Compability

Requirements

  • JRE 11 or above
  • mysql 5.1, 5.5, 5.6, 5.7, 8
  • kafka 0.8.2 or greater (if using kafka)

Caveats / Notes

binlog_row_image=MINIMAL

Maxwell supports binlog_row_image=MINIMAL, but it may not be what you want. It will differ from normal Maxwell operation in that:

  • INSERT statements will no longer output a column's default value
  • UPDATE statements will be incomplete; Maxwell outputs as much of the row as given in the binlogs, but data will only include what is needed to perform the update (generally, id columns and changed columns). The old section may or may not be included, depending on the nature of the update.
  • DELETE statements will be incomplete; generally they will only include the primary key.

Master recovery

Maxwell includes support for master position recovery (non-GTID). It works like this:

  • maxwell writes heartbeats into the binlogs (via the positions table)
  • maxwell reads its own heartbeats, using them as a secondary position guide
  • if maxwell boots and can't find its position matching the server_id it's connecting to, it will look for a row in maxwell.positions from a different server_id.
  • if it finds that row, it will scan backwards in the binary logs of the new master until it finds that heartbeat.

Notes:

  • master recovery is not compatible with separate schema-store hosts and replication-hosts, due to the heartbeat mechanism.
  • this code should be considered alpha-quality.
  • on highly active servers, as much as 1 second of data may be duplicated.
  • master recovery is not available in GTID-mode.
  • GTID is generally a preferred method of master failover.