SpringBoot 整合 Elasticsearch

前言:由于项目需求,近期要用到Elasticsearch,故此仅以此随笔记下入门足

1. Elasticsearch

2. kibana 安装下载 (Kibana是一个为ElasticSearch 提供的数据分析的 Web 接口。可使用它对日志进行高效的搜索、可视化、分析等各种操作。)

#查看索引
GET locations/_search

#查看索引数据总数
GET /locations/_count

#统计总存储空间占用
GET /_cat/shards?v

#创建索引
PUT /{IndexName}?pretty
#索引取别名
PUT /{OldIndexName}/_alias/{NewIndexName}
#查看某个索引映射 GET locations
/_mapping # 查询所有索引信息 GET /_cat/indices?v #删除locations索引 DELETE /locations?pretty

 

3. springboot整合

  • 引入依赖
    <!--elasticsearch-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-elasticsearch</artifactId>
            <version>3.2.1.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.10</version>
        </dependency>
  • 添加配置
#elasticsearch配置
spring.data.cassandra.cluster-name=elasticsearch    //默认集群名称
spring.data.elasticsearch.cluster-nodes =127.0.0.1:9300   //默认启动集群节点

  • 实体类配置
@Data注释只是为了添加get和set方法
indexName 索引名称(理解为mysql数据库名) , type 索引类型名称(理解为表名)

听说: 索引文档实体 注意此时@Id注解的导入包来自import org.springframework.data.annotation.Id,索引名称必须为小写
@Data
@Document(indexName = "locations",type = "tbCidEntity")
public class TbCidEntity {
    @Id
    private String keyCid;
    @Field(type = FieldType.Text)
    private String   mcc;
    @Field(type = FieldType.Keyword)
    private String   pos;
    @Field(type = FieldType.Text,index = false)
    private String   remark;
    @Field(type = FieldType.Date, format = DateFormat.custom,pattern = "yyyy-MM-dd")
    @JsonFormat(shape = JsonFormat.Shape.STRING, pattern ="yyyy-MM-dd",timezone="GMT+8")
    private Date mdfTm;
    @Field(type = FieldType.Text,index = false)
    private String   mdfBy;
    @Field(type = FieldType.Date, format = DateFormat.custom,pattern = "yyyy-MM-dd")

}
  • elasticsearch资源库 继承了ElasticsearchRepository,封装了很多API(TbCid是索引文档实体,String是文档id类型)
@Component
public interface TBCidRepository extends ElasticsearchRepository <TbCid,String>{

    TbCid findByKeyCid(String keycid);

}
  • 工具类使用
   @Autowired
   private TBCidRepository tbCidRepository;

  //从es中根据cid查询tbcid public TbCid findByESCid(String cid){ BoolQueryBuilder builder = QueryBuilders.boolQuery(); MatchPhraseQueryBuilder cid1 = QueryBuilders.matchPhraseQuery("cid", cid); builder.must(cid1); Iterable<TbCid> search = tbCidRepository.search(builder); Iterator<TbCid> iterator = search.iterator(); if (iterator.hasNext()){ TbCid next = iterator.next(); return next; }else { return null; } }

//从es中根据keycid查询tbcid
public TbCid findByESKeyCid(String cid){

return tbCidRepository.findByKeyCid(cid);

}

//从将对象存入es
public void saveEntityToEs( TbCid cid){
tbCidRepository.save(cid);
}

 

4. 新增后在 kibana 的 Dev Tools 下 检查

GET /locations/tbCidEntity/_search 

查询结果:

{
"_index": "locations",
  
"_type": "tbCidEntity",
  
"_id": "1",
  "_score": 1,
  "_source": { ...} }

 

4. 总结

  • 好像es和springboot整合存在许多兼容问题,我这里是springboot2才兼容

 

5. linux 出现问题

 

  1. 问题 java.lang.UnsupportedOperationException: seccomp unavailable: CONFIG_SECCOMP not compiled into kernel, CONFIG_SECCOMP and CONFIG_SECCOMP_FILTER are needed

