December 2017
Intermediate to advanced
468 pages
13h 12m
English
book
Architectural Patterns
by Anupama Murali, Pethuru Raj, Harihara Subramanian J, Pethuru Raj Chelliah
Content preview from Architectural Patterns
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Event log
There needs to be a backup and recovery mechanism for the messages that are added to the central event queue. This is done by writing all the event details to an event log, which is typically placed in a disk. In the event of a system crash, the system's state can be rebuilt by recovering its state from the event log. So, the main purpose of an event log is to ensure that events persist. In order to make the backup mechanism stronger, backups of the event log can be taken, which is equivalent to taking a backup of the system's state. These backup copies can also be used to do pilot performance tests on new releases before they are actually deployed in production. The diagram of the event log is as follows:
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