Module solana_runtime::accounts_db[−][src]

Expand description

Persistent accounts are stored in below path location: //data/

The persistent store would allow for this mode of operation:

Concurrent single thread append with many concurrent readers.

The underlying memory is memory mapped to a file. The accounts would be stored across multiple files and the mappings of file and offset of a particular account would be stored in a shared index. This will allow for concurrent commits without blocking reads, which will sequentially write to memory, ssd or disk, and should be as fast as the hardware allow for. The only required in memory data structure with a write lock is the index, which should be fast to update.

AppendVec’s only store accounts for single slots. To bootstrap the index from a persistent store of AppendVec’s, the entries include a “write_version”. A single global atomic AccountsDb::write_version tracks the number of commits to the entire data store. So the latest commit for each slot entry would be indexed.