当我们在休眠中有依赖实体并尝试在 Vertica 中使用多个线程更新 table 时出现死锁

Question

我有两个java类。 Father.java and Children.java

    @Entity
    @Table(name = "FATHER")
    @JsonIgnoreProperties({ "hibernateLazyInitializer", "handler" })
    class Father implements Cloneable
    {
    @Id
    @Column(name = "father_id")
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long fatherId;
    
    @OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
    @JoinColumn(name = "father_id")
    @Fetch(value = FetchMode.SUBSELECT)
    private List<Children> children = new ArrayList<Children>();
    //getter and setters and public constructors 
    }


    @Entity
    @Table(name = "Children")
    class Children implements Comparable<Children>
    {

    @JsonIgnore
    @Id
    @Column(name = "children_id")
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private long child_id;

    @JsonIgnore
    @Column(name = "father_id")
    private long fatherId;
    //public constructors and getters and setters
    }

    public interface RelationDao{
    
    public Father update() throws Exception;
    
    }
    @Repository("relationDao")
    @EnableTransactionManagement
    @Transactional
    public RelationDaoImpl{
    @Override
    @Transactional("txManager")
    public Father update(Father father)
    {
    father = merge(father);
    //added retry logic as well also father is updated with a new child which is why merge
    }
    }

如果多个线程使用不同的行条目访问相同的 table（实体父）到更新，即使记录不同，我也会收到 Deadlock X 异常。

有什么方法可以解决为什么整个 table 被锁定而不是只有一行？即使我没有更新或添加任何代码，事务隔离级别是 SERIALIZABLE。

数据库系统是Vertica

Answer 1

解释到这里，如果有人来这里检查为什么Vertica不支持更新或删除的行级锁。

所以我使用synchronized来执行线程安全的更新和删除。

当我们在休眠中有依赖实体并尝试在 Vertica 中使用多个线程更新 table 时出现死锁

Deadlock when we we have dependent entities in hibernate and try to update table using multiple threads in Vertica

sql

hibernate

database-deadlocks

spring-data-jpa