Understanding Raft WAL Logs

[mrjn (Manish R Jain)]

Yeah, we don’t need cache because we need to read the logs rarely. I’ll summarize the discussion we had now.

Predicate Moves using RAFT

Predicate moves Every predicate would be part of a 3-node cluster. When mutation arrives, it would be directed to the master of the cluster. The master would append the mutation to it’s write-ahead log (and synced to disk in parallel with the network calls coming next). It would then send this mutation off to it’s followers, and once they confirm, the mutation would be applied to Posting List. Periodically, we need to delete older logs, to keep their size in check. To do this, we’ll run this al…