Library Version 18.1.40

Replication Manager Preferred Master Mode
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## Replication Manager Preferred Master Mode

Replication Manager now supports preferred master mode for two-site replication groups. In preferred master mode, one site is the preferred master site, which operates as the master as much of the time as its availability permits. The other site is the client site, which takes over temporarily as master when the preferred master site is unavailable.

### New Parameter Values

- DB_REPMGR_CONF_PREFMAS_MASTER — A new `which` parameter value for the DB_ENV->rep_set_config() method to indicate that this site is the preferred master site.
- DB_REPMGR_CONF_PREFMAS_CLIENT — A new `which` parameter value for the DB_ENV->rep_set_config() method to indicate that this site is the client site in a preferred master replication group.

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