{"id":524,"date":"2015-07-27T11:19:48","date_gmt":"2015-07-27T11:19:48","guid":{"rendered":"http:\/\/blog.stratio.com\/?p=524"},"modified":"2023-09-20T13:37:15","modified_gmt":"2023-09-20T13:37:15","slug":"stratio-lucene-based-index-for-cassandra-now-plugin","status":"publish","type":"post","link":"https:\/\/www.stratio.com\/blog\/stratio-lucene-based-index-for-cassandra-now-plugin\/","title":{"rendered":"Stratio\u2019s Lucene-based index for Cassandra is now a plugin"},"content":{"rendered":"<p style=\"text-align: justify;\">Thanks to the changes proposed at&nbsp;<a href=\"https:\/\/issues.apache.org\/jira\/browse\/CASSANDRA-8717\" target=\"_blank\" rel=\"noopener\">CASSANDRA-8717<\/a>,&nbsp;<a href=\"https:\/\/issues.apache.org\/jira\/browse\/CASSANDRA-7575\" target=\"_blank\" rel=\"noopener\">CASSANDRA-7575<\/a>&nbsp;and&nbsp;<a href=\"https:\/\/issues.apache.org\/jira\/browse\/CASSANDRA-6480\" target=\"_blank\" rel=\"noopener\">CASSANDRA-6480<\/a>, Stratio is glad to present its<strong>&nbsp;<a href=\"https:\/\/github.com\/Stratio\/cassandra-lucene-index\" target=\"_blank\" rel=\"noopener\">Lucene-based implementation of Cassandra secondary indexes<\/a><\/strong>&nbsp;as a plugin that can be attached to the&nbsp;<strong>Apache distribution<\/strong>. Before the above changes,&nbsp;<strong>Lucene<\/strong>&nbsp;index was distributed inside a fork of&nbsp;<strong>Apache Cassandra<\/strong>, with all the difficulties it implied, i.e. maintaining a fork. As of now, the fork is discontinued and new users should use the recently created plugin, which maintains all the features of&nbsp;<strong><a href=\"https:\/\/github.com\/Stratio\/stratio-cassandra\" target=\"_blank\" rel=\"noopener\">Stratio Cassandra<\/a><\/strong>.<\/p>\n<p><!--more--><\/p>\n<p style=\"text-align: justify;\">Stratio&#8217;s&nbsp;<strong>Lucene<\/strong>&nbsp;index extends<strong>&nbsp;Cassandra<\/strong>\u2019s functionality to provide near real-time distributed search engine capabilities such as with<strong>&nbsp;ElasticSearch<\/strong>&nbsp;or&nbsp;<strong>Solr<\/strong>, including full text search capabilities, free multivariable search,relevance queries and field-based sorting. Each node indexes its own data, so high availability and scalability is guaranteed.<\/p>\n<p style=\"text-align: justify;\">With the new distribution as a plugin you can easily patch an existing installation of Cassandra with the following command:<\/p>\n<p style=\"text-align: center;\"><strong>&nbsp;<\/strong><strong>mvn clean package -Ppatch -Dcassandra_home=&lt;CASSANDRA_INSTALL_DIR&gt;<\/strong><\/p>\n<p style=\"text-align: justify;\">Now, given an existing table with the following schema<\/p>\n<div>\n<pre class=\"lang:default decode:true \">CREATE TABLE tweets (\n&nbsp; &nbsp;id &nbsp; &nbsp; &nbsp; &nbsp;bigint,\n&nbsp; &nbsp;createdAt timestamp,\n&nbsp; &nbsp;message &nbsp; text,\n&nbsp; &nbsp;userid &nbsp; &nbsp;bigint,\n&nbsp; &nbsp;username &nbsp;text,\n&nbsp; &nbsp;PRIMARY KEY (userid, createdAt, id) );<\/pre>\n<\/div>\n<p>you can create a Lucene index with this query:<\/p>\n<div>\n<pre class=\"lang:default decode:true \">ALTER TABLE tweets ADD lucene TEXT;\nCREATE CUSTOM INDEX tweets_idx ON &nbsp;twitter.tweets (lucene)&nbsp;\nUSING 'com.stratio.cassandra.lucene.Index'&nbsp;\nWITH OPTIONS = {\n&nbsp; &nbsp;'refresh_seconds' &nbsp; &nbsp;: '60',\n&nbsp; &nbsp;'schema' : '{ default_analyzer : \"English\",\n&nbsp; &nbsp; &nbsp;fields : {\n&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;createdat : {type : \"date\", pattern : \"yyyy-MM-dd\"},&nbsp;\n&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;message &nbsp; : {type : \"text\", analyzer : \"English\"},&nbsp;\n&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;userid &nbsp; &nbsp;: {type : \"string\"},&nbsp;\n&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;username &nbsp;: {type : \"string\"}\n&nbsp; &nbsp; &nbsp; &nbsp;}} &nbsp; &nbsp;&nbsp;\n'};<\/pre>\n<\/div>\n<p style=\"text-align: justify;\">Once the index has been created, we can start issuing queries. For instance, retrieve 10 tweets containing the word Cassandra in the message body:<\/p>\n<div>\n<pre class=\"lang:default decode:true\">SELECT * FROM tweets WHERE lucene = \u2018{\n&nbsp; &nbsp;filter : {type &nbsp;: \"match\",&nbsp;\n&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;field : \"message\",\n&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;value : \"cassandra\"}\n}\u2019 LIMIT 10;<\/pre>\n<\/div>\n<p style=\"text-align: justify;\">We can also find the 5 best matching tweets containing the word Cassandra in the message body for the previous query, involving Lucene relevance features:<\/p>\n<div>\n<pre class=\"lang:default decode:true\">SELECT * FROM tweets WHERE lucene = \u2018{\n&nbsp; &nbsp;query: {type: \"match\",&nbsp;\n&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;field : \"message\",\n&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;value : \"cassandra\"}\n}\u2019 LIMIT 5;<\/pre>\n<\/div>\n<p style=\"text-align: justify;\">Queries, filters and boolean predicates can be combined to do queries as complex as requesting the tweets inside a certain time range starting with an &#8216;A&#8217; or containing a &#8216;B&#8217;, or with the word &#8216;FAST&#8217;, sorting them by ascending time, and then by descending alphabetic user name:<\/p>\n<div>\n<pre class=\"lang:default decode:true\">SELECT * FROM tweets WHERE lucene = '{\n   filter : \n   {\n    type : \"boolean\", must : \n    [\n       {type : \"range\", field : \"createdat\", lower : \"2014-04-25\"},\n       {type : \"boolean\", should : \n        [\n           {type : \"prefix\", field : \"userid\", value : \"a\"} ,\n           {type : \"wildcard\", field : \"userid\", value : \"*b*\"} ,\n           {type : \"match\", field : \"userid\", value : \"fast\"} \n        ]\n       }\n    ]\n   },\n   sort : \n   {\n     fields: [ {field :\"createdat\", reverse : true},\n               {field : \"userid\", reverse : false} ] \n   }\n}' LIMIT 10000;<\/pre>\n<\/div>\n<p style=\"text-align: justify;\">You can learn more about Stratio&#8217;s Lucene index for Cassandra reading the&nbsp;<a href=\"https:\/\/github.com\/Stratio\/cassandra-lucene-index\/blob\/branch-2.1.8\/doc\/src\/site\/sphinx\/documentation.rst\" target=\"_blank\" rel=\"noopener\">comprehensive documentation<\/a>&nbsp;or viewing the video of its presentation at<strong>&nbsp;<a href=\"http:\/\/planetcassandra.org\/video-presentations\/vp\/cassandra-summit-europe-2014\/vd\/stratio-advanced-search-and-top-k-queries-in-cassandra\/\" target=\"_blank\" rel=\"noopener\">Cassandra Summit Europe 2014<\/a>.<\/strong><\/p>\n<p style=\"text-align: justify;\">We will be back very soon with new exciting features such as geospatial search and bitemporal indexing.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Thanks to the changes proposed at\u00a0CASSANDRA-8717,\u00a0CASSANDRA-7575\u00a0and\u00a0CASSANDRA-6480, Stratio is glad to present its\u00a0Lucene-based implementation of Cassandra secondary indexes\u00a0as a plugin that can be attached to the\u00a0Apache distribution. <\/p>\n","protected":false},"author":1,"featured_media":13989,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[686],"tags":[],"ppma_author":[795],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.9 (Yoast SEO v22.9) - 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