Database / RocksDB Basics Interview Questions
What is the purpose of the Get operation in RocksDB?
Get is the core read operation in RocksDB, used to retrieve the value currently associated with a specific key.
- Checks the active MemTable first, then any immutable MemTables waiting to be flushed, then SSTables from Level 0 downward
- Uses Bloom filters and index blocks along the way to avoid unnecessary reads from files that don't contain the key
- Returns not found if the key doesn't exist, or if its most recent operation was a delete
This read path, checking progressively older layers of data until the key is found or ruled out, is exactly what makes an LSM-tree's write speed possible without sacrificing correctness on reads.
What does Get check first?
What does Get return if a key's most recent operation was a delete?
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