Module switchover_buffer 

Switchover Buffer - Query buffering during controlled switchover

Buffers write queries during the brief switchover window to ensure zero transaction loss. Queries are replayed to the new primary once switchover completes.

How it works

Normal Operation:
  Client → Proxy → Primary

During Switchover:
  Client → Proxy → Buffer (queued)
                     ↓
  [Switchover completes]
                     ↓
           Buffer → New Primary (replayed)

Timeout Behavior

If switchover takes longer than buffer_timeout, buffered queries will fail with a timeout error rather than blocking indefinitely.

Structs

BufferConfig

Buffer configuration

BufferStatsSnapshot

Statistics snapshot

BufferedQuery

A buffered query waiting to be executed

SwitchoverBuffer

Switchover buffer for zero-downtime primary transitions

Enums

BufferResult

Result of a buffered query after replay

BufferState

Buffer state