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Hi, Please share: 1. Druid version 2. Any errors in the log files for master nodes ?

Druid version 24.02 Error Extension not found in Druid/extensions

What’s the name of the extension used/defined in the

common.runtime.properties

?

druid-distinctcount

This is not a core extension. Did you follow the steps to load it https://druid.apache.org/docs/latest/development/extensions.html#loading-community-extensions

No