Module Parameters for MariaDB MaxScale 2.4

This page is part of MariaDB's Enterprise Documentation.

The parent of this page is: Reference for MariaDB MaxScale 2.4

Topics on this page:

Overview
MariaDB MaxScale 2.4 Module Parameters
- MariaDB Monitor (mariadbmon)
- Read/Write Split Router (readwritesplit)

Overview

MariaDB MaxScale 2.4 supports many module parameters.

Reference material is available for MariaDB MaxScale 2.4.

MariaDB MaxScale 2.4 Module Parameters

The Module Parameters supported by MariaDB MaxScale 2.4 are listed below.

To see Module Parameters supported in other versions, see "Module Parameters by MariaDB MaxScale Version".

MariaDB Monitor (mariadbmon)

The parameters for mariadbmon:

Parameter	Description
assume_unique_hostnames	Type: bool, default value: true
auto_failover	Type: bool, default value: false
auto_rejoin	Type: bool, default value: false
demotion_sql_file	Type: path
detect_replication_lag	Type: bool, default value: false
detect_stale_master	Require that the Primary Server have connectivity with at least one running Replica Server
detect_stale_slave	Requires that Replica Servers have connectivity with a running Primary Server
detect_standalone_master	Requires that the Primary Server have at least one Replica Server
enforce_read_only_slaves	Type: bool, default value: false
enforce_simple_topology	Type: bool, default value: false
failcount	Number of consecutive times MaxScale can fail to reach the Primary Server before it considers it down
failover_timeout	Type: duration, default value: 90s
handle_events	Type: bool, default value: true
ignore_external_masters	Type: bool, default value: false
maintenance_on_low_disk_space	Type: bool, default value: true
master_failure_timeout	Type: duration, default value: 10s
promotion_sql_file	Type: path
replication_master_ssl	Type: bool, default value: false
replication_password	Type: password string
replication_user	Type: string
servers_no_promotion	Type: serverlist
switchover_on_low_disk_space	Type: bool, default value: false
switchover_timeout	Type: duration, default value: 90s
verify_master_failure	Type: bool, default value: true

Read/Write Split Router (readwritesplit)

The parameters for readwritesplit:

Parameter	Description
causal_reads	Configures read causality, reads subsequent to writes issued in manner to reduce replication lag
causal_reads_timeout	Timeout for synchronization of the Primary Server with a Replica Server during causal reads
connection_keepalive	Type: duration, default value: 300s
delayed_retry	Retry queries that fail to route due to connection issues
delayed_retry_timeout	Timeout for retrying queries that fail to route due to connection issues
disable_sescmd_history	Type: bool, default value: false
lazy_connect	Type: bool, default value: false
master_accept_reads	Route read operations to the Primary Server or whether it only accepts write operations
master_failure_mode	Type: enum, default value: fail_instantly
master_reconnection	Reconnect to the Primary Server if it changes mid-session
max_sescmd_history	Type: count, default value: 50
max_slave_connections	Maximum number of connections the router session can use to connect to Replica Servers
max_slave_replication_lag	Number of seconds a Replica Server is allowed to fall behind the Primary Server
optimistic_trx	Type: bool, default value: false
prune_sescmd_history	Type: bool, default value: false
retry_failed_reads	Type: bool, default value: true
slave_selection_criteria	Criteria the router uses to select Replica Servers in load balancing read operations
strict_multi_stmt	Routes multi-statement queries to the Primary Server
strict_sp_calls	Routes CALL statements to the Primary Server
transaction_replay	Replays in progress transactions that fail on a different Server
transaction_replay_attempts	Maximum number of times to attempt to replay failed transactions
transaction_replay_max_size	Maximum size in bytes permitted for transaction replays
transaction_replay_retry_on_deadlock	Maximum number of times the router attempts to replay transactions in the event that the transaction fails due to deadlocks
use_sql_variables_in	Where the router sends session variable queries