https://nalar.dev/tags/replication/ Recent content in Replication on Nalar Hugo en-us Tue, 15 Sep 2026 00:00:00 +0700 https://nalar.dev/tombstones-preserve-deletions-across-replica-gaps/ Tue, 15 Sep 2026 00:00:00 +0700 https://nalar.dev/tombstones-preserve-deletions-across-replica-gaps/ <p>A replicated store cannot always represent deletion as immediate absence. If one replica removes a record while another replica is disconnected, erasing every trace of the record also erases the evidence needed to distinguish a deliberate deletion from a replica that simply has not seen recent state.</p> <p>A tombstone keeps that evidence as versioned metadata. Instead of removing the key from the replication domain at once, the system records a deletion marker that participates in reconciliation. A replica carrying an older live value can then compare its state with the marker and discard the obsolete value.</p>