Hi Brian,
You should be able to sort on field with only sorted values.

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> On 2 Feb 2018, at 16:53, Brian Yee <b...@wayfair.com> wrote:
> Hello Erick,
> I did look into updatable docValues, but my understanding is that the field 
> has to be non-indexed (indexed="false"). I need to be able to sort on these 
> values. External field fields are sortable.
> https://lucene.apache.org/solr/guide/6_6/updating-parts-of-documents.html#UpdatingPartsofDocuments-In-PlaceUpdates
> -----Original Message-----
> From: Erick Erickson [mailto:erickerick...@gmail.com] 
> Sent: Thursday, February 1, 2018 5:00 PM
> To: solr-user <solr-user@lucene.apache.org>
> Subject: Re: External file fields
> Have you considered updateable docValues?
> Best,
> Erick
> On Thu, Feb 1, 2018 at 10:55 AM, Brian Yee <b...@wayfair.com> wrote:
>> Hello,
>> I want to use external file field to store frequently changing inventory and 
>> price data. I got a proof of concept working with a mock text file and this 
>> will suit my needs.
>> What is the best way to keep this file updated in a fast way. Ideally I 
>> would like to read changes from a Kafka queue and write to the file. But it 
>> seems like I would have to open the whole file, read the whole file, find 
>> the line I want to change, and write the whole file for every change. Is 
>> there a better way to do that? That approach seems like it would be 
>> difficult/slow if the file is several million lines long.
>> Also, once I come up with a way to update the file quickly, what is the best 
>> way to distribute the file to all the different solrcloud nodes in the 
>> correct directory?

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