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From Michael McCandless <>
Subject Re: Document-Ids and Merges
Date Wed, 28 Mar 2012 17:40:15 GMT
On Wed, Mar 28, 2012 at 3:37 AM, Christoph Kaser
<> wrote:
> Thank you for your answer!
> That's too bad. I thought of using my own ID-field, but I wanted to save the
> additional indirection (from docId to my ID to my value).
> Do document IDs remain constant for one IndexReader as long as it isn't
> reopened? If so, I could precalculate the indirection.

Yes, the entire view of the index presented by a single IndexReader is
unchanging (not just docIDs: everything).

On reopen, a new IndexReader is returned, so the old IndexReader is
still unchanged.

So, if you can hold your arrays per-segment, and init them per-segment
(such as FieldCache, or DocValues (only in 4.0) as Shai described)
then you can safely use the docID to index those arrays just within
the context of that segment.

Mike McCandless

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