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From "Nadav Har'El" <...@il.ibm.com>
Subject Re: 1.9 RC1
Date Sun, 19 Feb 2006 10:50:19 GMT
Dan Armbrust <daniel.armbrust.list@gmail.com> wrote on 17/02/2006 08:50:53
PM:
>...
> Short summary - The Constructor for IndexWriter currently will only
> create an index in a folder if you set the boolean create flag to true.
>   But then, if you want to append to that index, you have to set the
> create flag to false (otherwise it overwrites)
>
> In my use cases, I seldom want to overwrite an index - but I often
> create new ones, and append to existing ones.  Forgetting to switch the
> boolean flag between the initial create and the append causes data loss.

Hi,

I agree: as a new user of Lucene, the first thing I wanted to do in my
program
was to open an existing index, or if one doesn't yet exist, create it. I
found
it very strange that this natural usage pattern wasn't naturally supported
by
Lucene. I ended up doing something complex like opening the index once with
create=false, and if that failed, try again with create=true, although this
had
additional problems like trying to recreate the index when we actually got
an
error which was not caused by a non-existant index.

So I'm not sure the solution is to change the semantics of the existing
constructor, but I think Lucene definitely need a new constructor or
convenience
function that will do "the right thing" for opening a potentially-existing
index.

--
Nadav Har'El.


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