Cc h phn tn

Chng 2

M hnh h phn tn

Ni dung

Gii thiu 1. M hnh vt l 2. M hinh kin trc 3. Cc m hnh c bn

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Gii thiu M hnh

Tru tng ha cc tnh cht, c im ca h phn tn ph hp vi vn c th cn gii quyt

M hnh vt l: Cc thnh phn vt l: my tnh v cc kt ni

M hnh kin trc Cc thnh phn v tng tc gia cc thnh phn

Mt s m hnh c bn Tru tng ha mt s bi ton trong h phn tn M hnh li, m hnh hiu nng, m hnh bo mt

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1. M hnh vt l

I. H phn tn mng II. H phn tn mng cc b III.H phn tn mng Internet IV.H phn tn phc tp: H ca h

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I. H phn tn mng Thit b tnh ton+kt ni mng tc thp Trao i cc thng bo ng dng vn bn=>

Email, News, FTP, Ch quan tm n vic truyn thnh cng/khng

thnh cng Cha quan tm n nhanh, chm tng tc,

khng tng tc=>cht lng dch v Cha quan tm n tnh m, khng ng nht

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II. H phn tn mng cc b

Trao i thng tin tc cao bng mng cc b

Chia s tp, cc ng dng Intranet Phm vi hp (10-100-1000 nt) Ni chung ng nht, khc nhau trong khun

kh h tr ca nh cung cp h thng c yu cu v cht lng dch v, nhng

cha t ra yu cu gii quyt

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III. H phn tn trn mng Internet

Mng trn mng S lng nt ln Khng ng nht (my tnh, kt ni)=> chun ha Cc ng dng phong ph Vn v cht lng dch v c t ra cho

kt ni im cui->im cui Bi ton m bo cht lng dch v Chun ha gii quyt vn khng ng nht

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IV. H phn tn phc tp

H ca cc h Trao i gia cc h dch v, giao din gia cc h Tch hp cc h thng phn tn K thut Qun l

Cc vn trong mt khng gian mi: M, khng ng nht, cht lng dch v

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So snh cc m hnh vt l n gin Da trn mng

cc b Da trn Internet

H thng ca cc h thng

Qui m Nh (

2. M hnh kin trc

I. Cc thnh phn kin trc II. Cc m hnh kin trc ph bin III.Cc phn mm trung gian tng ng

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I. Cc thnh phn kin trc

Thc th M thc trao i thng tin Cch thc phn phi chc nng nhim v

(Role Distribution) Cch thc trin khai v ci t chc nng

nhim v (Function Deployment)

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Thc th trao i thng tin

Host (d liu cc b+code cc b, 1/1) Tin trnh (d liu cc b+code cc b)

(lung) i tng (d liu+code) Thnh phn (d liu+code+mi trng) Web services (d liu+code=dch v)

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Cc m thc trao i thng tin

IPC (socket: TCP, UDP, Socket), Request Reply Protocol

RPC, RMI Trao i thng tin gin tip

Trao i thng tin nhm M hnh thu bao-xut bn Hng i thng bo Khng gian d liu theo cu trc B nh chia s dng chung

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Phn cng chc nng

Client-Server Client: Uses service Server: Provides service Multi tiered

P2P Hybrid

Some service follows CS model Some service follows P2P model

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Phn cng chc nng

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Server

Client

Client

invocation

result

Serverinvocation

result

Process:Key:

Computer:

Phn cng chc nng

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Phn phi cc chc nng trn h tng

Phn ti: dch v trn nhiu server Sao lu (m) Mobile code Mobile agent

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Mobile code

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a) client request results in the downloading of applet code

Web server

ClientWeb serverApplet

Applet codeClient

b) client interacts with the applet

3. Cc loi kin trc thng dng trong h phn tn Kin trc phn tng Kin trc hng i tng Kin trc hng d liu Kin trc hng s kin

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I. Kin trc phn tng Chc nng trn h thng c phn r thnh cc chc nng

con

Cc chc nng con c thc hin bi cc m un phn mm cc thc th phn mm trn cc h thng khc nhau tng tc vi nhau

