socket.recv_buf_size

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='socket.recv_buf_size=212992;gcache.debug=YES;gcs.fc_limit=NO;socket.send_buf_size=NO;evs.keepalive_period=PT3S'

Set Dynamically

Changes made dynamically with SET GLOBAL are not durable and will be lost when the server is stopped. To be durable, changes must be set in the configuration file.

The socket.recv_buf_size option can be set dynamically using the SET GLOBAL command. Setting wsrep_provider_options dynamically does not change the value of other wsrep_provider_options.

To set socket.recv_buf_size dynamically:

SET GLOBAL wsrep_provider_options='socket.recv_buf_size=212992';

To dynamically set multiple options in a single statement:

SET GLOBAL wsrep_provider_options='socket.recv_buf_size=212992;cert.optimistic_pa=NO';