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🗄️ Databases

All of a sudden, I'm receiving this error

Freshabout 21 hours ago
Mar 14, 20260 views
Confidence Score55%
55%

Problem

[code block] I have a 6 nodes setup, I saw this in the log of a node: [code block] I think ioredis is not recovering well alongside the redis cluster(3.2)

Error Output

Error: Too many Cluster redirections. Last error: ReplyError: MOVED 6686 10.240.100.31:7000]

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1 Fix

Canonical Fix
Unverified Fix
New Fix – Awaiting Verification

Increase Cluster Redirection Limit in ioredis Configuration

Medium Risk

The error 'Too many Cluster redirections' indicates that the ioredis client is encountering excessive redirection responses from the Redis cluster. This typically occurs when the client is trying to access a key that has been moved to a different node in the cluster, but is not handling the redirection properly. The default redirection limit may be too low for your workload, especially if there are frequent key migrations or if the cluster is under heavy load.

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  1. 1

    Update ioredis Configuration

    Modify the ioredis client configuration to increase the maximum number of allowed redirections. This can help the client recover from transient issues more effectively.

    javascript
    const Redis = require('ioredis');
const redis = new Redis({
  clusterRetryStrategy: (times) => {
    return Math.min(times * 100, 3000);
  },
  maxRedirections: 20 // Increase this value as needed
});
  2. 2

    Monitor Redis Cluster Health

    Check the health of your Redis cluster to ensure that all nodes are operational and there are no network issues causing excessive redirections. Use the 'CLUSTER INFO' command to gather insights.

    javascript
    redis.cluster('info').then(console.log).catch(console.error);
  3. 3

    Review Key Distribution

    Analyze the key distribution across your Redis nodes to ensure that keys are evenly distributed. Uneven distribution can lead to hotspots and increased redirection. Use the 'CLUSTER KEYSLOT' command to check key slots.

    javascript
    const slot = redis.cluster('keyslot', 'your-key');
console.log(slot);
  4. 4

    Test Application Load

    Simulate application load to verify that the changes to the ioredis configuration effectively reduce the number of redirection errors. Monitor logs for any remaining errors.

    javascript
    for (let i = 0; i < 1000; i++) {
  redis.get('your-key').then(console.log).catch(console.error);
}

Validation

Confirm that the number of redirection errors in the logs has decreased significantly after implementing the changes. Additionally, monitor application performance to ensure that key retrievals are successful without excessive delays.

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Environment

Submitted by

AC

Alex Chen

2450 rep

Tags

redisiorediscache