More than two decades of knowing better should translate to tools and statistics for Web services.
We speak routinely of software crashing, but we dont give those
events nearly the level of scrutiny that we give to real-world crashes.
An airplane crash triggers a painstaking investigation.
When software fails, the user is told to
hope that it works the next time. Is this any way to run an airline?
This jarring difference in "crash" response has mostly been ignored.
I do remember a comment, late in the 1980s, by one advocate of advanced
software development environments: He compared C and C++ developers trying to diagnose a software failure to arson investigators roaming through the charred and smoking debris in search of a recognizable fragment of the match. Even at that time,
there were superior counterexamples such as the Lisp
but relentless price pressures in the workstation market,
not to mention the growing capability of PCs, drove developers down a
path of false economy toward lower-cost tools that did much
One gallows humorist at Microsoft actually named
a tool CRASH
for Comparative Reliability Analysis of Software and Hardwareand
promised developers, among other things, the ability to calculate "a
final score other than pass or fail." Frankly, I dont understand that
proposition at all: It seems to me that software either meets its
specification, including a level of reliability sufficient to the
intended task, or it does not.
Whats between "pass" and "fail"? Would you ship a product rated
Perhaps its reasonable, though, to take a different view of
mass-market software, with consumers already having some intuitive
understanding of the "get what you pay for" difference between, for example, a
Toyota and a Lexus. Even so, from what I can see, it appears that the
real difference is not that a Lexus is more reliable, but rather that with
the Lexus, youve paid in advance for a higher level of hand-holding
when something does go wrong. Thanks, but Ill keep driving my
apparently crash-proof Sienna, and Ill keep choosing software thats
reliable over software that offers extra bells and whistles.
In the realm of software, the move to a service-based architecture
offers developers a more granular opportunity to vote for their own
preferred trade-off between doing more and failing less. Improved tools
are emerging for developers. Late last week, for example, I saw the
most recent version of Mindreefs
and found the newly released Version 4 update making
important improvements to support developers throughout a Web services
In the long run, a UDDI (Universal Description, Discovery and Integration) repository may offer a Web service aggregator several choices of
services that meet an applications needs. One has to wonder if
repository metadata will soon include statistically based ratings of
service availability, accuracy and other metrics of performance
history for that particular Web service offering. If Consumer Reports
can gather and publish reliability histories for automobiles, will
someone build testbed applications that invoke various common Web
services from different providers and systematically record their
Its getting cheaper to gather data, in this as in every other
realm. The IEEE, for example, announced last week its first standard
for automobile "black box" recorders
to give post-crash data to
accident investigators, such as that available following aircraft
Web services should enjoy no less.
Tell me what you want to know after the crash at firstname.lastname@example.org.
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