[SOLR-10340] Implement set-listener and remove-listener API

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 7.1, 8.0
• Component/s: SolrCloud
• Labels: autoscaling
• Assignee: Shalin Shekhar Mangar
• Reporter: Shalin Shekhar Mangar
• Created: 22/Mar/17 13:33
• Updated: 17/Oct/17 11:03
• Resolved: 24/Mar/17 08:41

Description

Implement set-listener and remove-listener API to listen to various lifecycle stages of a trigger.

The set-listeners API can be invoked to add a listener to any trigger at any stage of its execution. The parameters are :

• ‘name’ - a unique string identifying the listener so that it can be read, updated and removed
• ‘trigger’ - the name of the trigger to listen to
• ‘stage’ - the stage of the trigger (multiple values can be specified as an array of strings), possible values are:
  • STARTED,
  • ABORTED,
  • FAILED,
  • SUCCEEDED
• ‘beforeAction’ - the action name before which the listener should be notified. Multiple values can be specified as an array of strings.
• ‘afterAction’ - the action name after which the listener should be notified. Multiple values can be specified as an array of strings
• ‘class’ - an implementation of ‘TriggerListener’ class
• Other parameters depend on the listener class

An example invocation of this API is:

curl -H 'Content-type:application/json' -d '{
    “set-listener” : 
		{
			“name” : “xyz”,
			“trigger” : “node_lost_trigger”,
			“stage” : [“STARTED”,”ABORTED”,”SUCCEEDED”],
			“beforeAction” : “execute_plan”,
			“class” : “solr.HttpCallback”,
			“url” : “http://xyz.com/on_node_lost?node={$LOST_NODE_NAME}”	
}' http://localhost:8983/solr/admin/cluster