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Date: Wed, 4 Apr 2012 23:28:21 +0000 (UTC)
From: "Martin Grotzke (Created) (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
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 <398128829.14837.1333582101533.JavaMail.tomcat@hel.zones.apache.org>
Subject: [jira] [Created] (SOLR-3318) LBHttpSolrServer should allow to
 specify a preferred server for a query
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LBHttpSolrServer should allow to specify a preferred server for a query
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                 Key: SOLR-3318
                 URL: https://issues.apache.org/jira/browse/SOLR-3318
             Project: Solr
          Issue Type: Improvement
          Components: clients - java
    Affects Versions: 4.0
            Reporter: Martin Grotzke
            Priority: Minor


For a user query we make several solr queries that differ only slightly and therefore should use/reuse objects cached from the first query (we're using a custom request handler and custom caches).
Thus such subsequent queries should hit the same solr server.

The implemented solution looks like this:
* The client obtains a live SolrServer from LBHttpSolrServer
* The client provides this SolrServer as preferred server for a query
* If the preferred server is no longer alive the request is retried on another live server
* Everything else follows the existing logic:
** After live servers are exhausted, any servers previously marked as dead will be tried before failing the request
** If no live servers are found a SolrServerException is thrown

The implementation is also [on github|https://github.com/magro/lucene-solr/commit/a75aef3d].

Mailing list thread: http://lucene.472066.n3.nabble.com/LBHttpSolrServer-to-query-a-preferred-server-tt3884140.html

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