Database / RocksDB Basics Interview Questions
What is an Immutable MemTable?
An Immutable MemTable is a MemTable that has reached its size limit and stopped accepting new writes, but hasn't yet been flushed to disk as an SSTable.
- Created the moment an active MemTable fills up, at which point a brand new, empty MemTable takes over for future writes
- Still readable, so Get calls and iterators continue to check it until it's flushed
- Removed once a background thread finishes flushing its contents to a new Level-0 SSTable
This intermediate state is what lets RocksDB keep accepting new writes into a fresh MemTable without pausing to wait for the previous one to finish being written to disk.
Can an Immutable MemTable accept new writes?
Is an Immutable MemTable still readable by Get calls?
More Related questions...
