Free Riders Inform their partners that they are unwilling or unable to upload data Devices with limited CPU and bandwidth Oblivious Free Riders Do not inform their partners that they are unwilling or unable to upload data Malfunctioning and uncooperative clients 17
18 Latencies Distribution For File Pieces Conscious Free Riders Oblivious Free Riders From Can Peer-to-Peer Live Streaming Systems Coexist with Free Riders? Joa õ F. A. e Oliveira, Ítalo Cunha et al 18
19 Dealing with Uncooperative Peers Chocking/Unchoking is not sufficient Update.torrent to exclude uncooperative peers This prevents new peers from talking to uncooperative peers Different billing rates Bill normal for direct access to the object Discount for swarm with no free riders Free access for swarm with free riders 19
20 Destroying The Swarm Default seeder keeps track of active peers If the there are no active peers the file can be cleared from cache on Default seeder Nullify the nodes in.torrent file so there is no swarm 20
21 Conclusion A swarm is created as the popularity of the data increases A swarm can help scale the throughput of the storage system Uncooperative peers are challenging but the impact can be curbed by different billing rates The swarm eventually disappears as the data is no longer popular 21
22 Questions & Answers Yogesh Vedpathak 22
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