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https://issues.apache.org/jira/browse/SOLR-4449?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13580713#comment-13580713
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philip hoy commented on SOLR-4449:
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Here is some information supporting the idea of using backup requests to
improve latency. Below are links for a slide deck from Google and some
interesting blog posts:
* http://research.google.com/people/jeff/latency.html
*
http://highscalability.com/blog/2012/6/18/google-on-latency-tolerant-systems-making-a-predictable-whol.html
*
http://www.bailis.org/blog/doing-redundant-work-to-speed-up-distributed-queries/
Also for reference here is some further discussion on the issue from solr-user
mailing list:
*
http://mail-archives.apache.org/mod_mbox/lucene-solr-user/201302.mbox/%3c81e9a7879c550b42a767f0b86b2b815929efb...@ex4.corp.w3data.com%3E
> Enable backup requests for the internal solr load balancer
> ----------------------------------------------------------
>
> Key: SOLR-4449
> URL: https://issues.apache.org/jira/browse/SOLR-4449
> Project: Solr
> Issue Type: New Feature
> Components: SolrCloud
> Reporter: philip hoy
> Priority: Minor
> Attachments: SOLR-4449.patch
>
>
> Add the ability to configure the built-in solr load balancer such that it
> submits a backup request to the next server in the list if the initial
> request takes too long. Employing such an algorithm could improve the latency
> of the 9xth percentile albeit at the expense of increasing overall load due
> to additional requests.
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