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<title>YaCy '#[clientname]#': Index Sources & Targets</title>
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<h2>Index Sources & Targets</h2>
<p>
YaCy supports multiple index storage locations.
As an internal indexing database a deep-embedded multi-core Solr is used and it is possible to attach also a remote Solr.
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<legend>Solr Search Index</legend>
Solr stores the main search index. It is the home of two cores, the default 'collection1' core for documents and the 'webgraph' core for a web structure graph. Detailed information about the used Solr fields can be edited in the <a href="IndexSchema_p.html">Schema Editor</a>.
<dl>
<dt class="TableCellDark">Lazy Value Initialization <input type="checkbox" name="solr.indexing.lazy" id="solr.indexing.lazy" #(solr.indexing.lazy.checked)#:: checked="checked"#(/solr.indexing.lazy.checked)# /></dt>
<dd>If checked, only non-zero values and non-empty strings are written to Solr fields.</dd>
<dt> </dt><dd> </dd>
<dt>Use deep-embedded local Solr <input type="checkbox" name="core.service.fulltext" id="core_service_fulltext" #(core.service.fulltext.checked)#:: checked="checked"#(/core.service.fulltext.checked)# onclick="if(!document.getElementById('config').core_service_fulltext.checked) {document.getElementById('config').solr_indexing_solrremote.checked = true;}"/></dt>
<dd>
This will write the YaCy-embedded Solr index which stored within the YaCy DATA directory.<br/>
The Solr native search interface is accessible at<br/>
<a href="solr/select?q=*:*&start=0&rows=3&core=collection1">/solr/select?q=*:*&start=0&rows=3&core=collection1</a>
for the default search index (core: collection1) and at<br/>
<a href="solr/select?q=*:*&start=0&rows=3&core=webgraph">/solr/select?q=*:*&start=0&rows=3&core=webgraph</a> for the webgraph core.<br/>
If you switch off this index, a remote Solr must be activated.</dd>
<dt>Use remote Solr server(s) <input type="checkbox" name="solr.indexing.solrremote" id="solr_indexing_solrremote" #(solr.indexing.solrremote.checked)#:: checked="checked"#(/solr.indexing.solrremote.checked)# onclick="if(!document.getElementById('config').solr_indexing_solrremote.checked) {document.getElementById('config').core_service_fulltext.checked = true;}"/></dt>
<dd>It's easy to <a href="http://www.yacy-websearch.net/wiki/index.php/Dev:Solr" target="_blank">attach an external Solr to YaCy</a>.
This external Solr can be used instead the internal Solr. It can also be used additionally to the internal Solr, then both Solr indexes are mirrored.
</dd>
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<dd>Solr Hosts<br/>
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<table class="sortable" border="0">
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<td><strong>Solr Host Administration Interface</strong><br/></td>
<td><strong>Index Size</strong></td>
</tr>
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<tr class="TableCell#(dark)#Light::Dark::Summary#(/dark)#">
<td><a href="#[url]#" target="_blank">#[url]#</a></td>
<td align="right">#[size]#</td>
</tr>
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</dd>
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<dd>Solr URL(s)<br/><textarea rows="2" cols="80" name="solr.indexing.url" id="solr.indexing.url"/>#[solr.indexing.url]#</textarea><br/>
You can set one or more Solr targets here which are accessed as a shard. For several targets, list them using a ',' (comma) as separator.
The set of remote targets are used as shard of a complete index. The host part of the url is used as key for a hash function which selects one of the shards (one of your remote servers).
When a search request is made, all servers are accessed synchronously and the result is combined.</dd>
<dt class="TableCellDark"></dt>
<dd>Sharding Method<br/>
<select id="solr.indexing.sharding" name="solr.indexing.sharding">
#{solr.indexing.sharding.methods}#
<option value="#[method]#" #(selected)#::selected="selected"#(/selected)#>#[method]#: #[description]#</option>
#{/solr.indexing.sharding.methods}#
</select></dd>
<dt class="TableCellDark"></dt>
<dd><input type="checkbox" name="solr.indexing.solrremote.writeenabled" id="solr_indexing_solrremote_writeenabled" #(solr.indexing.solrremote.writeenabled.checked)#:: checked="checked"#(/solr.indexing.solrremote.writeenabled.checked)#/> write-enabled (if unchecked, the remote server(s) will only be used as search peers)</dd>
<dt><input type="submit" name="setsolr" value="Set" /></dt><dd></dd>
</dd>
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<legend>
Web Structure Index
</legend>
The web structure index is used for host browsing (to discover the internal file/folder structure), ranking (counting the number of references) and file search (there are about fourty times more links from loaded pages as in documents of the main search index).
<dl>
<dt><input type="checkbox" name="core.service.citation.tmp" id="core_service_citation" #(core.service.citation.tmp.checked)#:: checked="checked"#(/core.service.citation.tmp.checked)# /></dt>
<dd>use citation reference index (lightweight and fast)</dd>
<dt><input type="checkbox" name="core.service.webgraph.tmp" id="core_service_webgraph" #(core.service.webgraph.tmp.checked)#:: checked="checked"#(/core.service.webgraph.tmp.checked)# /></dt>
<dd>use webgraph search index (rich information in second Solr core)</dd>
<dt><input type="submit" name="setcitation" value="Set" /></dt><dd></dd>
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<legend>
Peer-to-Peer Operation
</legend>
The 'RWI' (Reverse Word Index) is necessary for index transmission in distributed mode. For portal or intranet mode this must be switched off.
<dl>
<dt><input type="checkbox" name="core.service.rwi" id="core_service_rwi" #(core.service.rwi.checked)#:: checked="checked"#(/core.service.rwi.checked)# /></dt>
<dd>support peer-to-peer index transmission (DHT RWI index)</dd>
<dt><input type="submit" name="setrwi" value="Set" /></dt><dd></dd>
</dl>
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