CommunityNews

CommunityNews

Disks Lie: Building a WAL that actually survives

A write-ahead log (WAL) is one of those database concepts that sounds deceptively simple. You write a record to disk before applying it to your in-memory state. If you crash, you replay the log and recover. Done.

Except your disk is lying to you.

PostgreSQL, SQLite, RocksDB, Cassandra… every production

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