Cloudware Basics - Guide to Cloud Computing for Business and Technology Managers - page 279

the right libraries, using the Berkeley lab checkpoint/restart library. It can
also invoke application-specific code (which may send out a message to the
users or write something in a log file, etc.) during checkpointing and restart.
13.6.3.2.2 Transactional Paradigm
When an application instance fails, some signal (e.g., closing of network con-
nections) is sent to the other instances, which abort all work in progress for
the failed instance. When the failed instance restarts, it restarts all trans-
actions in progress. Additionally, other instances restart any requests they
made to the failed instance.
13.7 Summary
This chapter introduced the concept of cloud computing. It describes its
definition, presents the cloud delivery and deployment models, and high-
lights its benefits for enterprises. In the last part of the chapter, we discussed
the primary challenges faced while provisioning of cloud services, namely,
scalability, multitenancy, and availability. This prepares the background for
understanding the economics of cloud computing solutions, which we take
up in the next chapter.