1、介绍
对mysql、oracle等数据库数据进行同步到ES有三种做法:一个是通过elasticsearch提供的API进行增删改查,一个就是通过中间件进行数据全量、增量的数据同步,另一个是通过收集日志进行同步。
明显通过API增上改查比较麻烦,这里介绍的是利用中间件进行数据同步。
2、常用的同步中间件的介绍和对比
(1)elasticsearch-jdbc独立的第三方工具 (2)elasticsearch-river-mysql (3)go-mysql-elasticsearch(国内)
都可以完成数据同步;
elasticsearch-jdbc更通用,GitHub活跃度很高;
elasticsearch-river-mysql 自2013年后便不再更新;
go-mysql-elasticsearch仍处理开发不稳定阶段;
elasticsearch-river-jdbc和elasticsearch-river-mysql都不支持对删掉的数据进行同步,go-mysql-elasticsearch希望可以改善这个问题。
总的来说,elasticsearch-jdbc更适合使用,对于删掉的数据可以采用API进行同步,或者在数据中不进行物理删除可以避免该问题的出现。
3、elasticsearch的安装
这里使用的是2.3.2版本,可以到官方网站下载,这里不提供官方地址,或者访问 下载本篇文章所用到的两个安装包。
得到 elasticsearch-2.3.2.tar.gz
[zsz@zsz ~]$ tar -zxvf elasticsearch-2.3.2.tar.gz
[zsz@zsz ~]$ mv elasticsearch-2.3.2 /usr/local/elasticsearch-2.3.2
启动elasticsearch服务
[zsz@zsz ~]$./bin/elasticsearch
另外,bin/elasticsearch -d(后台运行);
如何需要修改配置,可以查看/elasticsearch-2.3.2/config/elasticsearch.yml;
查看节点情况:
[zsz@zsz downloads]$ curl 'localhost:9200/_cat/nodes?v' host ip heap.percent ram.percent load node.role master name 127.0.0.1 127.0.0.1 12 79 0.18 d * node-1
查看索引,当前为无索引:
[zsz@zsz downloads]$ curl 'localhost:9200/_cat/indices?v' health status index pri rep docs.count docs.deleted store.size pri.store.size
创建索引:
[zsz@zsz downloads]$ curl -XPUT 'localhost:9200/customer?pretty' { "acknowledged" : true }
[zsz@zsz downloads]$ curl 'localhost:9200/_cat/indices?v' health status index pri rep docs.count docs.deleted store.size pri.store.size yellow open customer 5 1 0 0 650b 650b
增加索引并搜索:
[zsz@zsz downloads]$ curl -XPUT 'localhost:9200/customer/external/1?pretty' -d ' > { > "name": "John Doe" > }' { "_index" : "customer", "_type" : "external", "_id" : "1", "_version" : 1, "_shards" : { "total" : 2, "successful" : 1, "failed" : 0 }, "created" : true }
可以看到,一个新的文档在customer索引和external类型中被成功创建。文档也有一个内部id 1, 这个id是在增加索引的时候指定的。下面来检索这个记录:
[zsz@zsz downloads]$ curl -XGET 'localhost:9200/customer/external/1?pretty' { "_index" : "customer", "_type" : "external", "_id" : "1", "_version" : 1, "found" : true, "_source" : { "name" : "John Doe" } }
[zsz@zsz downloads]$ curl 'localhost:9200/customer/_search?q=John' {"took":2,"timed_out":false,"_shards":{"total":5,"successful":5,"failed":0},"hits":{"total":1,"max_score":0.19178301,"hits":[{"_index":"customer","_type":"external","_id":"1","_score":0.19178301,"_source": { "name": "John Doe" }}]}}
更新这个索引:
[zsz@zsz downloads]$ curl -XPOST 'localhost:9200/customer/external/1/_update?pretty' -d ' > { > "doc": { "name": "Jane Doe Haha" } > }' { "_index" : "customer", "_type" : "external", "_id" : "1", "_version" : 2, "_shards" : { "total" : 2, "successful" : 1, "failed" : 0 } }
[zsz@zsz downloads]$ curl -XGET 'localhost:9200/customer/external/1?pretty' { "_index" : "customer", "_type" : "external", "_id" : "1", "_version" : 2, "found" : true, "_source" : { "name" : "Jane Doe Haha" } }
删除该索引:
[zsz@zsz downloads]$ curl -XDELETE 'localhost:9200/customer/external/1?pretty' { "found" : true, "_index" : "customer", "_type" : "external", "_id" : "1", "_version" : 3, "_shards" : { "total" : 2, "successful" : 1, "failed" : 0 } } [zsz@zsz downloads]$ curl -XGET 'localhost:9200/customer/external/1?pretty' { "_index" : "customer", "_type" : "external", "_id" : "1", "found" : false }
ES必要的插件 必要的Head、kibana、IK(中文分词)、graph等插件的详细安装和使用。
ES对外接口 JAVA API接口 http://www.ibm.com/developerworks/library/j-use-elasticsearch-java-apps/index.html RESTful API接口 常见的增、删、改、查操作实现:
ES遇到常见问题 ,
3、elasticsearch-jdbc的安装配置
需要的安装包: elasticsearch-jdbc-2.3.2.0-dist.zip,它是与elasticsearch-2.3.2.tar.gz相对应的,其他版本会出错。
下载地址:
[zsz@zsz downloads]$ vi /etc/profile
#增加elasticsearch-jdbc插件的环境变量
export JDBC_IMPORTER_HOME=/home/downloads/elasticsearch-jdbc-2.3.2.0
[zsz@zsz downloads]$ source /etc/profile
创建同步:
[zsz@zsz downloads]$ mkdir /odbc_es
[zsz@zsz downloads]$ cd /odbc_es
[zsz@zsz odbc_es]$ vi mysql_import_es.sh
#!/bin/shbin=$JDBC_IMPORTER_HOME/binlib=$JDBC_IMPORTER_HOME/libecho '{"type" : "jdbc","jdbc": {"elasticsearch.autodiscover":true,"elasticsearch.cluster":"elasticsearch",##需要与/elasticsearch-2.3.2/config/elasticsearch.yml的配置对应"url":"jdbc:mysql://***:3306/**","user":"**","password":"**","sql":"select * from news","elasticsearch" : {"host" : "127.0.0.1","port" : 9300},"index" : "myindex","type" : "mytype"}}'| java \-cp "${lib}/*" \-Dlog4j.configurationFile=${bin}/log4j2.xml \org.xbib.tools.Runner \org.xbib.tools.JDBCImporter##根据个人项目情况填写以上的地址
运行数据同步脚本mysql_import_es.sh:
[zsz@zsz odbc_es]$ ./mysql_import_es.sh
查看是否同步成功:
[zsz@zsz odbc_es]$ curl 'localhost:9200/_cat/indices?v' health status index pri rep docs.count docs.deleted store.size pri.store.size yellow open myindex 5 1 163 0 146.5kb 146.5kb yellow open customer 5 1 0 0 795b 795b
[zsz@zsz odbc_es]$ curl -XGET 'http://127.0.0.1:9200/myindex/mytype/_search?pretty' { "took" : 9, "timed_out" : false, "_shards" : { "total" : 5, "successful" : 5, "failed" : 0 }
......
说明同步数据成功。
问题与解决:
1、提示no cluster nodes available, check settings
解决:请查看/elasticsearch-2.3.2/config/elasticsearch.yml。一般都是该文件配置错误造成的,比如单机模式的,配置了node节点,或者cluster.name错误。
有问题请与我联系。
原文地址:http://www.cnblogs.com/zhongshengzhen/p/elasticsearch_mysql.html