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Are you asking why the lookup is enabled? From the warning, it seem that

druid.lookup.snapshotWorkingDir

is set - but the coordinator can’t find the the config file,

lookupSnapshot.json

, in that directory. If you don’t want the lookup to be enabled, you could unset the property and restart the coordinator. Please see: https://druid.apache.org/docs/latest/querying/lookups.html#saving-configuration-across-restarts

Ok, thanks Abhishek! I need to add lookup config, isn’t it going to add into automatically by pulling it from metadata db?

No, the property needs to be set in the coordinator’s runtime properties. Setting that property just ensures that the coordinator will automatically load static lookups across restarts.