EclipseLink批量插入非常慢

Question

我正在尝试使用EclipseLink优化我的JPA实现.我已经添加了批处理操作.但它仍然花了很多时间做50 000次插入.使用原始SQL和JDBC完成相同的插入所需的时间大约是10倍.

为了确保批处理操作实际上正在工作,我使用Wireshark检查我的数据包并且它没有使用批量插入.

这是插入数据包之一:

它没有做:

INSERT INTO ENTITYCLASSTEST (LASTNAME, NAME) VALUES ('sfirosijfhgdoi 0', 'dsufius0'), ('sfirosijfhgdoi 0', 'dsufius0'), ('sfirosijfhgdoi 0', 'dsufius0'), ('sfirosijfhgdoi 0', 'dsufius0')... and so on

我期待它如上所述,但它每个数据包插入一行而不是每个数据包多行.

这是我的实体类:

@Entity
public class EntityClassTest implements Serializable {
    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    private String name;
    private String lastname;

    public EntityClassTest() {
    }

    public EntityClassTest(Long id, String name, String lastname) {
        this.id = id;
        this.name = name;
        this.lastname = lastname;
    }

    public EntityClassTest(String name, String lastname) {
        this.name = name;
        this.lastname = lastname;
    }

    public Long getId() {
        return id;
    }

    public String getName() {
        return name;
    }

    public String getLastName() {
        return lastname;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public void setName(String name) {
        this.name = name;
    }

    public void setLastName(String lastname) {
        this.lastname = lastname;
    }

    @Override
    public int hashCode() {
        int hash = 0;
        hash += (id != null ? id.hashCode() : 0);
        return hash;
    }

    @Override
    public boolean equals(Object object) {
        // TODO: Warning - this method won't work in the case the id fields are not set
        if (!(object instanceof EntityClassTest)) {
            return false;
        }
        EntityClassTest other = (EntityClassTest) object;
        if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
            return false;
        }
        return true;
    }

    @Override
    public String toString() {
        return "database.EntityClassTest [id=" + id + " ]";
    }

}

这是我的持久化方法,它接收List并保留内部的所有对象.

public void insertListToTable(final String persistenceUnit, final List list) throws SQLException {
        final EntityManagerFactory entityManagerFactory = Persistence.createEntityManagerFactory(persistenceUnit);
        final EntityManager entityManager = entityManagerFactory.createEntityManager();
        final EntityTransaction transaction = entityManager.getTransaction();

        try {            
            final int listSize = list.size();
            transaction.begin();

            for (int i = 0; i<listSize; i++) { //Object object : list) {
                final Object object = list.get(i);
                entityManager.persist(object);

                if ( i % 500 == 0 ) { //500, same as the JDBC batch size defined in the persistence.xml
                    //flush a batch of inserts and release memory:
                    entityManager.flush();
                    entityManager.clear();
                }
            }
            transaction.commit();
        }
        catch(Exception e) {
            if (transaction != null) {
                transaction.rollback();
            }
            throw new SQLException(e.getMessage());
        } 
        finally {
            entityManager.close();
        }
    }

而我persistence.xml,我将500设置为批量值,文件是:

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
<persistence-unit name="ExternalServer" transaction-type="RESOURCE_LOCAL">
    <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
    <!-- List of Entity classes -->
    <class>model.EntityClassTest</class>
    <properties>
      <property name="javax.persistence.jdbc.url" value="jdbc:mysql://myServer:3306/testdb?zeroDateTimeBehavior=convertToNull"/>
      <property name="javax.persistence.jdbc.user" value="testdbuser"/>
      <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
      <property name="javax.persistence.jdbc.password" value="myPassword"/>
      <property name="javax.persistence.schema-generation.database.action" value="create"/>

      <!-- Weaving -->
      <property name="eclipselink.weaving" value="static"/>
      <!-- SQL dialect / Database type -->
      <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>
      <property name="eclipselink.target-database" value="MySQL"/>
      <!-- Tell the JPA provider to, by default, create the table if it does not exist. -->
      <property name="javax.persistence.schema-generation.database.action" value="create"/>
      <!-- No logging (For development change the value to "FINE") -->
      <property name="eclipselink.logging.level" value="OFF"/>
      <!-- Enable batch writing -->
      <property name="eclipselink.jdbc.batch-writing" value="JDBC"/>
      <!-- Batch size -->
      <property name="eclipselink.jdbc.batch-writing.size" value="500"/>

    </properties>
  </persistence-unit>
</persistence>

所以我的问题是,为什么不批量插入？我相信我已经完成了EclipseLink的配置,这是我在EclipseLink网站上阅读的内容,也是SO.

