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https://issues.apache.org/jira/browse/SOLR-4449?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13585565#comment-13585565
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Raintung Li commented on SOLR-4449:
-----------------------------------
Let me describe it clear to make the same page.
Normal case:
Client send 1 request for search, the Servlet will have handle request thread
that we call it is request main thread.
Then main thread will start 3 threads to send the request to 3 shards, because
this collection has 3 shards.
Main thread block to wait the full 3 threads(shards) response.
Result:
We need 4 threads in the normal case that don't send the second request.
Your case:
Client send 1 request search .....
Then main thread will start 6 threads to send the request to 3 shards......
Main thread block to wait the 3 threads response, the other 3 threads are
stared in the LB
Result:
We need 7 threads in the normal case that don't send the second request.
My case:
Client send 1 request for search, ....
Then this thread will .....
Change: Main thread wait the 3 threads response in the fixed time. Which shard
is overtime, main thread submit the second request.
Result:
We need 4 threads in the normal case that don't send the second request.
> 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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