Magento2 don't work with redis in cluster mode

[ByJacob]

Preconditions (*)

1. Magento 2.4.3
2. Redis 6 configured in cluster mode (or use AWS ElastiCache in cluster mode with 3 masters)

Steps to reproduce (*)

1. Run magento
2. Configure redis config and cache (redis is configured in cluster mode)

Expected result (*)

1. All ./bin/magento comands works correct and return status code 0
2. Cache in redis works

Actual result (*)

1. magento command returns status code 1 with error text, example MOVED 2482 122[IP:PORT]
2. Cache don't work

---

Please provide Severity assessment for the Issue as Reporter. This information will help during Confirmation and Issue triage processes.

• Severity: S0 - Affects critical data or functionality and leaves users without workaround.
• Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
• Severity: S2 - Affects non-critical data or functionality and forces users to employ a workaround.
• Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• Severity: S4 - Affects aesthetics, professional look and feel, “quality” or “usability”.

[m2-assistant]

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[m2-assistant]

Hi @engcom-Delta. Thank you for working on this issue.
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[magenx]

this page explain everything

https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/Replication.Redis-RedisCluster.html

https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/GettingStarted.ConnectToCacheNode.html

[m2-assistant]

Hi @engcom-Hotel. Thank you for working on this issue.
In order to make sure that issue has enough information and ready for development, please read and check the following instruction: 👇

• 1. Verify that issue has all the required information. (Preconditions, Steps to reproduce, Expected result, Actual result).

  Details

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• 2. Verify that issue has a meaningful description and provides enough information to reproduce the issue. If the report is valid, add Issue: Clear Description label to the issue by yourself.

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• 4. Verify that the issue is reproducible on 2.4-develop branch

  Details

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[engcom-Hotel]

Hello @ByJacob,

I hope your problem has been solved by going through the documentation link in this comment.

Thanks

[ByJacob]

Unfortunately, that does not solve the problem. The documentation only shows the different methods for configuring ElastiCache and how to connect to it when Cluster Mode is turned off and on.
My probleme is that I cannot configure redis backend when redis is running with cluster mode enabled.

• The colinmollenhour/Cm_Cache_Backend_Redis package in use does not support cluster configuration.
• The cache backend documentation does not describe how to configure a cluster.
• Session documentation in redis describes the use of sentinel in redis, however it is master -> multiple replicas configuration. The configuration of the cluster in redis can operate on several masters.
• The php client that handles the redis configuration is predis.
• Tutorial for redis-cluster

Without special cluster handling, the master switches during writing, which the current php code interprets as an error. For example, in the redis-cli command, use the special -c flag so that it can properly communicate with the redis cluster.

[engcom-Hotel]

Hello @ByJacob,

Thanks for the confirmation!

We have tried to reproduce the issue by following the Redis cluster documentation here. And after setting up the Redis cache by following the Magento docs, we are able to reproduce the issue in the latest Magento 2.4-develop branch.

Please have a look at the below screenshot for reference:

Hence confirming this issue.

Thanks

[github-jira-sync-bot]

✅ Jira issue https://jira.corp.magento.com/browse/AC-2565 is successfully created for this GitHub issue.

[m2-assistant]

✅ Confirmed by @engcom-Hotel. Thank you for verifying the issue.
Issue Available: @engcom-Hotel, You will be automatically unassigned. Contributors/Maintainers can claim this issue to continue. To reclaim and continue work, reassign the ticket to yourself.

[engcom-Hotel]

Hello @ByJacob,

We have further investigated this issue and we have integrated the Redis cluster in app/etc/env.php. (Attached is the screenshot for the same):

Below are the points that come up in the investigation:

• The function which is used for redis cluster setup in credis_client is in the ColinMollenHour module, is not using it anymore which is also mentioned in the code in file vendor/colinmollenhour/cache-backend-redis/Cm/Cache/Backend/Redis.php line no 436.
• Credis client method 'isMulti' which needs to be 'TRUE' in order to work with redis cluster and the default value is set as 'False' in file vendor/colinmollenhour/credis/Client.php. The exception is thrown when __call function is called from Credis_Client class for 'hGet' before 'multi' hence not converting isMulti = 'True'.

Hence the issue is not related to the Magento core library.

Thanks

[ByJacob]

Hello,
So one question, why was colinmollenhour/Cm_Cache_Backend_Redis used instead of the more elaboratepredis/predis, since predis supports almost all redis functionality?
And another question, what does Component: Bundled Extension mean. Waiting as the library to have this functionality? If so, why not use predis which has php 8.1 support already (predis/predis@acb2460)?

[engcom-Hotel]

Hello @ByJacob,

Hence this issue is not related to Magento core code, so I suggest you refer to the Community Forums or Magento Stack Exchange for technical questions, feature requests, etc.

Thanks

[robsoned]

As on the way it's implemented right now, it causes an issue to integrate with redis, a system requirement to run the application on production with good performance. With that said, why this issue would not be related to Magento core code?

[engcom-Hotel]

Hello,

The related issue has been fixed now and is unable to reproduce on the latest development branch i.e. 2.4-develop. Hence closing this ticket.

Thanks

[vishwanathkharabe]

Hi @engcom-Hotel ,
Earlier you were able to reproduce this issue,
#35140 (comment)
but in your latest comment #35140 (comment)
you said it is fixed. Can we know what changes you made to fix this, is there any PR ?
Thanks!

[devops-digitalsilk]

I still have the same issue, version 2.4.3-p3. Configuration the cluster always returning MOVED in the first line of magento bin composer.