Hoss Man created SOLR-13118:
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Summary: Redesign integration tests for nodeAdded/nodeLost trigger
state restoration
Key: SOLR-13118
URL: https://issues.apache.org/jira/browse/SOLR-13118
Project: Solr
Issue Type: Sub-task
Security Level: Public (Default Security Level. Issues are Public)
Reporter: Hoss Man
The (integration) tests related to autoscaling nodeAdd/nodeLost trigger's and
restoring their state are problematic for a lot of reasons.
Beyond some silly implementation mistakes, a fundemental timing/concurrency
issue is that (as designed) the tests have no way to ensure that "after"
creating a nodeAdded/nodeLost situation, they can wait for the (first instance
of) the trigger to run() and detect the situation (recording it in the
trigger's internal state) so that the test can subsequently "update" the
trigger, forcing a new instance to restore the old state and then execute the
trigger actions. This can result i na lot of flaky-ness if the triggers don't
run when "expected"
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