Peer-to-peer system in distributed system. Mạng ngang hàng

1. PEER-TO-PEER SYSTEMS
Presenter: Thai Le Huy
Hanoi, April 2019
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2. CONTENTS
1. Introduce
2. Peer-to-peer system
3. Middleware
4. Routing overlay
5. Timeline
6. Comparison with client/server model
7. Advantages and disadvantages
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3. 3
I. Introduce

4. Is considered to be a type of network
architecture composed of contributors
that make their resources available to
other contributors on the same
network without the need for a server
to oversee the transfer of information
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II. Peer-to-peer system

5. 1. P2P networking architecture
- Is generally formed dynamically by an adhoc type of addition
of nodes.
- This aspect of peer-to-peer networks gives the system the
ability to easily scale.
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II. Peer-to-peer system

6. 2. Type of P2P
There are generally two major types, Structured and Unstructured.
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II. Peer-to-peer system

7. - To be considered an unstructured peer-to-peer network, the
network must not use any algorithm for organization or optimization
of the network(Randomized algrithm).
- there are three different models which include Pure peer-to-peer ,
Hybrid peer-to-peer, and Centralized peer-to-peer networks.
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2. Type of P2P
a) Unstructured
II. Peer-to-peer system

8. Pure peer-to-peer
- Sometimes called a purely decentralized network, all nodes are
of equal ability meaning that there are no nodes that have any special
infrastructure function that could affect the network.
- A great example of a popular purely decentralized peer-to-peer
network is the Gnutella network. The main purpose of the Gnutella
network is for that of a file sharing system
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9. Centralized peer-to-peer
- Infrastructural nodes are allowed to exist and are often a type of
central directory server.
- All clients connected to the network must connect to one of
these servers.
- Users connection information and List of files are saved in the
central server.
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10. Hybird peer-to-peer
- Added Supernodes.
- Nodes that are dynamically assigned the task of
servicing a small subpart of the peer network by indexing
and caching files contained therein.
- A popular example of this centralized peer-to-peer
network is the file sharing network Kazaa.
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11. - Structured peer-to-peer networks generally hold the traits
of using some type of algorithm for organization or optimization
of the network.
- To use some type of global protocol to ensure that any node
in the network can proficiently route a search to some peer that
has a desired file.
- By far the most popular type of structured peer-to-peer
network is the distributed hash table (DHT).
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II. Peer-to-peer system
2. Type of P2P
b) Structured

12. III. Peer to peer middleware
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13. IV. Routing overley
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- GUID is an acronym for 'Globally Unique
Identifier'. It is a 128-bit integer number used to
identify resources and show by 32 hexas.
- For example:
1EC2020-3AEA-1069-A2DD-08002B30309D

14. IV. Routing overley
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1 . Overlay case studies:
a) Pastry
b) Tapestry
c) Squirrel
d) Ocean Store file store
e) Ivy file system

15. V. P2P developmental processing timeline
1969 1979 1999 2000 2001 2009
Today
Generation 3
Bittorent
Generation 2
Napster
USENET
Generation 1
ARPANET Gnutella, Freenet Bitcoin
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16. VI. Comparison between Client/server
and P2P model
- Unlikely, Client/Server networks peers in P2P don’t rely one single
source for acquiring their necessities. Multiple Participants are
involved.
- P2P is relatively cheaper to setup and simpler than client server
networks.
- P2P can operate on a basic PC operating system whereas
Client/Server networks require special OS.
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17. VII. Advantages and disadvantages
- Their ability to exploit unused resources (storage, processing) in the
host computers;
- Their scalability to support large numbers of clients and hosts with
excellent balancing of the loads on network links and host computing
resources;
- The self-organizing properties of the middleware platforms which
result in support costs that are largely independent of the numbers of
clients and hosts deployed.
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1. Advantages

18. - Their using for the storage of mutable data is relatively costly
compared to a trusted, centralized service;
- The promising basis that they provide for client and host anonymity
has not yet resulted in strong guarantees of anonymity
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VII. Advantages and disadvantages
2. Disadvantages

19. Thanks for attention!
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