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.
Best regards,
Christoph
Am 27.03.2012 18:15, schrieb Michael McCandless:
In general how Lucene assigns docIDs is a volatile implementation
detail: it's free to change from release to release.
Eg, the default merge policy (TieredMergePolicy) merges out-of-order
segments. Another eg: at one point, IndexSearcher re-ordered the
segments on init. Another: because ConcurrentMergeScheduler runs
different merges in different threads, they can finish in different of
orders and thus alter how subsequent merges are selected.
Really it's best if you assign your own (app-level) ID field and use
that, if you need a stable ID.
Mike McCandless
http://blog.mikemccandless.com
On Tue, Mar 27, 2012 at 3:29 AM, Christoph Kaser
<lucene_l...@iconparc.de> wrote:
Hi all,
I have a search application with 16 million documents that uses custom
scores per document using a ValueSource. These values are updated a lot (and
sometimes all at once), so I can't really write them into the index for
performance reasons. Instead, I simply have a huge array of float values in
memory and use the document ID as index in the array.
This works great as long as the index is not changed, but as soon as I have
a few new documents and deletions, index segments are merged (I suppose) and
the document IDs of existing documents change. Is there any way to be
informed when document IDs of existing documents change? If so, is there a
way to calculate the new document ID from the old one, so I can "convert" my
array to the new document IDs?
Any help would be greatly appreciated!
Best regards,
Christoph
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Dipl.-Inf. Christoph Kaser
IconParc GmbH
Sophienstrasse 1
80333 München
www.iconparc.de
Tel +49 -89- 15 90 06 - 21
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Geschäftsleitung: Dipl.-Ing. Roland Brückner, Dipl.-Inf. Sven Angerer. HRB
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