3.3 Processes II
Quiz 6 due 5 PM
Saturday, 12 September 2015
3.4.1 General Server Design Issues
A process serving one client group.
Await request; ensure request is served; repeat.
An iterative server handles request itself.
6. Synchronization I
Quiz 16 due 5 PM
Tuesday, 6 October 2015
Cooperating processes march in lock step, as
they share resources; e.g., printer, mailbox.
Synchronization is paying attention to the
passage of time or orde
4 Communication III
Quiz 7 due 5 PM
Tuesday, 22 September 2015
Email-like message queuing systems may store
messages for several days.
They may transmit those messages, even while
sender and rece
4 Communication IV
Quiz 11 due 5 PM
Thursday, 24 September 2015
Streams and Quality of Service
A streams quality of service requirements amount to:
Required minimum bit rate for data delivery.
Maximum session set up delay b
5 Naming III
Quiz 14 due 5 PM
Thursday, 1 October 2015
5.3.4 Domain Name System
The Internets Domain Name System (DNS) is
the worlds largest distributed naming service.
It accepts human-friendly URLs and returns
the IP addresses that com
5 Naming IV
Quiz 15 due 5 PM
Saturday, 3 October 2015
5.4.3 Decentralized Implementations
Decentralizing attribute naming systems
Mapping (attribute, value) pairs to the desired
Efficiently; i.e., without exhaustive searc
5 Naming II
Quiz 13 due 5 PM
Tuesday, 29 September 2015
5.3 Structured Naming
Flat names work very well for computers.
Simple, structured names are much more
Computers accommodate our weaknesses in
naming our files and I
5. Naming I
Quiz 12 due 5 PM
Saturday, 26 September 2015
What if Romeo had forgotten Juliets name?
Names also are important in distributed
Human-friendly names and dot-domains
dominate the Worldwide Web.
4.2.2 Communication II
Quiz 9 due 5 PM
Saturday, 19 September 2015
Passing Parameters by Value
The IBM PCs and IBM mainframes represent characters
differently; i.e., ASCII and EBCDIC.
Intel and SPARC order data bytes differently; i.e., l
3.4.3 Processes III
Quiz 7 due 5 PM
Tuesday, 15 September 2015
3.4.3 Common Approaches to
Managing Server Clusters
Clients see server clusters as one machine.
Their managers dont
Login to monitor 1 node, install, swap
4. Communication I
Quiz 8 due 5 PM
Thursday, 17 September 2015
Nondistributed systems processes exchange low-level
messages via shared memory.
In general the 7-layer Open Systems Interface (OSI)
network architecture is t
1. Introduction II
Quiz 2 due at 5 PM
Tuesday, 1 September 2015
1.3 Distributed System Types
Intels distributed supercomputer datacenter in
Two of Lockheed Martins airborne
distributed super-computers, high
above Fort Worth, T
1. Introduction I
Quiz 1 due at 5 PM
Saturday, 29 August 2015
Computers were centralized mainframes from
1945 till 1985.
From 1985 to 2015:
1. Microprocessors performance/price x 1013.
2. LANs & WANs: 64Kbps-1Gbps w
3. Processes I
Quiz 5 due 5 PM
Thursday, 10 September 2015
From an operating system or a distributed system point of view,
processes are programs in execution, whose management and
scheduling are crucial.
2. Architectures I
Quiz 3 due 5 PM
Thursday, 3 September 2015
Divide & Conquer organizes the design of a
Name the parts and show their interactions.
System architecture (multi-server?) precedes (drives)
2. Architectures II
Quiz 4 due 5 PM
Tuesday, 8 September 2015
Architectures v. Middleware
Middleware is the singular architectural layer
between applications and distributed platforms
It provides distribution transparency
ENTERPRISE JAVA BEANS
% In this program we will replicate an online shopping cart. We will use the
ArrayList class to hold the items in your shopping cart.
% We will use the CartItem class to represent items in you