titan

1. 简介
   （1）titan：存储，查询图形结构的数据库。分布式集群环境下，可支持数以千亿级别的点和边，同时支持上千个并发的实时的复杂图形遍历，支持ACID事务。
   （2）架构：支持以下3方面的自由组合
   • 节点和边的存储：
     • Apache Cassandra
     • Apache HBase
     • Oracle BerkeleyDB（测试使用）
   • 图形分析组件：
     • Spark
     • Giraph
     • Hadoop
   • 地理，数值，全文检索支持
     • ElasticSearch
     • Solr
     • Lucene
2. titan-hbase-es部署范例
   （1）版本对应
   titan:0.54-hadoop2，hbase:1.1.5 (版本相对宽松)，elasticsearch:1.4，rexster-server:2.6
   （2）titan server部署
   • rexster-server解压

   • 修改config/rexster.xml文件,添加如下内容

     <graph><graph-enabled>true</graph-enabled><graph-name>titanexample</graph-name><graph-type>com.thinkaurelius.titan.tinkerpop.rexster.TitanGraphConfiguration</graph-type><graph-location></graph-location><graph-read-only>false</graph-read-only><properties>  
     <storage.backend>hbase</storage.backend>
     <storage.hostname>localhost:2181,localhost:2182,localhost:2183</storage.hostname>
     <storage.hbase.table>facebook</storage.hbase.table>
     <index.search.backend>elasticsearch</index.search.backend>
     <index.search.elasticsearch.client-only>true</index.search.elasticsearch.client-only>
     <index.search.hostname>127.0.0.1</index.search.hostname>
     <index.search.index-name>facebook</index.search.index-name></properties><extensions><allows><allow>tp:gremlin</allow></allows></extensions>
     </graph>

   • 复制titan jar包到rexster lib

   cp   TITAN_HOME/lib/*    REXSTER_HOME/ext/titan/

   • 删除rexster/lib下的lucene相关jar包，会与titan的引起冲突
   • 开启rexster

   ./bin/rexster.sh -s -c ./config/rexster.xml

   • 访问http://ip:8182/graphs/titanexample，REST

3. titan server接口
   （1）RexPro二进制协议
   java public class TestClient { public static void main(String[] args) throws Exception { RexsterClient client = RexsterClientFactory.open("localhost", "titanexample"); List<Map<String,Object>> result; result = client.execute("aa=g.V.has('name','saturn');aa.next()"); //result = client.execute("g.getManagementSystem().get(‘cache.db-cache’)"); // result.toString(): [{name="jupiter"}] System.out.println(result); client.close(); } }
xml <dependency> <groupId>com.tinkerpop.rexster</groupId> <artifactId>rexster-protocol</artifactId> <version>2.6.0</version> </dependency>
   （2）thinkerpop – REST协议

