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Signed-off-by: Attila Mészáros <a_meszaros@apple.com>
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title: Welcome read-cache-after-write consistency!!!
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# todo issue with this?
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#date: 2026-03-25
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author: >-
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[Attila Mészáros](https://github.com/csviri)
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---
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**TL;DR:**
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In version 5.3.0 we introduced strong consistency guarantees for updates.
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You can now update resources (both your custom resoure and managed resource)
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and the framwork will guaratee that these updates will be instantly visible,
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thus when accessing resources from caches;
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and naturally also for subsequent reconciliations.
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```java
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public UpdateControl<WebPage> reconcile(WebPage webPage, Context<WebPage> context) {
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ConfigMap managedConfigMap = prepareConfigMap(webPage);
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// apply the resource with new API
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context.resourceOperations().serverSideApply(managedConfigMap);
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// fresh resource instantly available from our update in the caches
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var upToDateResource = context.getSecondaryResource(ConfigMap.class);
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// from now on built in update methods by default use this feature;
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// it is guaranteed that resource changes will be visible for next reconciliation
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return UpdateControl.patchStatus(alterStatusObject(webPage));
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}
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```
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In addition to that framework will automatically filter events for your updates, thus those
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which are result of our own updates.
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{{% alert color=success %}}
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**These should significantly simplify controller development, and will make reconciliation
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much simpler to reason about!**
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{{% /alert %}}
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This post will deep dive in this topic, and explain all the rational and background behind this topic.
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## Informers and eventual consistency
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