Move lookup docs that are in druid-proper back into lookups.md

[drcrallen]

No description provided.

[fjy]

@drcrallen Is dynamic configuration not a part of any extension?

[fjy]

can we use the note-caution div to indicate experimental?

[drcrallen]

I can, but don't know the syntax you're looking for, is there another doc that uses that indication?

[drcrallen]

ah, found it

[drcrallen]

fixed

[fjy]

@drcrallen this will have to be backported

[drcrallen]

Dynamic config is not an extension

[drcrallen]

@fjy well, this feature is in 0.9.1 not 0.9.0

[fjy]

@drcrallen okay

can we remove it from the 0.9.0 docs then?

[drcrallen]

they are not in 0.9.0: https://github.com/druid-io/druid/blob/0.9.0/docs/content/querying/lookups.md

[gianm]

@drcrallen is the namespaced lookup extension no longer suggested for use in 0.9.1, in favor of the dynamic config stuff?

[drcrallen]

@gianm that is still being developed. @sirpkt beat me to the punch on this part: #2716

Once #2716 is fleshed out a little more we'll know for sure. But right now there is not enough change in master to make the change in recommendation.

[gianm]

ok, I'm asking because this PR removes references to the namespaced-lookups extension from lookups.md. I feel like we should have some stuff on both lookups.md and the namespaced lookup extension docs that clarify the situation for readers.

[gianm]

@drcrallen In other words: I am happy with this PR to the degree that you are happy with how lookups.md and namespaced-lookup.md make it clear to readers what the options are for cluster-wide server-side query time lookups, and what the most recommended option is.

[drcrallen]

@gianm ah good point, I read

For lookups defined cluster-wide rather than embedded in the query, please look at the namespaced lookup extension.

and thought of the cluster wide config. I didn't think of the static config in the extension. I'll add that line back in.

[drcrallen]

@gianm changed to

For static lookups defined in runtime.properties rather than embedded in the query, please look at the experimental namespaced lookup extension.

[gianm]

👍 looks good to me, thanks for catching this.