4. “红楼梦宗谱”示例
   （1）编写blueprint脚本，设置schema，索引，添加将节点数据
   ```java
   com.thinkaurelius.titan.core.schema.TitanManagement mgmt = g.getManagementSystem();
   //点的属性名
   com.thinkaurelius.titan.core.PropertyKey name = mgmt.makePropertyKey("name").dataType(String.class).make();
   com.thinkaurelius.titan.core.PropertyKey age = mgmt.makePropertyKey("age").dataType(Integer.class).make();
   // 点的标签名
   mgmt.makeVertexLabel("people").make(); //该点表示人
   mgmt.makeVertexLabel("hobby").make(); //该点是一个运动
   // 给点的姓名年龄建索引
   mgmt.buildIndex("name",Vertex.class).addKey(name).unique().buildCompositeIndex(); // "search"是配置文件中的标识符
   mgmt.buildIndex("vertices",Vertex.class).addKey(age).buildMixedIndex("search"); // mixedIndex是外部索引，用es存储索引

   // 边的属性
   mgmt.makeEdgeLabel("father").multiplicity(com.thinkaurelius.titan.core.Multiplicity.MANY2ONE).make();
   mgmt.makeEdgeLabel("mother").multiplicity(com.thinkaurelius.titan.core.Multiplicity.MANY2ONE).make();
   mgmt.makeEdgeLabel("hobby").multiplicity(com.thinkaurelius.titan.core.Multiplicity.MULTI).make();
   com.thinkaurelius.titan.core.PropertyKey time = mgmt.makePropertyKey("time").dataType(Integer.class).make();
   com.thinkaurelius.titan.core.EdgeLabel love = mgmt.makeEdgeLabel("love").signature(time).make();//什么时候确立爱情挂席
   mgmt.buildEdgeIndex(love,"lovetime", Direction.BOTH, com.thinkaurelius.titan.core.Order.DESC,time);
   mgmt.commit();

   //插入点
   com.thinkaurelius.titan.core.TitanTransaction tx = g.newTransaction();
   Vertex jiazheng = tx.addVertexWithLabel("people"); // 贾政
   jiazheng.setProperty("name","贾政");
   jiazheng.setProperty("age",48);
   Vertex jiabaoyu = tx.addVertexWithLabel("people"); // 贾宝玉
   jiabaoyu.setProperty("name","贾宝玉");
   jiabaoyu.setProperty("age",18);
   Vertex wangfuren = tx.addVertexWithLabel("people"); // 王夫人
   wangfuren.setProperty("name","王夫人");
   wangfuren.setProperty("age",47);
   Vertex xuebaochai = tx.addVertexWithLabel("people"); // 薛宝钗
   xuebaochai.setProperty("name","薛宝钗");
   xuebaochai.setProperty("age",17);

   Vertex cixiu = tx.addVertexWithLabel("hobby");
   cixiu.setProperty("name","刺绣");
   Vertex zuoshi = tx.addVertexWithLabel("hobby");
   zuoshi.setProperty("name","作诗");

   //插入边
   jiabaoyu.addEdge("father",jiazheng);
   jiabaoyu.addEdge("mother",wangfuren);
   ElementHelper.setProperties(jiabaoyu.addEdge("love",xuebaochai),"time",1001); // 贾宝玉爱林黛玉，"time"属性为1001
   wangfuren.addEdge("hobby",cixiu);
   xuebaochai.addEdge("hobby",zuoshi);

   tx.commit();
   （2）通过RexPro协议发送脚本到服务器java
   public static void main(String[] args) throws Exception {
   RexsterClient client = RexsterClientFactory.open("localhost", "titanexample");
   List<Map<String,Object>> result;
   BufferedReader br = new BufferedReader(new InputStreamReader(Thread.currentThread().getContextClassLoader().getResourceAsStream("facebook-gremlin")));
   String str="";
   StringBuffer sb = new StringBuffer();
   while((str = br.readLine())!=null){
   sb.append(str);
   }
   System.out.println(sb.toString());
   result = client.execute(sb.toString());
   System.out.println(result);
   client.close();
   }
   （3）rest apishell
   curl -XGET http://localhost:8182/graphs/titanexample/vertices #查看所有边
   curl -XGET http://localhost:8182/graphs/titanexample/edges
   curl -XGET http://localhost:8182/graphs/titanexample/keyindices
   curl -XGET http://localhost:8182/graphs/titanexample/vertices/16400/in #查询节点的入射边
   curl -XPOST http://localhost:8182/graphs/titanexample/vertices/11111?name=zhangsan&age=24 #创建节点
   curl -XPOST http://localhost:8182/graphs/titanexample/edges?_outV=&_label=friend&_inV=2&=<key'> #创建节点间的边
   ```

   （4）gremlin查询示例，查询贾宝玉的父亲

   gremlin> g.V.has('name','贾宝玉').next().out('father').name
   ==>贾政

   （5）全文检索节点,按照es的格式封装的map

   result = client.execute("g.indexQuery(\"vertices\", \"v.age:(17)\").vertices().get(0).getElement()");
   for (Map<String, Object> map : result) {for (Map.Entry<String, Object> en : map.entrySet()) {System.out.print(en.getKey()+":"+en.getValue()+"\t\t");}System.out.println();
   }
   /**
   _type:vertex        _properties:{name=薛宝钗, age=17}      _id:16496   
   */

5. 数据展现
   • Sigma.js it's a free and open source tool for graph visualization quite nice. Linkurious is using a fork version of it as far as I know in their product.
   • VivaGraph it's another free and open source tool for graph visualization tool – but it has a smaller community compared to SigmaJS.
   • D3.js it's the factotum for data visualization, you can do basically every kind of visualization based on that, but the learning curve is quite steep.
   • Gephi is another free and open source desktop solution, you have to use an external plugin with that probably but it does support most of the formats out there – graphML, CSV, Neo4J, etc…

6. 参考网站
   thinkerpop
   gremlin与sql对比查询语法
   sparql-gremlin插件
   DataStax给出的图形查询语言，包括sparql，GraphQL, Cypher, Gremlin

转载于:https://www.cnblogs.com/72808ljup/p/5587714.html