Andrzej Bialecki created SOLR-11833:
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Summary: Allow searchRate trigger to delete replicas
Key: SOLR-11833
URL: https://issues.apache.org/jira/browse/SOLR-11833
Project: Solr
Issue Type: Sub-task
Security Level: Public (Default Security Level. Issues are Public)
Components: AutoScaling
Reporter: Andrzej Bialecki
Assignee: Andrzej Bialecki
Currently {{SearchRateTrigger}} generates events when search rate thresholds
are exceeded, and {{ComputePlanAction}} computes ADDREPLICA actions in response
- adding replicas should allow the search rate to be reduced across the
increased number of replicas.
However, once the peak load period is over the collection is left with too many
replicas, which unnecessarily tie cluster resources. {{SearchRateTrigger}}
should detect situations like this and generate events that should cause some
of these replicas to be deleted.
{{SearchRateTrigger}} should use hysteresis to avoid thrashing when the rate is
close to the threshold.
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