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https://issues.apache.org/jira/browse/SOLR-2809?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13120267#comment-13120267
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Michael McCandless commented on SOLR-2809:
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I've been working on a similar idea, as a standalone utility class, that 
records searchers keyed by their IR.getVersion().

I think this is important not only for consistency within a single distributed 
search request, but also across requests when a user does a follow-on action 
(next page, drill down/up, etc.), especially now that we have searchAfter where 
the "last bottom" can easily shift.

I'll open a new issue; I'm not sure we can combine the approaches but maybe...
                
> searcher leases
> ---------------
>
>                 Key: SOLR-2809
>                 URL: https://issues.apache.org/jira/browse/SOLR-2809
>             Project: Solr
>          Issue Type: New Feature
>            Reporter: Yonik Seeley
>
> Leases/reservations on searcher instances would give us the ability to use 
> the same searcher across phases of a distributed search, or for clients to 
> send multiple requests and have them hit a consistent/unchanging view of the 
> index. The latter requires something extra to ensure that the load balancer 
> contacts the same replicas as before.

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