This message was deleted.

I see a config, maybe an answer.

druid.broker.segment.awaitInitializationOnStart：Whether the Broker will wait for its view of segments to fully initialize before starting up. If set to 'true', the Broker's HTTP server will not start up, and the Broker will not announce itself as available, until the server view is initialized. See also druid.sql.planner.awaitInitializationOnStart, a related setting.

default is true

That is my understanding: the broker will not be open for business until it has the segment map when this is

true

.