////////////////////////////编辑///////////////////// /////

正如Chris的回答所示,我EntityClassTest将此值更改@GeneratedValue(strategy = GenerationType.IDENTITY)为@GeneratedValue(strategy = GenerationType.SEQUENCE)并重新运行测试,并且数据包将像以前一样发送(就像我上面发布的图像一样).所以它不能解决我的问题,我害怕.

////////////////////////////编辑2 //////////////////// ////

我已将persistence.xml文件中的日志记录级别更改FINEST为如下所示.

<property name="eclipselink.logging.level" value="FINEST"/>

这是生成的日志.我把它放在一个pastebin中,因为它很长.

http://pastebin.com/rKihCKMW

它好像在呼唤Execute query InsertObjectQuery很多次.

////////////////////////////编辑3 //////////////////// ////

这是我正在使用的每个组件的版本.

+-------------------------+------------------------------+
| Variable_name           | Value                        |
+-------------------------+------------------------------+
| innodb_version          | 5.6.12                       |
| protocol_version        | 10                           |
| slave_type_conversions  |                              |
| version                 | 5.6.12-log                   |
| version_comment         | MySQL Community Server (GPL) |
| version_compile_machine | x86_64                       |
| version_compile_os      | Win64                        |
+-------------------------+------------------------------+

Netbeans 8.0

EclipseLink (JPA 2.1)

mysql-connector-java-5.1.24.jar

////////////////////////////编辑4 //////////////////// ////

按照CuriousMind的回答,我将我的EntityClassTestid注释编辑为:

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO, generator="id-seq-gen")
    @SequenceGenerator( name="id-seq-gen", sequenceName="ID_SEQ_GEN", allocationSize=500 )
    private Long id;

但它没有解决我的问题,我仍然每个数据包只有一个插入(如上图所示)和EclipseLink我得到的日志:

[EL Fine]: sql: 2014-10-19 06:44:02.608--ClientSession(824177287)--Connection(1674390738)--Thread(Thread[main,5,main])--SELECT LAST_INSERT_ID()
[EL Finest]: sequencing: 2014-10-19 06:44:02.608--UnitOfWork(1985011414)--Thread(Thread[main,5,main])--assign sequence to the object (1.251 -> database.EntityClassTest [id=null ])
[EL Finest]: query: 2014-10-19 06:44:02.608--UnitOfWork(1985011414)--Thread(Thread[main,5,main])--Execute query InsertObjectQuery(database.EntityClassTest [id=null ])
[EL Finest]: query: 2014-10-19 06:44:02.608--ClientSession(824177287)--Thread(Thread[main,5,main])--Execute query ValueReadQuery(name="ID_SEQ_GEN" sql="SELECT LAST_INSERT_ID()")
[EL Fine]: sql: 2014-10-19 06:44:02.608--ClientSession(824177287)--Connection(1674390738)--Thread(Thread[main,5,main])--INSERT INTO ENTITYCLASSTEST (LASTNAME, NAME) VALUES (?, ?)
    bind => [sfirosijfhgdoi 2068, dsufius1034]
[EL Fine]: sql: 2014-10-19 06:44:02.608--ClientSession(824177287)--Connection(1674390738)--Thread(Thread[main,5,main])--SELECT LAST_INSERT_ID()
[EL Finest]: sequencing: 2014-10-19 06:44:02.608--UnitOfWork(1985011414)--Thread(Thread[main,5,main])--assign sequence to the object (1.252 -> database.EntityClassTest [id=null ])
[EL Finest]: query: 2014-10-19 06:44:02.608--UnitOfWork(1985011414)--Thread(Thread[main,5,main])--Execute query InsertObjectQuery(database.EntityClassTest [id=null ])
[EL Finest]: query: 2014-10-19 06:44:02.608--ClientSession(824177287)--Thread(Thread[main,5,main])--Execute query ValueReadQuery(name="ID_SEQ_GEN" sql="SELECT LAST_INSERT_ID()")
[EL Fine]: sql: 2014-10-19 06:44:02.608--ClientSession(824177287)--Connection(1674390738)--Thread(Thread[main,5,main])--INSERT INTO ENTITYCLASSTEST (LASTNAME, NAME) VALUES (?, ?)
    bind => [sfirosijfhgdoi 2244, dsufius1122]

等等...

Answer 1

您正在使用 GenerationType.IDENTITY 进行排序，这需要从每个插入语句中一一检索 ID。尝试允许以 500 为一组进行预分配的排序方案，您会看到改进：http : //en.wikibooks.org/wiki/Java_Persistence/Identity_and_Sequencing#Identity_sequencing