CODEWITHSUNDEEP
javaspringspring-bootredisspring-data-redis
D.Tomov
D.Tomov

Reputation: 1158

Redis still returns null entries even when they are expired

I am using Spring Repositories with Redis and want to store data about user for 10 seconds and expire them (and delete them) from redis. I know expiring and deleting is different, but is there an easy way to delete them like I am expiring them automatically.

I have the following entity

@RedisHash(value = "User", timeToLive = 10)
public class User {
    @Id
    private String id;
    @Indexed
    @ApiModelProperty(notes = "First name of the user")
    private String firstName;
    @ApiModelProperty(notes = "Last name of the user")
    private String lastName;

    ...
    ...
}

Repository

@Repository
public interface UserRepository extends CrudRepository<User, String> {
}

Configuration for Redis

@Configuration
public class RedisConfig {

    @Value("${redis.hostname}")
    private String redisHostname;
    @Value("${redis.port}")
    private int redisPort;

    @Bean
    public JedisConnectionFactory jedisConnectionFactory() {
        RedisStandaloneConfiguration redisStandaloneConfiguration = new RedisStandaloneConfiguration(redisHostname, redisPort);
        return new JedisConnectionFactory(redisStandaloneConfiguration);
    }

    @Bean
    public RedisTemplate<String, Object> redisTemplate() {
        RedisTemplate<String, Object> template = new RedisTemplate<>();
        template.setConnectionFactory(jedisConnectionFactory());
        return template;
    }
}

When I get all the entities with findAll method from the repository if they are expired I get a bunch of null values, and I can see that they are in the redis with a redis client. I am worried that this will fill the db with a lot of expired data. Is there a way to delete the expired entities.

Upvotes: 1

Views: 5058

Answers (2)

Lars
Lars

Reputation: 776

The short answer is:

Put the following annotation:

@EnableRedisRepositories(enableKeyspaceEvents = EnableKeyspaceEvents.ON_STARTUP)

Above your main class (SpringBootApplication)

Objects will now get removed from the redis store :)

Upvotes: 2

0xTang
0xTang

Reputation: 886

When the expiration is set to a positive value, the corresponding EXPIRE command is executed. In addition to persisting the original, a phantom copy is persisted in Redis and set to expire five minutes after the original one.

for more information, please reference here

Hope this post helps you.

Upvotes: 1

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