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From Michael McCandless <>
Subject Re: Near Real Time Indexing and Searching with solr 3.6
Date Tue, 03 Jul 2012 12:40:14 GMT

You might want to take a look at Solr's trunk (very soon to be 4.0.0
alpha release), which already has a near-real-time solution (using
Lucene's near-real-time APIs).

Lucene has NRTCachingDirectory (to use RAM for small / recently
flushed segments), but I don't think Solr uses it yet.

Mike McCandless

On Tue, Jul 3, 2012 at 4:02 AM, thomas <> wrote:
> Hi,
> As part of my bachelor thesis I'm trying to archive NRT with Solr 3.6. I've
> came up with a basic concept and would be trilled if I could get some
> feedback.
> The main idea is to use two different Indexes. One persistent on disc and
> one in RAM. The plan is to route every added and modified document to the
> RAMIndex ( After a certain period of time, this
> index would get cleared and the documents get added to the persistent Index.
> Some major problems I still have with this idea is:
> - deletions of documents from documents in the persistent index
> - having the same unique IDs in both the RAM index and persitent Index, as a
> result of an updated document
>   - Merging search results to filter out old versions of updated documents
> Would such an idea be viable to persuit?
> Thanks for you time

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