SearchDomainUnknownHostException with ElastiCache about redisson HOT 19 CLOSED

After applying the settings, I confirmed that the error has not occurred for about three weeks

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config.setAddressResolverGroupFactory(new SequentialDnsAddressResolverFactory(1));

@namsic6460
at this line config.setAddressResolverGroupFactory(new SequentialDnsAddressResolverFactory(1));
i am getting an error, this new SequentialDnsAddressResolverFactory(1), where are you importing this from ? is there any library you added for this or created a class or what , because this new SequentialDnsAddressResolverFactory(1) is giving me not specified.

please Help!

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@musicallyvk Class is defined in redisson

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@musicallyvk

It's better to update version

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It happens due to network or DNS servers query amount limitations.

Did you try to define SequentialDnsAddressResolverFactory with concurrencyLevel = 1

Yaml config example:

singleServerConfig:
  address: "redis://xxx:xxx"
addressResolverGroupFactory: !<org.redisson.connection.SequentialDnsAddressResolverFactory> 1

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If the limit on DNS query counts is the issue, then this could be a fundamental solution.
I will try with the above settings and let you know!

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Hi,
thanks for replying again,

firstly it is using replicatedServersConfig .
secondly on AWS it is only using primary endpoint and reader endpoint ( it has 4 nodes with 1 primary and 3 replica, also i do not know if this info helps you ), Configuration endpoint
colum is empty on aws redis cache cluster.

so what do you suggest , what should i change.

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@musicallyvk

addressResolverGroupFactory setting is applied to all Redis configurations.

replicatedServersConfig:
  ...
addressResolverGroupFactory: !<org.redisson.connection.SequentialDnsAddressResolverFactory> 1

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value for addressResolverGroupFactory : will remain the same which is given below or do i have to change it according to my code ?

!<org.redisson.connection.SequentialDnsAddressResolverFactory> 1

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yes, just define addressResolverGroupFactory as I suggested

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Hey @mrniko

Hope You are having a good time,
just wanted to ask , i am using .properties file , and i am not sure if it will take 1 as a value,

my .properties file will look like below
"addressResolverGroupFactory" : "!<org.redisson.connection.SequentialDnsAddressResolverFactory>"

what to do with this 1.

will this cause any error issue, or is it fine if i write 1 also inside inverted commas in the value part ?

thanks a Ton!

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@musicallyvk

Hi. Redisson doesn't support properties file. Yaml only

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@musicallyvk Below is a part of my code. After applying this setting, the error mentioned occurred only once in about two months. I hope this helps.

private final RedisProperties redisProperties;

@Bean
public RedissonClient redissonClient() {
    String prefix = "redis";
    if (BooleanUtils.isTrue(this.redisProperties.getSsl())) {
        prefix += "s";
    }

    Config config = new Config();
    config.setAddressResolverGroupFactory(new SequentialDnsAddressResolverFactory(1));
    config.useSingleServer()
        .setAddress(prefix + "://" + this.redisProperties.getHost() + ":" + this.redisProperties.getPort())
        .setPassword(this.redisProperties.getPassword())
        .setDatabase(this.redisProperties.getDatabase());

    return Redisson.create(config);
}

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@musicallyvk

Hi. Redisson doesn't support properties file. Yaml only

as per your reply, my project is using .properties files only for redission, and it is working

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@musicallyvk Below is a part of my code. After applying this setting, the error mentioned occurred only once in about two months. I hope this helps.

private final RedisProperties redisProperties;

@Bean
public RedissonClient redissonClient() {
    String prefix = "redis";
    if (BooleanUtils.isTrue(this.redisProperties.getSsl())) {
        prefix += "s";
    }

    Config config = new Config();
    config.setAddressResolverGroupFactory(new SequentialDnsAddressResolverFactory(1));
    config.useSingleServer()
        .setAddress(prefix + "://" + this.redisProperties.getHost() + ":" + this.redisProperties.getPort())
        .setPassword(this.redisProperties.getPassword())
        .setDatabase(this.redisProperties.getDatabase());

    return Redisson.create(config);
}

Hi @namsic6460 Thank You Very Much For Replying . i am using replicated server config and also i am using .properties file and yaml both files are there, i do not understand because @mrniko said that redission only uses yaml.
I am very new to this , can you please help @namsic6460 as it is already working for you.
also i need the config or yaml file of yours if you dont mind please.
or else i have already shared my config file above somewhere already, please check that what is wrong in this.

thak you very much

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@musicallyvk
I did not use .yml or .properties files for these settings. The code I posted is all there is, and it is configured through a bean.

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Hi @namsic6460 Thanks Man, i think My Redisson version does not have this class

so do i need to update redisson or can i add something else here like DnsAddressResolverGroupFactory or RoundRobinDnsAddressResolverGroupFactory

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SequentialDnsAddressResolverFactory

shall i change it to the latest version which is 3.30.0. or to some specific version,
i am little afraid because my project is so huge , i wonder if it impacts any other stuff.

but still what version would be better guys?

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@musicallyvk
It is generally advisable to use the latest version. Of course, there will be many changes to review, but the initial verification is the responsibility of the developers of this project, and the final verification is up to you. Since it's open-source project

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