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Answer: Delta Lake’s OCC detects conflicts by checking the version of the data each transaction is working on. If a conflict is detected, the transaction is rolled back and retried.
Delta Lake’s OCC mechanism detects conflicts by comparing the versions of the data that each transaction is attempting to modify. If a conflict is detected, typically during the commit phase, Delta Lake will roll back the conflicting transaction and allow it to be retried. This approach ensures that data integrity is maintained while allowing for high concurrency in write operations.
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Describe the process of handling conflicts in Delta Lake when multiple users are performing write operations concurrently. Explain how Delta Lake’s Optimistic Concurrency Control detects these conflicts and the steps it takes to resolve them.
A
Delta Lake uses pessimistic locking to prevent conflicts, ensuring that only one user can perform write operations at a time.
B
Delta Lake’s OCC allows multiple write operations to proceed simultaneously without checking for conflicts, leading to data corruption.
C
Delta Lake’s OCC detects conflicts by checking the version of the data each transaction is working on. If a conflict is detected, the transaction is rolled back and retried.
D
Delta Lake does not handle conflicts; it relies on the cloud storage layer to manage concurrent writes.
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