使用elasticsearch建立搜索引擎

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使用elasticsearch建立搜索引擎 2018-12-15 16:19:02 Fighting_No1 阅读数 274更多 分类专栏: 文本挖掘 版权声明:本文为博主原创文章,遵循 CC 4.0 BY-SA 版权协议,转载请附上原文出处链接和本声明。 本文链接:https://blog.csdn.net/Fighting_No1/article/details/85015245 使用elasticsearch建立搜索引擎 elasticsearch官方网址:https://www.elastic.co/products/elasticsearch

1、选择Elasticsearch的原因 (1)Elasticsearch是一个建立在全文搜索引擎 Apache Lucene™ 基础上的开源的实时分布式搜索和分析引擎,功能强大:

支持全文搜索; 分布式实时文件存储,并将每一个字段都编入索引,使其可以被搜索; 实时分析的分布式搜索引擎; 可以扩展到上百台服务器,处理PB级别的结构化或非结构化数据。 所有的这些功能被集成到一个服务里面,你的应用可以通过简单的RESTful API、各种语言的客户端甚至命令行与之交互。

(2)简单易学,文档齐全

搜索引擎选择: Elasticsearch与Solr:http://www.cnblogs.com/chowmin/articles/4629220.html

2、安装并配置Elasticsearch 因为我们要使用ansj分词工具进行分词,最新的ansj与elasticsearch结合的工具包对应的elastic search的版本是5.0.1,所以我们下载5.0.1版本的elasticsearch。

(1)下载并解压

wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-5.0.1.tar.gz sha1sum elasticsearch-5.0.1.tar.gz tar -xzf elasticsearch-5.0.1.tar.gz cd elasticsearch-5.0.1/ 1 2 3 4 (2)启动ES

./bin/elasticsearch

16-12-11T17:28:33,912][INFO ][o.e.n.Node ] [rpA7Jx3] started

看到类似这一句的,则说明启动ES了

新开一个终端,查看是否运行成功

curl -XGET ‘localhost:9200/?pretty’

出现如上形式内容,则说明ES运行成功。

可以按Ctrl-C关闭ES

3、安装并配置ansj分词器 进入es目录执行如下命令

./bin/elasticsearch-plugin install http://maven.nlpcn.org/org/ansj/elasticsearch-analysis-ansj/5.0.1.0/elasticsearch-analysis-ansj-5.0.1.0-release.zip

4、elasticsearch启动出现的错误解决 (1)Java HotSpot™ 64-Bit Server VM warning: INFO: os::commit_memory(0x0000000085330000, 2060255232, 0) failed; error=‘Cannot allocate memory’ (errno=12)

由于elasticsearch5.0默认分配jvm空间大小为2g,修改jvm空间分配

vim config/jvm.options

-Xms2g -Xmx2g 1 2 3 修改为

-Xms512m -Xmx512m 1 2 (2)max number of threads [1024] for user [elasticsearch] is too low, increase to at least [2048]

修改 /etc/security/limits.d/90-nproc.conf

原: soft nproc 1024 改为: soft nproc 2048

(3)max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]

修改/etc/sysctl.conf配置文件,

cat /etc/sysctl.conf | grep vm.max_map_count vm.max_map_count=262144 1 2 如果不存在则添加

echo “vm.max_map_count=262144” >>/etc/sysctl.conf

(4)max file descriptors [65535] for elasticsearch process likely too low, increase to at least [65536]

ulimit -n 65536

(5)[root@localhost elasticsearch-5.0.1]# ./bin/elasticsearch [WARN ][o.e.b.ElasticsearchUncaughtExceptionHandler] [] uncaught exception in thread [main] org.elasticsearch.bootstrap.StartupException: java.lang.RuntimeException: can not run elasticsearch as root

