Quality attributes of Web software applications Page 1 focusengineering Internet software
0740-7459/02/$17.00 © 2002 IEEE March/April 2002 IEEE SOFTWARE 2 5 systems. The …

Many important applications must run continuously and without interruption, yet must be
changed to fix bugs or upgrade functionality. No prior general-purpose methodology for …

Many important applications must run continuously and without interruption, and yet also
must be changed to fix bugs or upgrade functionality. No prior general-purpose …

The usual way of installing a new version of a software system is to shut down the running
program and then install the new version. This necessitates a sometimes unacceptable …

Despite decades of research in extensible operating system technology, extensions such as
device drivers remain a significant cause of system failures. In Windows XP, for example …

Modern software must evolve in response to changing conditions. In the most widely used
programming environments, code is static and cannot change at runtime. This poses …

Maintenance is the dominant source of downtime at high availability sites. Unfortunately, the
dominant mechanism for reducing this downtime, cluster rolling upgrade, has two …

Dynamic update is a mechanism that allows software updates and patches to be applied to
a running system without loss of service or down-time. Operating systems would benefit from …

During maintenance, systems are updated to correct faults, improve functionality, and adapt
the software to changes in its execution environment. The typical software update process …

Memory corruption attacks are a pre-dominant attack vector against IoT devices. Simply
updating vulnerable IoT software is not always possible due to unacceptable downtime and …