# Keycloak clustering in 21.1.1 vs 20.x.x

**URL:** <https://forum.keycloak.org/t/keycloak-clustering-in-21-1-1-vs-20-x-x/22758>\
**Category:** Configuring the server\
**Tags:** clustering\
**Created:** [June 19, 2023, 10:41am UTC](https://forum.keycloak.org/t/keycloak-clustering-in-21-1-1-vs-20-x-x/22758 "2023-06-19T10:41:42Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![sherif](https://yyz2.discourse-cdn.com/free1/user_avatar/forum.keycloak.org/sherif/32/5578_2.png) [@sherif](https://forum.keycloak.org/u/sherif)\
**Post date:** [June 19, 2023, 10:41am UTC](https://forum.keycloak.org/t/keycloak-clustering-in-21-1-1-vs-20-x-x/22758/1 "2023-06-19T10:41:42Z")

</div>

I upgraded my dev env from 20.x.x to latest 21.1.1 but the clustering using UDP isn’t happy with the following settings:

```auto
thread_dumps_threshold="${jgroups.thread_dumps_threshold:10000}"
max_bundle_size="8500"
enable_diagnostics="false"

```

As far as I can tell, removing them, disable cluster and enable it again, works without those settings, but I can’t find a reason why those are gone and not supported anymore, and it is not related to the openJDK bug in 17 and 19 since we are testing with openJDK11 as well