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https://issues.apache.org/jira/browse/SOLR-11833?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16439761#comment-16439761
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Andrzej Bialecki commented on SOLR-11833:
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This patch contains the following changes and additions:
* configurable upper and lower thresholds, as well as actions to be taken on
each condition
* separate actions to be taken when node-level rates are above / below
thresholds
* configurable metric that determines the "search rate" (by default it's
{{QUERY./select.requestTimes:1minRate}})
* configurable limits on the minimum / maximum number of operations to
request, depending on how much the thresholds are exceeded and on the
replication factor and the current number of searchable replica types.
* unit and integration tests
Documentation to follow shortly.
> 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
> Priority: Major
> Fix For: 7.4, master (8.0)
>
> Attachments: SOLR-11833.patch
>
>
> 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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