Andrzej Bialecki created SOLR-11726:
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Summary: Analyze and verify dynamic behavior of the autoscaling
framework
Key: SOLR-11726
URL: https://issues.apache.org/jira/browse/SOLR-11726
Project: Solr
Issue Type: Task
Security Level: Public (Default Security Level. Issues are Public)
Components: AutoScaling
Reporter: Andrzej Bialecki
Currently most unit and integration tests verify the static behavior of
autoscaling, ie. they introduce a change and then wait until the state of the
system stabilizes, and then make assertions.
While this testing is necessary it doesn't address the issues related to
transient responses of the framework to changes in time. It's also important to
learn the timescale of the framework's reactions to such events, and its
behavior when faced with overlapping / conflicting events.
One simple example that illustrates the need for this kind of testing is a
scenario with a flaky node that periodically comes down and up again. Depending
on the frequency of changes and the trigger configuration (eg. {{waitFor}}
value) the current implementation of the framework may lead at best to high
churn (as replicas are being moved around) or even to data loss (by moving
replicas to a flaky node).
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