Bloomberg LP Interview Question for Software Engineer / Developers

Team: Supply Chain
Country: United States
Interview Type: In-Person

Comment hidden because of low score. Click to expand.
of 3 vote

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.

Pessimistic 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.

- Algorithmy December 06, 2014 | Flag Reply
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of 0 vote

If database returns rows to the processes in same order then
Pth process processes row with index i if i%N=P and skips everything else

- Guest December 14, 2014 | Flag Reply
Comment hidden because of low score. Click to expand.
of 0 vote

Optimistic Locking assumes that the commits are frequent. However, no such information is provided here. Hence, it may not be used.

A simple solution is to create a new queue for the row whenever more than one process tries to access the row.

- Rajat Pawar January 20, 2015 | Flag Reply

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