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https://issues.apache.org/jira/browse/SOLR-4449?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13759148#comment-13759148
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philip hoy commented on SOLR-4449:
----------------------------------
[~isaachebsh], to test, just drop the attached jar into the shared lib folder
and add the shardHandlerFactory configuration to the requestHandler node in the
solrconfig.xml:
{code:xml}
<requestHandler default="true" name="standard" class="solr.SearchHandler">
<shardHandlerFactory class="HttpBackupRequestShardHandlerFactory">
<int name="backupRequestDelay">1500</int>
<int name="maximumConcurrentRequests">2</int>
</shardHandlerFactory>
</requestHandler>
{code}
I too have no idea why the HttpShardHandler contains that comment. However for
the sake of caching, hitting the same replica could be beneficial i guess.
> 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: patch-4449.txt, SOLR-4449.patch, SOLR-4449.patch,
> SOLR-4449.patch, solr-back-request-lb-plugin.jar
>
>
> 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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