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From "philip hoy (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-4449) Enable backup requests for the internal solr load balancer
Date Wed, 20 Feb 2013 16:37:20 GMT

    [ https://issues.apache.org/jira/browse/SOLR-4449?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13582304#comment-13582304
] 

philip hoy commented on SOLR-4449:
----------------------------------

Hi Raintung, I don't think there will be that many threads created, although it depends somewhat
on how the injected ThreadPoolExecuter and HttpClient are configured. 

For the good case, where the first shard responds within the delay period, there is I think
one thread for the orchestration code and one to send and receive the request.

For the bad case, where there are three shards all responding slowly and where the maximumConcurrentRequests
is set to 3 or higher then it will again use one thread for the the orchestration code but
this time there will be three threads used to send and receive responses for the three requests.


                
> 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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