Duplicating Tomcat and the TAC web application

Procedure

Duplicate this Tomcat instance on different servers, as many times as needed.

Information noteWarning: Having different Talend Administration Center Tomcat servers on the same OS instance are not supported when configuring high availability.

Information noteWarning: Make sure that system clocks of databases and servers are synchronized (the clocks must be within a second of each other). For more information on time-sync services, refer to the Microsoft documentation about SNTP, Windows Time Service tools, and Network Clocks.
Duplicate the org.talend.administrator Web application to all Tomcat instances. Make sure that all Web application configurations are identical.
For each Tomcat instance, open configuration.properties file in the <TalendAdministrationCenterInstallationDirectory>/apache-tomcat/webapps/org.talend.administrator/WEB-INF/classes folder and set the value of node.identifier= parameter.

Information noteWarning: Check that each Tomcat instance (or node) has a unique identifier in the cluster.
Launch one Tomcat instance following the commands given in Deploying Talend Administration Center on Apache Tomcat.
Launch the other instances of Tomcat following the same procedure.

Results

Fail-over will occur when one of the multiple execution servers fails while in the midst of executing one or more tasks. When a server fails, the other servers of the cluster detect the condition and identify the tasks in the database that were in progress within the failed server. Any tasks marked for recovery will be taken over by another server.

Note that the ranking of servers to be used for load balancing is based on indicators, whose bounds (such as free disk space limits) and weight are defined in the file: monitoring_client.properties which is located in <ApplicationPath>\WEB-INF\lib\org.talend.monitoring.client-A.B.C.jar. These values can be edited according to your needs. For more information, see Configuring the indicators which determine which server to be used for load balancing.

Important: One known minor issue related to the DST change might prevent the failover to operate correctly. To work around this issue, restart Tomcat after the time change. This should have no impact on executions.

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