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From Danil Ε’ORIN <>
Subject Re: Proposal about Version API "relaxation"
Date Thu, 15 Apr 2010 12:17:33 GMT
Sometimes it's REALLY impossible to reindex, or has absolutely prohibitive
cost to do in a running production system (i can't shut it down for
maintainance, so i need a lot of hardware to reindex ~5 billion documents, i
have no idea what are the costs to retrieve that data all over again, but i
estimate it to be quite a lot)

And providing a way to migrate existing indexes to new lucene is crucial
from my point of view.

I don't care what this way is: calling optimize() with newer lucene or
running some tool that takes 5 days, it's ok with me.

Just don't put me through full reindexing as I really don't have all that
data anymore.
It's not my data, i just receive it from clients, and provide a search

It took years to build those indexes, rebuilding is not an option, and
staying with old lucene forever just sucks.


On Thu, Apr 15, 2010 at 14:57, Robert Muir <> wrote:

> On Thu, Apr 15, 2010 at 7:52 AM, Shai Erera <> wrote:
>> Well ... I must say that I completely disagree w/ dropping index structure
>> back-support. Our customers will simply not hear of reindexing 10s of TBs of
>> content because of version upgrades. Such a decision is key to Lucene
>> adoption in large-scale projects. It's entirely not about whether Lucene is
>> a content store or not - content is stored on other systems, I agree. But
>> that doesn't mean reindexing it is tolerable.
> I don't understand how its helpful to do a MAJOR version upgrade without
> reindexing... what in the world do you stand to gain from that?
> The idea here, is that development can be free of such hassles. Development
> should be this way.
> If you, Shai, need some feature X.Y.Z from Version 4 and don't want to
> reindex, and are willing to do the work to port it back to Version 3 in a
> completely backwards compatible way, then under this new scheme it can
> happen.
> --
> Robert Muir

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