Projection settings on EventStore cluster

Hi there,

I have a questions about the EventStore cluster mode. We have three instances(A,B,C) of EventStore cluster. Only instance B has the configuration run-projections=all.

When I try to enable the $by_category projection on instance B, I get the internal server error message continuously. The status of projection $by_category is Preparing.

So my question is

Is the configuration of projection correct ? Is it required to enable $by_category on all instances ?

Thanks in advance.

You do not need --run-projections=all for system projections (–run-projections=system which is the default). This should be set on all nodes in the cluster.