注意:ES不能用root管理员身份启动

5、配置elasticsearch Java API 在pom.xml添加如下依赖:

org.elasticsearch.client transport 5.0.1 org.apache.logging.log4j log4j-api 2.8.0 org.apache.logging.log4j log4j-core 2.8.0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 6、elasticsearch教程 官方教程:https://www.elastic.co/guide/en/elasticsearch/reference/current/zip-targz.html Elasticsearch基础教程:http://blog.csdn.net/cnweike/article/details/33736429 Elasticsearch JAVA API教程:http://www.07net01.com/2016/07/1603264.html 1. Java API批量导出 Settings settings = ImmutableSettings.settingsBuilder().put("cluster.name", "elasticsearch-bigdata").build(); Client client = new TransportClient(settings) .addTransportAddress(new InetSocketTransportAddress("10.58.71.6", 9300)); SearchResponse response = client.prepareSearch("bigdata").setTypes("student") .setQuery(QueryBuilders.matchAllQuery()).setSize(10000).setScroll(new TimeValue(6000 00)) .setSearchType(SearchType.SCAN).execute().actionGet();//setSearchType(SearchType.Scan) 告诉ES不需要排序只要结果返回即可 setScroll(new TimeValue(600000)) 设置滚动的时间 String scrollid = response.getScrollId(); try { //把导出的结果以JSON的格式写到文件里 BufferedWriter out = new BufferedWriter(new FileWriter("es", true)); //每次返回数据10000条。一直循环查询直到所有的数据都查询出来 while (true) { SearchResponse response2 = client.prepareSearchScroll(scrollid).setScroll(new TimeValue(1000000)) .execute().actionGet(); SearchHits searchHit = response2.getHits(); //再次查询不到数据时跳出循环 if (searchHit.getHits().length == 0) { break; } System.out.println("查询数量 :" + searchHit.getHits().length); for (int i = 0; i < searchHit.getHits().length; i++) { String json = searchHit.getHits()[i].getSourceAsString(); out.write(json); out.write("\r\n"); } } System.out.println("查询结束"); out.close();

} catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 2. Java API 批量导入 Settings settings = ImmutableSettings.settingsBuilder().put(“cluster.name”, “elasticsearch-bigdata”).build(); Client client = new TransportClient(settings) .addTransportAddress(new InetSocketTransportAddress(“10.58.71.6”, 9300)); try { //读取刚才导出的ES数据 BufferedReader br = new BufferedReader(new FileReader(“es”)); String json = null; int count = 0; //开启批量插入 BulkRequestBuilder bulkRequest = client.prepareBulk(); while ((json = br.readLine()) != null) { bulkRequest.add(client.prepareIndex(“bigdata”, “student”).setSource(json)); //每一千条提交一次 if (count% 1000==0) { bulkRequest.execute().actionGet(); System.out.println(“提交了:” + count); } count++; } bulkRequest.execute().actionGet(); System.out.println(“插入完毕”); br.close(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 elasticsearch导入数据的两种方法 第一种方法:手动导入 1、cat test.json

{“index”:{"_index":“stuff_orders”,"_type":“order_list”,"_id":903713}} {“real_name”:“刘备”,“user_id”:48430,“address_province”:“上海”,“address_city”:“浦东新区”,“address_district”:null,“address_street”:“上海市浦东新区广兰路1弄2号345室”,“price”:30.0,“carriage”:6.0,“state”:“canceled”,“created_at”:“2013-10-24T09:09:28.000Z”,“payed_at”:null,“goods”:[“营养早餐:火腿麦满分”],“position”:[121.53,31.22],“weight”:70.0,“height”:172.0,“sex_type”:“female”,“birthday”:“1988-01-01”} 1 2 2、导入elasticsearch

[root@ELKServer opt]# curl -XPOST ‘localhost:9200/stuff_orders/_bulk?pretty‘ --data-binary @test.json { “took” : 600, “errors” : false, “items” : [ { “index” : { “_index” : “stuff_orders”, “_type” : “order_list”, “_id” : “903713”, “_version” : 1, “_shards” : { “total” : 2, “successful” : 1, “failed” : 0 }, “status” : 201 } } ] } 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 3、查看elasticsearch是否存在数据