Cc m un phn mm khc nhau trn cng h thng phi hp v tng tc vi nhau thc hin chc nng chung

n gin h thng cn gim thiu lin kt gia cc m un: kin trc phn tng

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Kin trc phn tng

Tng N Thc th Giao thc ( 4 loi giao thc) Dch v im truy cp dch v

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Kin trc phn tng

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Applications, services

Computer and network hardware

Platform

Operating system

Middleware

Phn tng theo TCP-IP

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M hnh ISO/OSI

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26 Instructors Guide for Coulouris, Dollimore, Kindberg and Blair, Distributed Systems: Concepts and Design Edn. 5 Pearson Education 2012

Kin trc phn lp

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III. Kin trc hng i tng -Thnh phn i tng - Connector Li gi phng thc - Object Client v Object server -Kt ni lng gia cc i tng -V d: Corba

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IV. Kin trc hng s kin -Thnh phn h thng trao i thng tin vi nhau thng qua cc s kin -Cc s kin cha cc thng tin cn trao i -Cc s kin c th kch hot cc thao tc trong cc tin trnh -C th thc hin theo m hnh im im hoc m hnh trc qung b s kin -V d

-m hnh thu bao/xut bn -Lin kt lng

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V. Kin trc hng d liu

Kin trc hng d liu

- Cc thnh phn trao i thng tin thng qua kho d liu chung

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M hnh

Kt qu ca s tru tng ha h phn tn Tp trung vo mt phng din, mt kha cnh

ca h phn tn M hnh li

Cc dng li T sut li

M hnh hiu nng M hnh bo mt

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Cc yu t cn quan tm trong kin trc client server

Tng tc hng kt ni/khng hng kt ni Giao thc c nh/khng nh Yu cu c tnh cht bn vng/khng bn vng

(idempotent) Vn im truy cp dch v

S dng dch v DNS S dng dch v cc b

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II. Phn tng ng dng

Cc mc phn tng Giao din Nghip v D liu

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I. Kin trc client-server -Client:

-gi yu cu, nhn kt qu, hin th cho NSD

-Server: -lng nghe, nhn yu cu, x l, tr li

-Tng tc gia client v server c th l hng kt ni hoc khng hng kt ni -Vn

-ng k server (DNS hoc dch v th mc) -C th lp li yu cu? (idempotent) -C b nh trng thi?

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Kin trc nhiu bn

Coi h thng l tp hp cc thnh phn vi quan h client server khng to vng lp

Cy c chiu su 1: M hnh client server Cy c chiu su >1 m hnh a tng V d

Client: trnh duyt Server: Webserver Application server DB server

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Phn tng ng dng tm kim

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Cc m hnh 2 bn

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Server-Client

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Cc m hnh client-server ci tin

H thng phn tng chiu ng, theo chc nng H thng phn tng theo chiu ngang (theo ti)

Proxy, cc c ch phn ti M di ng (applet, javascipt) Mobile agent Network computer Thin client

Mobile client Kt ni, nhn bit bi cnh, tng tranh, ..

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3. Cc m hnh c bn

Tru tng ha cc tnh cht ca h thng Tng tc S c An ton

3 loi m hnh M hnh tng tc M hnh li M hnh bo mt

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M hnh tng tc Nhiu server tng tc nhiu client Nhiu client-server tng tc vi nhau Tham kho

M hnh thc hin ca mt gii thut phn tn M hnh tin trnh M hnh knh

tr, tr truy cp, tr phn mm Bng thng

M hnh c h thng ng h ca cc tin trnh, ca c h thng Tham kho slide phn gii thut

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M hnh li

Loi li cho tin trnh b qua, b qua gi, b qua nhn,dng,

ngu nhin, Li cho knh truyn

B qua, ngu nhin

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M hnh bo mt

Nghe trm, gi mo, replay M ha, xc thc, knh tin cy

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