    解决办法:在所有节点的elasticsearch.yml配置文件中加入:

    bootstrap.memory_lock: false

    bootstrap.system_call_filter: false

  2. 问题:内存不够

    解决办法添加虚拟内存

 

  3. 问题:max number of threads [3818] for user [es] is too low, increase to at least [4096] 

    最大线程个数太低。修改配置文件/etc/security/limits.conf,增加配置,用户退出后重新登录生效

*        soft    nproc           4096
*        hard    nproc           4096 

   4. 问题:max file descriptors [4096] for elasticsearch process is too low, increase to at least [65536]

     修改/etc/security/limits.conf文件,增加配置,用户退出后重新登录生效

*               soft    nofile          65536
*               hard    nofile          65536

       注:3、4问题 为每个进程最大同时打开文件数太小,可通过下面2个命令查看当前数量

ulimit -Hn
ulimit -Sn

  5. 问题:max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]

    修改/etc/sysctl.conf文件,增加配置vm.max_map_count=262144

vi /etc/sysctl.conf
sysctl -p

    执行命令sysctl -p生效

  6. 问题:[1]: max number of threads [1024] for user [elasticsearch] is too low, increase to at least [2048]

    错误原因:启动检查未通过,  elasticsearch用户的最大线程数太低

    修改limits.d目录下的配置文件:vi /etc/security/limits.d/90-nproc.conf 为

*          soft    nproc     2048
root       soft    nproc     unlimited

    

6.后端启动

./elasticsearch -d

稍等片刻,再次访问地址,还是相同结果

此时,如果想关闭服务

[esuser@localhost bin]$ ps -ef|grep esuser
esuser     3318   3007  0 Feb01 pts/1    00:00:00 vi elasticsearch.yml
esuser     3856      1 21 01:15 pts/0    00:00:18 /usr/local/elasticsearch-7.5.1/jdk/bin/java -Des.networkaddress.cache.ttl=60 -Des.networkaddress.cache.negative.ttl=10 -XX:+AlwaysPreTouch -Xss1m -Djava.awt.headless=true -Dfile.encoding=UTF-8 -Djna.nosys=true -XX:-OmitStackTraceInFastThrow -Dio.netty.noUnsafe=true -Dio.netty.noKeySetOptimization=true -Dio.netty.recycler.maxCapacityPerThread=0 -Dio.netty.allocator.numDirectArenas=0 -Dlog4j.shutdownHookEnabled=false -Dlog4j2.disable.jmx=true -Djava.locale.providers=COMPAT -Xms128m -Xmx128m -XX:+UseConcMarkSweepGC -XX:CMSInitiatingOccupancyFraction=75 -XX:+UseCMSInitiatingOccupancyOnly -Djava.io.tmpdir=/tmp/elasticsearch-9874251960424438570 -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=data -XX:ErrorFile=logs/hs_err_pid%p.log -Xlog:gc*,gc+age=trace,safepoint:file=logs/gc.log:utctime,pid,tags:filecount=32,filesize=64m -XX:MaxDirectMemorySize=67108864 -Des.path.home=/usr/local/elasticsearch-7.5.1 -Des.path.conf=/usr/local/elasticsearch-7.5.1/config -Des.distribution.flavor=default -Des.distribution.type=tar -Des.bundled_jdk=true -cp /usr/local/elasticsearch-7.5.1/lib/* org.elasticsearch.bootstrap.Elasticsearch -d
esuser     3871   3856  0 01:15 pts/0    00:00:00 /usr/local/elasticsearch-7.5.1/modules/x-pack-ml/platform/linux-x86_64/bin/controller
esuser     3921   3521  0 01:16 pts/0    00:00:00 grep --color=auto elasticsearch
[esuser@localhost bin]$ jps
3856 Elasticsearch
3922 Jps
[esuser@localhost bin]$ kill 3856
[esuser@localhost bin]$ jps
3940 Jps
[esuser@localhost bin]$ 

 

    

 

 

-结束-

 

posted @ 2020-07-20 16:05  一个九  阅读(294)  评论(0编辑  收藏  举报