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https://issues.apache.org/jira/browse/SOLR-255?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12508394
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Yonik Seeley commented on SOLR-255:
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A few other considerations for good scalability:
- shards should be searched in parallel
- there needs to be multiple copies of each shard (esp for HA), with failover,
otherwise splitting and distributing the index will lead to higher failure
rates.
> RemoteSearchable for Solr(use RMI)
> ----------------------------------
>
> Key: SOLR-255
> URL: https://issues.apache.org/jira/browse/SOLR-255
> Project: Solr
> Issue Type: Improvement
> Components: search
> Reporter: Toru Matsuzawa
> Attachments: solr-multi20070606.zip
>
>
> I experimentally implemented RemoteSearchable of Lucene for Solr.
> I referred to "FederatedSearch" and used RMI.
> Two or more Searchers can be referred to with SolrIndexSearcher.
> These query-only indexes can be specified in solrconfig.xml,
> enumerating the list under a <searchIndex> tag.
> <searchIndex>
> <lst>E:\sample\data1</lst>
> <lst>E:\sample\data2</lst>
> <lst>rmi://localhost</lst>
> </searchIndex>
> The index in the dataDir is also used as the default index of solr
> to update and query.
> When data of a document in a index specified under the <searchIndex> is
> updated,
> that document data in the index will be deleted and data of the updated
> document will be stored
> in the index in the dataDir.
> SolrRemoteSearchable (the searcher for remote access) is started from
> SolrCore
> by specifying "< remoteSearcher>true</remoteSearcher >" in solrconfig.xml.(It
> is registered in RMI. )
> ("-Djava.security.policy" should be set when you start VM. )
> Not all of the operational cases are tested
> because Solr has so many features.
> Moreover, TestUnit has not been made
> because I made this through a trial and error process.
> Some changes are required in Lucene to execute this.
> I need your comments on this although it might be hard without TestUnit.
> I especially worry about the followings:
> - Am I on the right truck about this issue?
> - Is the extent of modifying Lucene tolerable?
> - Are there any ideas to implement this feature without modifying Lucene?
> - Does this idea contribute for improving Solr?
> - This implementation may partially overlap with "Multiple Solr Cores".
> What should be done?
> - Are there any other considerations about this issue, which I have
> overlooked?
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