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From "Lou DeGenaro (JIRA)" <...@uima.apache.org>
Subject [jira] [Created] (UIMA-5193) DUCC failover support (static)
Date Mon, 28 Nov 2016 19:43:58 GMT
Lou DeGenaro created UIMA-5193:
----------------------------------

             Summary: DUCC failover support (static)
                 Key: UIMA-5193
                 URL: https://issues.apache.org/jira/browse/UIMA-5193
             Project: UIMA
          Issue Type: Improvement
          Components: DUCC
            Reporter: Lou DeGenaro
            Assignee: Lou DeGenaro
             Fix For: 2.2.0-Ducc


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.
---
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.





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