SpringBoot整合elasticsearch(三)

Docker安装elasticsearch

启动注意2点，1是内存，2是线程数（此处进行简单安装，后面会详细补充es文档）

 [root@topcheer ~]# docker images
 REPOSITORY                TAG                 IMAGE ID            CREATED             SIZE
 elasticsearch             latest              874179f19603        12 days ago         771 MB
 springbootdemo4docker     latest              cd13bc7f56a0        2 weeks ago         678 MB
 docker.io/tomcat          latest              ee48881b3e82        4 weeks ago         506 MB
 docker.io/rabbitmq        latest              a00bc560660a        4 weeks ago         147 MB
 docker.io/centos          latest              67fa590cfc1c        7 weeks ago         202 MB
 docker.io/redis           latest              f7302e4ab3a8        8 weeks ago         98.2 MB
 docker.io/rabbitmq        3.7.16-management   3f92e6354d11        2 months ago        177 MB
 docker.io/elasticsearch   6.8.0               d0b291d7093b        4 months ago        895 MB
 docker.io/hello-world     latest              fce289e99eb9        9 months ago        1.84 kB
 docker.io/java            8                   d23bdf5b1b1b        2 years ago         643 MB
 [root@topcheer ~]# docker run -e ES_JAVA_OPTS="-Xms256m -Xmx256m" -d -p 9200:9200 -p 9300:9300 --name myES d0b291d7093b
 5c4e5ffac1630f57260f739d200050535daf3ab10b1256441400a04fef70434b
 [root@topcheer ~]# docker ps -l
 CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                                            NAMES
 5c4e5ffac163        d0b291d7093b        "/usr/local/bin/do..."   6 seconds ago       Up 5 seconds        0.0.0.0:9200->9200/tcp, 0.0.0.0:9300->9300/tcp   myES
 [root@topcheer ~]# docker ps -l
 CONTAINER ID        IMAGE               COMMAND                  CREATED              STATUS                       PORTS               NAMES
 5c4e5ffac163        d0b291d7093b        "/usr/local/bin/do..."   About a minute ago   Exited (78) 34 seconds ago                       myES
 [root@topcheer ~]# docker logs -tf --tail 200 5c4e5ffac163
 2019-10-11T15:33:21.335717000Z OpenJDK 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 and will likely be removed in a future release.

​

发现ES容器停止了

 2019-10-11T15:34:04.379276000Z [2019-10-11T15:34:04,372][INFO ][o.e.t.TransportService   ] [om43m7F] publish_address {172.17.0.4:9300}, bound_addresses {[::]:9300}
 2019-10-11T15:34:04.432432000Z [2019-10-11T15:34:04,393][INFO ][o.e.b.BootstrapChecks    ] [om43m7F] bound or publishing to a non-loopback address, enforcing bootstrap checks
 2019-10-11T15:34:04.441501000Z ERROR: [1] bootstrap checks failed
 2019-10-11T15:34:04.441844000Z [1]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
 2019-10-11T15:34:04.497725000Z [2019-10-11T15:34:04,454][INFO ][o.e.n.Node               ] [om43m7F] stopping ...
 2019-10-11T15:34:04.559075000Z [2019-10-11T15:34:04,557][INFO ][o.e.n.Node               ] [om43m7F] stopped
 2019-10-11T15:34:04.559461000Z [2019-10-11T15:34:04,557][INFO ][o.e.n.Node               ] [om43m7F] closing ...
 2019-10-11T15:34:04.580693000Z [2019-10-11T15:34:04,577][INFO ][o.e.n.Node               ] [om43m7F] closed
 2019-10-11T15:34:04.584525000Z [2019-10-11T15:34:04,581][INFO ][o.e.x.m.p.NativeController] [om43m7F] Native controller process has stopped - no new native processes can be started

解决：

在宿主机执行：

sysctl -w vm.max_map_count=262144

原因：

vm.max_map_count参数，是允许一个进程在VMAs拥有最大数量（VMA：虚拟内存地址， 一个连续的虚拟地址空间），当进程占用内存超过时， 直接OOM。

elasticsearch占用内存较高。官方要求max_map_count需要配置到最小262144。

重新启动:

http://192.168.180.113:9200/_cat/health?v
epoch      timestamp cluster        status node.total node.data shards pri relo init unassign pending_tasks max_task_wait_time active_shards_percent
1570808429 15:40:29  docker-cluster green           1         1      0   0    0    0        0             0                  -                100.0%

Springboot整合

pom.xml

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
        </dependency>

配置文件

 spring
     data:
     elasticsearch:
       cluster-nodes: 192.168.180.113:9300
       cluster-name: docker-cluster

启动类(采用第二种)

 /**
  * SpringBoot默认支持两种技术来和ES交互；
  * 1、Jest（默认不生效）
  *  需要导入jest的工具包（io.searchbox.client.JestClient）
  * 2、SpringData ElasticSearch【ES版本有可能不合适】
  *      版本适配说明：https://github.com/spring-projects/spring-data-elasticsearch
  *      如果版本不适配：2.4.6
  *          1）、升级SpringBoot版本
  *          2）、安装对应版本的ES
  *
  *      1）、Client 节点信息clusterNodes；clusterName
  *      2）、ElasticsearchTemplate 操作es
  *      3）、编写一个 ElasticsearchRepository 的子接口来操作ES；
  *  两种用法：https://github.com/spring-projects/spring-data-elasticsearch
  *  1）、编写一个 ElasticsearchRepository
  */
 @SpringBootApplication
 public class Springboot03ElasticApplication {
 ​
     public static void main(String[] args) {
         SpringApplication.run(Springboot03ElasticApplication.class, args);
     }
 }

发现启动项目报错：

nested exception is java.lang.IllegalStateException: availableProcessors is already set to [4], rejecting [4]

我网上查询了一下，有人是是因为整合了Redis的原因。但是我把Redis相关的配置去掉后，问题还是没有解决，最后有人说是因为netty冲突的问题。 也有人给出了解决方式就是在项目初始化钱设置一下一个属性。在初始化之前加上System.setProperty("es.set.netty.runtime.available.processors", "false");

 @Configuration
 public class ElasticSearchConfig {
     @PostConstruct
     void init() {
         System.setProperty("es.set.netty.runtime.available.processors", "false");
     }
 }

Bo类

 @Document(indexName = "topcheer",type = "book" )
 @Slf4j
 @Data
 @Builder
 public class Book implements Serializable {
 ​
     private Integer id;
     private String name;
     private String author;
 ​
     public Book(String name, String author) {
         this.name = name;
         this.author = author;
     }
 ​
     public Book(Integer id, String name, String author) {
         this.id = id;
         this.name = name;
         this.author = author;
     }
 ​
     public Book() {
     }
 }

Repository类

 public interface BookRepository extends ElasticsearchRepository<Book,Integer> {
 ​
     //参照
     // https://docs.spring.io/spring-data/elasticsearch/docs/3.0.6.RELEASE/reference/html/
    public List<Book> findByNameLike(String name);
 ​
 }

测试类：

 @Autowired
     BookRepository bookRepository;
 ​
     @Test
     public void test02() {
         Book book = new Book();
         book.setId(1);
         book.setName("西游记");
         book.setAuthor("吴承恩");
         bookRepository.index(book);
 ​
 ​
         for (Book book1 : bookRepository.findByNameLike("游")) {
             System.out.println(book1);
         };
 ​
     }

结果：

 2019-10-12 00:27:03.827  INFO --- [           main] Oss6ApplicationTests : Started Oss6ApplicationTests in 17.532 seconds (JVM running for 19.428)
 2019-10-12 00:27:03.829 DEBUG --- [           main] ls.restart.Restarter : Creating new Restarter for thread Thread[main,5,main]
 Book(id=1, name=西游记, author=吴承恩)
 2019-10-12 00:27:04.851 DEBUG --- [       Thread-3] ebApplicationContext : Closing org.springframework.web.context.support.GenericWebApplicationContext@20f5281c, started on Sat Oct 12 00:26:47 CST 2019
 2019-10-12 00:27:04.859  INFO --- [       Thread-3] ageListenerContainer : Waiting for workers to finish.
 http://192.168.180.113:9200/topcheer/book/_search
 {"took":7,"timed_out":false,"_shards":{"total":5,"successful":5,"skipped":0,"failed":0},"hits":{"total":1,"max_score":1.0,"hits":[{"_index":"topcheer","_type":"book","_id":"1","_score":1.0,"_source":{"id":1,"name":"西游记","author":"吴承恩"}}]}}