evs.delayed_keep_period

This page is part of MariaDB's Documentation.

The parent of this page is: wsrep Provider Options for MariaDB Enterprise Server

Overview

Defines how long the node requires a delayed node to remain responsive before it removes an entry from the delayed list

The wsrep_provider_options system variable applies to MariaDB Enterprise Cluster, powered by Galera and to Galera Cluster available with MariaDB Community Server. This page relates specifically to the evs.delayed_keep_period wsrep_provider_options.

USAGE

DETAILS

Each cluster node monitors the group communication response times from all other nodes. When the cluster registers a delayed response from a given node, it adds an entry for that node to its delayed list. Nodes that remain on the delayed list can trigger Auto Eviction, which removes them permanently from the cluster.

The evs.delayed_keep_period option determines how long a node on the delayed list must remain responsive before it removes one entry. The number of entries on the delayed list and how long it takes before the node removes all entries depends on how long the delayed node was unresponsive.

Attribute	Value
Option Name	evs.delayed_keep_period
Default Value	`PT30S` (Period of Time 30 Seconds)
Minimum Value	PT0S
Maximum Value	PT30S
Dynamic	NO
Debug	`NO`

SYNONYMS

SCHEMA

PARAMETERS

SKYSQL

PRIVILEGES

EXAMPLES

Display Current Value

wsrep_provider_options define optional settings the node passes to the wsrep provider.

To display current wsrep_provider_options values:

SHOW GLOBAL VARIABLES LIKE 'wsrep_provider_options';

The expected output will display the option and the value. Options with no default value, for example SSL options, will not be displayed in the output.

Set in Configuration File

When changing a setting for a wsrep_provider_options in the config file, you must list EVERY option that is to have a value other than the default value. Options that are not explicitly listed are reset to the default value.

Options are set in the my.cnf configuration file. Use the ; delimiter to set multiple options.

The configuration file must be updated on each node. A restart to each node is needed for changes to take effect.

Use a quoted string that includes every option where you want to override the default value. Options that are not in the list will reset to their default value.

To set the option in the configuration file:

wsrep_provider_options='evs.delayed_keep_period=PT20S;gcache.debug=YES;gcs.fc_limit=NO;socket.send_buf_size=NO;evs.keepalive_period=PT3S'

wsrep_provider_options="evs.delayed_keep_period=PT32S"

Set Dynamically

The evs.delayed_keep_period option cannot be set dynamically. It can only be set in the configuration file.

Trying to change a non-dynamic option with SET results in an error:

ERROR 1210 (HY000): Incorrect arguments to SET

Minimum Value

The minimum value for evs.delayed_keep_period is PT0S.

Maximum Value

The maximum value for evs.delayed_keep_period is PT30S.

ERROR HANDLING

FEATURE INTERACTION

RESPONSES

DIAGNOSIS

ISO 9075:2016

CHANGE HISTORY

Release Series	History
10.6 Enterprise	Present starting in MariaDB Enterprise Server 10.6.4-1.
10.6 Community	Present starting in MariaDB Community Server 10.6.0.
10.5 Enterprise	Present starting in MariaDB Enterprise Server 10.5.3-1.
10.5 Community	Present starting in MariaDB Community Server 10.5.0.
10.4 Enterprise	Present starting in MariaDB Enterprise Server 10.4.6-1.
10.4 Community	Present starting in MariaDB Community Server 10.4.0.
10.3 Enterprise	Present starting in MariaDB Enterprise Server 10.3.16-1.
10.3 Community	Present starting in MariaDB Community Server 10.3.0.
10.2 Enterprise	Present starting in MariaDB Enterprise Server 10.2.25-1.
10.2 Community	Present starting in MariaDB Community Server 10.2.0.