I have a cluster setup but no ingestion task succeeds

I use 0.15 version, started cluster with default cluster configurations

However, no Ingestion task works. It always finishes with failure.

I looked at the task logs and there is an error message:
No server instance found for [druid/overlord]

But I have overlord (inside coordinator process) in the master server, a default configuration I didn’t change.

I have no idea what to do next.

Thanks!

It sounds like the coordinator-overlord process is not available, if you’re using the quickstart, you can check the coordinator-overlord log under var/sv and see if there are errors there.