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https://issues.apache.org/jira/browse/SOLR-11833?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16449551#comment-16449551
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ASF subversion and git services commented on SOLR-11833:
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Commit 9541d7e38b4c6b7ac779d76e2728a7bb3a301d36 in lucene-solr's branch
refs/heads/branch_7x from [~ab]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=9541d7e ]
SOLR-11833: Allow searchRate trigger to delete replicas.
> 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, 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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