Job Upgrade makes use of Jet state snapshots to address a variety of requirements, including modifications in business logic, bug fixes, and configuration changes.
Easy to Implement
- Job upgrades can be triggered via a Java API or from a command line.
- State snapshots of current jobs are taken and saved.
- New classes or changes are distributed to the Jet nodes.
- New versions are started, and data is read from the saved snapshot.
No Disruption to Customers
- Everything listed above happens in milliseconds, with essentially no latency.
Allows A/B Testing on New Features
- Multiple versions of a Jet Job can run concurrently, writing results to separated sinks.
- After the testing period, pick the better version, and shut down the other.
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