[jira] [Updated] (SOLR-10602) Triggers should be able to restore state from old instances when taking over

["Shalin Shekhar Mangar (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-10602?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Shalin Shekhar Mangar updated SOLR-10602:
-----------------------------------------
    Attachment: SOLR-10602.patch

* Added a new restoreState(Trigger) method in Trigger interface
* Added tests for node added and node lost triggers
* ScheduledTriggers calls this new method before replacing scheduling the new trigger

This still needs an integration test.

> Triggers should be able to restore state from old instances when taking over
> ----------------------------------------------------------------------------
>
>                 Key: SOLR-10602
>                 URL: https://issues.apache.org/jira/browse/SOLR-10602
>             Project: Solr
>          Issue Type: Sub-task
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: SolrCloud
>            Reporter: Shalin Shekhar Mangar
>            Assignee: Shalin Shekhar Mangar
>              Labels: autoscaling
>             Fix For: master (7.0)
>
>         Attachments: SOLR-10602.patch
>
>
> Currently if a user modifies a trigger then the old trigger is closed and unscheduled and replaced with a new trigger instance with updated properties. However, this loses the intermediate state that the trigger may have been tracking. For example, say there is a trigger for NodeAdded event with waitFor=5s and a new node is added to the cluster. While the trigger is waiting for 5s before firing, the user modifies the trigger to change the waitFor=2s. Doing this today will erase the state of the old trigger and the new trigger will never fire for the newly added node.
> We need to be able to restore state from old trigger instance before replacing it.



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