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All three classes of recovery techniques ensure that Odysseus continues the data stream processing after a restart, but they differ in their completeness and correctness guarantees. To achieve completeness and correctness respectively correctness, the rollback and the precise recovery need additional plug-ins: an external application, Backup of Data Streams (BaDaSt), and Checkpointing.
Additionally, there are other recovery techniques available with completeness and correctness guarantees between the three mentioned classes: