服务器启动时 Spring Boot 弹性搜索失败

Question

我们有一个使用 Spring Data 弹性搜索的 Spring Boot 应用程序。我们使用实体类来生成弹性索引。一个这样的类如下所示 -

import javax.persistence.Id;

import org.springframework.data.elasticsearch.annotations.Document;
import org.springframework.data.elasticsearch.annotations.Field;
import org.springframework.data.elasticsearch.annotations.FieldType;


/**
 * The Class ElasticSearchSampleEntity.
 */
@Document(indexName = "Sample-index", type = "Sample-content")
public class ElasticSearchSampleEntity {

    /** The es Sample entity id. */
    @Id
    @Field(type = FieldType.Long, index = true, name = "id")
    private Long esSampleEntityId;


    /** The es no of questions. */
    @Field(type = FieldType.Integer, index = true)
    private Integer esNoOfQuestions;

    /** The es total marks. */
    @Field(type = FieldType.Integer, index = true)
    private Integer esTotalMarks;

    /** The es total time min. */
    @Field(type = FieldType.Short, index = true)
    private Short esTotalTimeMin;

    /** The es total time sec. */
    @Field(type = FieldType.Short, index = true)
    private Short esTotalTimeSec;

    /** The es occurances. */
    @Field(type = FieldType.Integer, index = true)
    private Integer esOccurances;


    /** The es rating. */
    @Field(type = FieldType.Float, index = true)
    private Float esRating;


    /** The es created on. */
    @Field(type = FieldType.Long, index = true)
    private Long esCreatedDate;

    /** The es updated on. */
    @Field(type = FieldType.Long, index = true)
    private Long esUpdatedDate;

    /** The es published date. */
    @Field(type = FieldType.Long, index = true)
    private Long publishedDate;

    /** The sample type id. */
    @Field(type = FieldType.Integer, index = true)
    private Integer sampleTypeId;


    //getter and setter

}

这应该创建一次索引并将数据存储到弹性服务器。但是，在部署过程中，我们有时会遇到以下错误（间歇性问题）。

[main] ERROR o.s.boot.SpringApplication.reportFailure - Application run failed
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'sampleController': Unsatisfied dependency expressed through field 'esSampleService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'elasticSearchSampleServiceImpl': Unsatisfied dependency expressed through field 'esSampleRepo'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'elasticSearchSampleRepository': Invocation of init method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.elasticsearch.repository.support.SimpleElasticsearchRepository]: Constructor threw exception; nested exception is java.lang.IllegalArgumentException: mapper [sampleTypeId] cannot be changed from type [long] to [integer]

SampleTypeId 有时会被创建（或更新）为 Long，即使我们特别提到它为 Integer。这就是导致问题的原因。我在保存到弹性数据库时检查了数据类型，看起来还不错。这是否意味着弹性索引会随着每次部署而更新。对于数据库我们做spring.jpa.hibernate.ddl-auto=validate 同样对于弹性我们可以做同样的事情吗？我无法理解为什么会发生这个问题。映射似乎很好。请帮帮我。

Answer 1

错误日志中的以下 sn-p 很重要。

构造函数抛出异常；嵌套异常是 java.lang.IllegalArgumentException：映射器 [sampleTypeId] 不能 从类型 [long] 更改为 [integer]

看起来您之前创建了将sampleTypeId 定义为long 的索引，现在您将其更改为int，这是不可能的，因此从elasticsearch 引发了异常。

您可以从您的elasticsearch GET index mapping API 中确认，并在索引中检查您的sampleTypeId 的数据类型。