node.jsamazon-web-servicesredisamazon-elasticache

ioredis - ClusterAllFailedError: Failed to refresh slots cache

I'm dealing with a ClusterAllFailedError: Failed to refresh slots cache. issue from ioredis and Elasticache. This is my clustering config 

const clusterOptions = {
    enableReadyCheck: true,
    retryDelayOnClusterDown: 300,
    retryDelayOnFailover: 1000,
    retryDelayOnTryAgain: 3000,
    slotsRefreshTimeout: 200000000000000,
    clusterRetryStrategy: (times) => Math.min(times * 1000, 10000),
    dnsLookup: (address, callback) => callback(null, address),
    scaleReads: 'slave',
    showFriendlyErrorStack: true,
    redisOptions: {
        keyPrefix: config.queue.prefix,
        autoResubscribe: true,
        autoResendUnfulfilledCommands: true
    }
}

const redisClientInstance = new Redis.Cluster([{ host: '', port: ''}], clusterOptions);

But trying to access the Redis always results in a Failed refresh slots cache. Anyone else dealt with this issue?

Thank you.

Solution

  • The following works for me.

    Redis version: 5.0.4 on AWS ElastiCache Clustered with TLS and AUTH enabled.

    ioredis version: 4.16.0

    Code to connect:

    const redis = new Redis.Cluster(
            [{ "host": <ELASTI_CACHE_CONFIGURATION_ENDPOINT> }], {
                dnsLookup: (address, callback) => callback(null, address),
                redisOptions: {
                    tls: true,
                    password: <ELASTI_CACHE_REDIS_AUTH>
                }
            });

    When you launch ElastiCache, you will need to specify one or more Subnet Group (generally private Subnets) and the Security Group. When you run the above code from any compute (Lambda, EC2 etc.), you need to ensure the following