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From "Otis Gospodnetic (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-4449) Enable backup requests for the internal solr load balancer
Date Fri, 13 Dec 2013 03:53:10 GMT

    [ https://issues.apache.org/jira/browse/SOLR-4449?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13847128#comment-13847128
] 

Otis Gospodnetic commented on SOLR-4449:
----------------------------------------

Nice one, [~phloy]!

bq. Hi Philip - can you show some 99th percentile measurements of a cluster receiving a decent
amount of concurrent requests? With and without your patch?

+1 for this - I'd love to see the same.

Also, another idea:
I'm assuming this patch *always* sends an extra request right away.  How about sending just
1 request first and then firing the 2nd one only if the 1st one hasn't returned after N milliseconds?
 This way the price of an extra request will be paid only sometimes.  Using N=-1 or N=0 could
mean "send both right away".

> 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, SOLR-4449.patch, SOLR-4449.patch, patch-4449.txt,
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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