Bloomberg LP Interview Question
Software Engineer / DevelopersTeam: Supply Chain
Country: United States
Interview Type: In-Person
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Optimistic locking - We make a note of the record was read using the version number (or, other data such as time stamp, etc). When the record is written back we update the record if there are not changes in the version number. If the record is dirty, we fail the update transaction and ask the process to retry again. We also have to careful to make sure that the updates are atomic so as to not result in toctou software bug. This approach is usually used in high volume web based system that might use a stateless protocol like http.
- Algorithmy December 06, 2014Pessimistic locking - We lock the record at the time of reading. No other process can update the record until the lock is released. Once the record is done, transaction is closed and record is updated.