6.11.2. Connector Automatic Reconnect

Automatic reconnect enables the Connector to re-establish a connection in the event of a transient failure. Under specific circumstances, the Connector will also retry the query.

  1. Connector automatic reconnect is enabled by default in Proxy and Smartscale modes. Use the tpm command option --connector-autoreconnect=false to disable automatic reconnect.

  2. This feature is not available while running in Bridge Mode. Use the tpm command option --connector-bridge-mode=false to disable Bridge mode.

  3. Automatic reconnect enables retries of statements under the following circumstances:

    • not in bridge mode

    • not inside a transaction

    • no temp table has been created

    • no lock acquired and not released

    • the request is a read

To disable:

Show Staging

Show INI

shell> tpm query staging
tungsten@db1:/opt/continuent/software/tungsten-clustering-6.0.5-41

shell> echo The staging USER is `tpm query staging| cut -d: -f1 | cut -d@ -f1`
The staging USER is tungsten

shell> echo The staging HOST is `tpm query staging| cut -d: -f1 | cut -d@ -f2`
The staging HOST is db1

shell> echo The staging DIRECTORY is `tpm query staging| cut -d: -f2`
The staging DIRECTORY is /opt/continuent/software/tungsten-clustering-6.0.5-41

shell> ssh {STAGING_USER}@{STAGING_HOST}
shell> cd {STAGING_DIRECTORY}
shell> ./tools/tpm configure alpha \
    --connector-autoreconnect=false

Run the tpm command to update the software with the Staging-based configuration:

shell> ./tools/tpm update

For information about making updates when using a Staging-method deployment, please see Section 9.3.7, “Configuration Changes from a Staging Directory”.

shell> vi /etc/tungsten/tungsten.ini
[alpha]
...
connector-autoreconnect=false

Run the tpm command to update the software with the INI-based configuration:

shell> tpm query staging
tungsten@db1:/opt/continuent/software/tungsten-clustering-6.0.5-41

shell> echo The staging DIRECTORY is `tpm query staging| cut -d: -f2`
The staging DIRECTORY is /opt/continuent/software/tungsten-clustering-6.0.5-41

shell> cd {STAGING_DIRECTORY}

shell> ./tools/tpm update

For information about making updates when using an INI file, please see Section 9.4.4, “Configuration Changes with an INI file”.

Configuration group alpha

The description of each of the options is shown below; click the icon to hide this detail:

Click the icon to show a detailed description of each argument.

The autoreconnect status can be monitored within the autoReconnect parameter output by the tungsten show variables while connected to the Connector. For example:

shell> tpm connector
mysql> tungsten show variables like "autoReconnect";
+----------------------+---------------+-------+
| Variable_Type        | Variable_name | Value |
+----------------------+---------------+-------+
| connector.properties | autoReconnect | false  |
+----------------------+---------------+-------+
1 row in set (0.00 sec)

The above output indicates that the autoreconnect feature is disabled. The tungsten show command is not available in Bridge mode.