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From Michael McCandless <>
Subject Re: App supplied docID in lucene possible?
Date Tue, 06 Nov 2012 11:23:45 GMT
On Tue, Nov 6, 2012 at 1:04 AM, Ravikumar Govindarajan
<> wrote:
> Looks far more complex than I had assumed!!!

I think it would be a major undertaking.

> An invariant of "non-decreasing docid per flush", if pushed to the app can
> save lucene from handling the complex sparse data logic no?
> Lucene can hold it's existing logic without major changes, detect any
> out-of-order doc before every flush and emit an error.

We could do that, though the sparseness problem remains, eg if the app
adds docID=1 and then docID=10000 ...

> I understand that multi-threaded indexing and such concerns also need to be
> handled by the app, but thats what apps get when trying to control docIDs

In 4.0 (an improvement over 3.6) each thread writes to its own private
segment ... so as long as one thread always indexed docs in monotonic
order that could in theory work ...

Mike McCandless

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