[root@ELKServer opt]# curl localhost:9200/stuff_orders/order_list/903713?pretty { “_index” : “stuff_orders”, “_type” : “order_list”, “_id” : “903713”, “_version” : 1, “found” : true, “_source” : { “real_name” : “刘备”, “user_id” : 48430, “address_province” : “上海”, “address_city” : “浦东新区”, “address_district” : null, “address_street” : “上海市浦东新区广兰路1弄2号345室”, “price” : 30.0, “carriage” : 6.0, “state” : “canceled”, “created_at” : “2013-10-24T09:09:28.000Z”, “payed_at” : null, “goods” : [ “营养早餐:火腿麦满分” ], “position” : [ 121.53, 31.22 ], “weight” : 70.0, “height” : 172.0, “sex_type” : “female”, “birthday” : “1988-01-01” } } 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 第二种方法:从数据库中导入 1、下载安装插件elasticsearch-jdbc-2.3.4.0

wget http://xbib.org/repository/org/xbib/elasticsearch/importer/elasticsearch-jdbc/2.3.4.0/elasticsearch-jdbc-2.3.4.0-dist.zip

elasticsearch-jdbc-2.3.4.0-dist.zip的版本要和你安装的elasticsearch对应。

unzip elasticsearch-jdbc-2.3.4.0-dist.zip mv elasticsearch-jdbc-2.3.4.0 /usr/local/ cd /usr/local/elasticsearch-jdbc-2.3.4.0/ 1 2 3 4 5 2、配置脚本

vim import.sh #!/bin/sh JDBC_IMPORTER_HOME=/usr/local/elasticsearch-jdbc-2.3.4.0 bin= J D B C I M P O R T E R H O M E / b i n l i b = JDBC_IMPORTER_HOME/bin lib= JDBCIMPORTERHOME/binlib=JDBC_IMPORTER_HOME/lib echo ‘{ “type” : “jdbc”, “jdbc”: { “elasticsearch.autodiscover”:true, “elasticsearch.cluster”:“my-application”, #簇名 详见:/usr/local/elasticsearch/config/elasticsearch.yml “url”:“jdbc:mysql://localhost:3306/test”, #mysql数据库地址 “user”:“test”, #mysql用户名 “password”:“1234”, #mysql密码 “sql”:“select *,id as _id from workers_info”, “elasticsearch” : { “host” : “192.168.10.49”, “port” : 9300 }, “index” : “myindex”, #新的index “type” : “mytype” #新的type } }‘| java -cp " l i b / ∗ " − D l o g 4 j . c o n f i g u r a t i o n F i l e = {lib}/*" -Dlog4j.configurationFile= lib/"Dlog4j.configurationFile={bin}/log4j2.xml org.xbib.tools.Runner org.xbib.tools.JDBCImporter chmod + import.sh sh import.sh 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 3、查看数据是否导入elasticsearch

[root@ELKServer bin]# curl -XGET ‘http://localhost:9200/myindex/mytype/_search?pretty‘ { “took” : 15, “timed_out” : false, “_shards” : { “total” : 5, “successful” : 5, “failed” : 0 }, “hits” : { “total” : 1, “max_score” : 1.0, “hits” : [ { “_index” : “myindex”, “_type” : “mytype”, “_id” : “AVZyXCReGHjmX33dpJi3”, “_score” : 1.0, “_source” : { “id” : 1, “workername” : “xing”, “salary” : 10000, “tel” : “1598232123”, “mailbox” : “xing@qq.com”, “department” : “yanfa”, “sex” : “F”, “qq” : 736019646, “EmployedDates” : “2012-12-21T00:00:00.000+08:00” } } ] } } 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 实战代码 古诗文搜索引擎实战github地址:https://github.com/AngelaFighting/gushiwensearch

1、启动ES

Windows系统,在ES目录的bin目录中打开命令行窗口,输入命令:·elasticsearch.bat·,回车,如果看到ES集群显示started并且状态为Green,则说明启动成功

2、使用浏览器打开首页

在这里插入图片描述

输入要查询的内容,并选择搜索范围,点击搜索按钮 在这里插入图片描述 可看到匹配的结果数和各个结果的部分信息。

点击某篇诗文的链接,就可以查看诗文的详细信息了。 在这里插入图片描述

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