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The following page has been changed by JasonRutherglen: http://wiki.apache.org/solr/BloomIndexComponent New page: = Introduction = <!> ["Solr1.5"] The !BloomIndexComponent !SearchComponent enables a fast and memory efficient membership test of an element in a read only set. False positives may be returned which can be tuned using a given probability (see the errorrate parameter). The Solr implementation generates the Bloom Filter per Lucene segment for a particular field by iterating over the term dictionary. see [http://en.wikipedia.org/wiki/Bloom_filter Wikipedia Bloom Filter] or [http://hadoop.apache.org/common/docs/current/api/org/apache/hadoop/util/bloom/BloomFilter.html Hadoop BloomFilter] = How it Works = To use the !BloomIndexComponent, The params are: * q={String} - The id to lookup (i.e. id:1) For a non-distributed membership test, the output returns true or false. For a distributed membership test, the output is the responses from the Solr shards. == Non-distributed Negative == {{{ http://localhost:8983/solr/bloom?q=id:1 }}} Check the membership of the value 1 in the field id (which does not exist). Results: {{{ <response> <lst name="responseHeader"> <int name="status">0</int> <int name="QTime">1</int> </lst> <str name="field">id</str> <str name="value">1</str> <str name="host">host.lightningstrike.com</str> <str name="exists">false</str> </response> }}} == Non-distributed Positive == {{{ http://localhost:8983/solr/bloom?q=id:1 }}} Check the membership of the value 1 in the field id (which does exist). Results: {{{ <response> <lst name="responseHeader"> <int name="status">0</int> <int name="QTime">1</int> </lst> <str name="exists">true</str> <str name="segment">_0</str> <str name="field">id</str> <str name="value">1</str> <str name="host">host.lightningstrike.com</str> </response> }}} == solrconfig.xml == {{{ <!-- Default Bloom Filter Implementation --> <searchComponent name="bloom" class="org.apache.solr.handler.component.BloomIndexComponent"> <str name="dir">bloom</str> <!-- optional --> <str name="field">id</str> <!-- optional --> <boolean name="autoreload">true</boolean> <!-- optional --> <str name="classname">org.apache.solr.bloom.BloomKeySet</str> <!-- optional --> <float name="errorrate">0.003f</float> <!-- optional --> <int name="hashcount">5</int> <!-- optional --> </searchComponent> <requestHandler name="/bloom" class="org.apache.solr.handler.component.SearchHandler"> <arr name="components"> <str>bloom</str> </arr> </requestHandler> }}}
