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[BUGS-7518] drupal redis module patches #9281

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Oct 25, 2024
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[BUGS-7518] drupal redis module patches #9281

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[BUGS-7518] drupal redis module patches
scottbuscemi Oct 24, 2024
1eda9d2
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rachelwhitton Oct 25, 2024
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14 changes: 12 additions & 2 deletions source/content/addons/object-cache/reference/faq.md
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Expand Up @@ -3,7 +3,7 @@ title: Object Cache FAQs
description: Review frequently asked questions on Object Caching.
permalink: docs/object-cache/faq
tags: [cache, plugins, modules, database]
reviewed: "2023-08-17"
reviewed: "2024-10-25"
contenttype: [doc]
innav: [true]
categories: [cache]
Expand All @@ -12,7 +12,7 @@ audience: [development]
product: [--]
integration: [--]
showtoc: true
contributors: [cityofoaksdesign, carolynshannon, jms-pantheon, whitneymeredith]
contributors: [cityofoaksdesign, carolynshannon, jms-pantheon, whitneymeredith, scottbuscemi]
---

This section provides answers to frequently asked Object Cache questions.
Expand Down Expand Up @@ -68,6 +68,16 @@ activerehashing yes

Note that the `maxmemory` value will vary based on plan level.

### Does Pantheon have optimization recommendations?

Our customers have encountered edge cases that may affect Redis performance under load during high traffic periods. There are several patches to the Drupal module available to alleviate the issues:

| Issue Description | Patch Link |
| -------- | ------- |
| [TTL handling broken, always permanent](https://www.drupal.org/project/redis/issues/3179757) | [Patch](https://www.drupal.org/files/issues/2020-10-30/3179757-4.patch) |
| [Always return array to mget to avoid breaking transactions](https://www.drupal.org/project/redis/issues/3216874) | [Patch](https://www.drupal.org/files/issues/2021-11-16/3216874-2.patch) |
| [TTL handling broken, always permanent](https://www.drupal.org/project/redis/issues/3102739) | [Patch](https://www.drupal.org/files/issues/2023-07-11/3102739-28.patch) |

### If Redis Hits the Upper Limit of Memory Usage, Is This Logged on Pantheon?

Yes. There is a `redis.log` file that is available on the Redis container for each environment.
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