[UIMA-5193] DUCC failover support (static)

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.2.0-Ducc
• Component/s: DUCC
• Assignee: Lou DeGenaro
• Reporter: Lou DeGenaro
• Created: 28/Nov/16 19:43
• Updated: 05/Jan/17 18:25
• Resolved: 05/Jan/17 18:25

Description

DUCC should provide the capability to move the head node, comprising the broker, database, Orchestrator, PM, RM, SM, and WS, and have the agents seamlessly switch over w/o service disruption.
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In this "static" failover implementation the agents are pre-configured with a list of potential head nodes. Introduced into the ducc.properties file is the key ducc.head.failover whose value is a comma separated list of failover nodes:

ducc.head.failover = node1, node2, node3...

The agents at boot time are configured for broker failover to this set of nodes.

If ducc.head.failover is not specified, then the failover functionality is simply not supported for the installation (e.g. no seamless transition of running agents to an alternate broker head node).

If ducc.head.failover is specified, then the node specified for ducc.head must appear in this list.