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[Gzz-commits] gzz/Documentation/misc/hemppah-progradu mastert...
From: |
Hermanni Hyytiälä |
Subject: |
[Gzz-commits] gzz/Documentation/misc/hemppah-progradu mastert... |
Date: |
Fri, 21 Mar 2003 11:23:02 -0500 |
CVSROOT: /cvsroot/gzz
Module name: gzz
Changes by: Hermanni Hyytiälä <address@hidden> 03/03/21 11:23:01
Modified files:
Documentation/misc/hemppah-progradu: masterthesis.tex
Log message:
More
CVSWeb URLs:
http://savannah.gnu.org/cgi-bin/viewcvs/gzz/gzz/Documentation/misc/hemppah-progradu/masterthesis.tex.diff?tr1=1.172&tr2=1.173&r1=text&r2=text
Patches:
Index: gzz/Documentation/misc/hemppah-progradu/masterthesis.tex
diff -u gzz/Documentation/misc/hemppah-progradu/masterthesis.tex:1.172
gzz/Documentation/misc/hemppah-progradu/masterthesis.tex:1.173
--- gzz/Documentation/misc/hemppah-progradu/masterthesis.tex:1.172 Fri Mar
21 10:32:46 2003
+++ gzz/Documentation/misc/hemppah-progradu/masterthesis.tex Fri Mar 21
11:23:01 2003
@@ -820,27 +820,25 @@
\chapter{Open Problems in Peer-to-Peer}
-In this chapter, we discuss open problems in Peer-to-Peer research. We describe
-the open problems and their proposed solutions. Then, we list all issues in
-tables. Note that the open problems list considered here is not meant
+In this chapter, we discuss open problems in Peer-to-Peer research.
+Note that the open problems list considered here is not meant
to be an exhaustive survey of \emph{all} open problems in Peer-to-Peer domain;
-we focus our attention to security, scalability, usability and performance
issues
-only.
+we focus our attention to some security, scalability, usability and
performance related
+issues only.
\section{Overview}
Partly due to the non-maturity of modern Peer-to-Peer technology, there are
several
-open problems to be solved. The most severe problems are related to
performance, scalability, usability
-and security. Also, many techniques developed for traditional distributed
-systems may no longer apply with Peer-to-Peer systems. Therefore, new
solutions are
-needed to make Peer-to-Peer systems more secure and efficient.
-
-Both the loosely structured and the tightly structured approach have their own
specific problems.
-Since Gnutella \cite{gnutellaurl} was first introduced
-to the public, researchers' main concern has been the scalability problem of
loosely structured
-systems. However, people often misunderstand the scalability problem of the
loosely structured
-approach; \emph{the network overlay} of loosely structured systems is
scalable, but the \emph{data lookup model} is not.
-The main concern of the tightly structured system is to make overlay's data
lookup process
+open problems to be solved. Also, many techniques developed for traditional
distributed
+systems may no longer apply with Peer-to-Peer systems, e.g., load balancing
techiques \cite{byers03dhtbalancing}.
+
+Different problem apply to both the loosely structured and the tightly
structured approach have their own specific problems.
+Since the introduction of Gnutella \cite{gnutellaurl}, the main concern has
been the scalability problem of loosely structured
+systems. However, the scalability problem of the loosely structured is often
misunderstood;
+\emph{the network overlay} of loosely structured systems is scalable, but the
\emph{data lookup model} is not as
+the data lookup process creates lot of extra network traffic (e.g.,
\cite{yang02improvingsearch}).
+
+In tightly structured system the main concern is to make overlay's data lookup
process
more fault tolerant against hostile attacks. Other key problems in tightly
structured
systems are the lack of keyword searches, support for heterogeneous peers and
load balancing
\cite{balakrishanarticle03lookupp2p}.
@@ -861,9 +859,9 @@
currently there are no realizable techniques for this task. Partial solutions
for the Sybil attack is to replicate
and fragment data items randomly among several participating peers. However,
this suggestion assumes that two different
remote entities are actually different; Sybil attacks are still possible and
therefore would need centralized
-authority for reliable authentication. As the author argues in
\cite{douceur02sybil}, without centralized authority,
+authority for reliable authentication. Without centralized authority,
Sybil attacks are always possible in a Peer-to-Peer system except under
extreme and unrealistic assumptions of
-resource parity and coordination among entities.
+resource parity and coordination among entities \cite{douceur02sybil}.
In the Fail-stop attack model, cited in \cite{naor03simpledht}, a faulty peer
is deleted from the Peer-to-Peer system.
The reason for the faultiness of a peer can be a software failure or a hostile
attack.
- [Gzz-commits] gzz/Documentation/misc/hemppah-progradu mastert..., (continued)
- [Gzz-commits] gzz/Documentation/misc/hemppah-progradu mastert..., Hermanni Hyytiälä, 2003/03/20
- [Gzz-commits] gzz/Documentation/misc/hemppah-progradu mastert..., Hermanni Hyytiälä, 2003/03/20
- [Gzz-commits] gzz/Documentation/misc/hemppah-progradu mastert..., Hermanni Hyytiälä, 2003/03/20
- [Gzz-commits] gzz/Documentation/misc/hemppah-progradu mastert..., Hermanni Hyytiälä, 2003/03/20
- [Gzz-commits] gzz/Documentation/misc/hemppah-progradu mastert..., Hermanni Hyytiälä, 2003/03/20
- [Gzz-commits] gzz/Documentation/misc/hemppah-progradu mastert..., Hermanni Hyytiälä, 2003/03/20
- [Gzz-commits] gzz/Documentation/misc/hemppah-progradu mastert..., Hermanni Hyytiälä, 2003/03/21
- [Gzz-commits] gzz/Documentation/misc/hemppah-progradu mastert..., Hermanni Hyytiälä, 2003/03/21
- [Gzz-commits] gzz/Documentation/misc/hemppah-progradu mastert..., Hermanni Hyytiälä, 2003/03/21
- [Gzz-commits] gzz/Documentation/misc/hemppah-progradu mastert..., Hermanni Hyytiälä, 2003/03/21
- [Gzz-commits] gzz/Documentation/misc/hemppah-progradu mastert...,
Hermanni Hyytiälä <=
- [Gzz-commits] gzz/Documentation/misc/hemppah-progradu mastert..., Hermanni Hyytiälä, 2003/03/24
- [Gzz-commits] gzz/Documentation/misc/hemppah-progradu mastert..., Hermanni Hyytiälä, 2003/03/24
- [Gzz-commits] gzz/Documentation/misc/hemppah-progradu mastert..., Hermanni Hyytiälä, 2003/03/24
- [Gzz-commits] gzz/Documentation/misc/hemppah-progradu mastert..., Hermanni Hyytiälä, 2003/03/24
- [Gzz-commits] gzz/Documentation/misc/hemppah-progradu mastert..., Hermanni Hyytiälä, 2003/03/24
- [Gzz-commits] gzz/Documentation/misc/hemppah-progradu mastert..., Hermanni Hyytiälä, 2003/03/24
- [Gzz-commits] gzz/Documentation/misc/hemppah-progradu mastert..., Hermanni Hyytiälä, 2003/03/24
- [Gzz-commits] gzz/Documentation/misc/hemppah-progradu mastert..., Hermanni Hyytiälä, 2003/03/25
- [Gzz-commits] gzz/Documentation/misc/hemppah-progradu mastert..., Hermanni Hyytiälä, 2003/03/25
- [Gzz-commits] gzz/Documentation/misc/hemppah-progradu mastert..., Hermanni Hyytiälä, 2003/03/25