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From Adrien Grand <>
Subject Re: what's replacement of FieldCache in Lucene 7
Date Thu, 12 Apr 2018 11:57:52 GMT

Doc values should be used instead of the field cache indeed. Note that this
require to add them to your documents at index time, eg. with a

Regarding random access, maybe you can use the advanceExact API, which
exists on all doc-value iterators. Just make sure to never call it on
decreasing doc IDs. If that doesn't work for you, can you describe you
use-case, maybe there are better ways to implement what you need.

Le jeu. 12 avr. 2018 à 13:54, Yonghui Zhao <> a écrit :

> Hi,
> I am upgrading my project from Lucene 4 to 7.
> FieldCache is removed in lucene 7,  DocValue is replacement?
> But seems DocValue doesn't support random access.
> I need random access to get some specified field value quickly.
> So how to solve it?

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