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From John Wang <john.w...@gmail.com>
Subject Re: 2.9 NRT w.r.t. sorting and field cache
Date Tue, 22 Sep 2009 07:32:07 GMT
Thanks Mark for the pointer!

I guess my point is with NRT, and when segment files change often, this
would be an issue, no?

Anyway, I can run some tests.

Thanks

-John

On Tue, Sep 22, 2009 at 3:21 PM, Mark Miller <markrmiller@gmail.com> wrote:

> 1483 - indexsearcher pulls out a readers subreaders (segmentreaders) and
> sends a collector over them one by one, rather than using the multireader.
> So only fc for seg readers that change need to be reloaded.
>
> - Mark
> http://www.lucidimagination.com (mobile)
>
> On Sep 22, 2009, at 1:27 AM, John Wang <john.wang@gmail.com> wrote:
>
> Hi Yonik:
>
>      Actually that is what I am looking for. Can you please point me to
> where/how sorting is done per-segment?
>
>      When heaving indexing introduces or modifies segments, would it cause
> reloading of FieldCache at query time and thus would impact search
> performance?
>
> thanks
>
> -John
>
> On Tue, Sep 22, 2009 at 1:05 PM, Yonik Seeley <<yonik@lucidimagination.com>
> yonik@lucidimagination.com> wrote:
>
>> On Tue, Sep 22, 2009 at 12:56 AM, John Wang < <john.wang@gmail.com>
>> john.wang@gmail.com> wrote:
>> > Looking at the code, seems there is a disconnect between how/when field
>> > cache is loaded when IndexWriter.getReader() is called.
>>
>> I'm not sure what you mean by "disconnect"
>>
>> > Is FieldCache updated?
>>
>> FieldCache entries are populated on demand, as they always have been.
>>
>> > Otherwise, are we reloading FieldCache for each
>> > reader instance?
>>
>> Searching/sorting is now per-segment, and so is the use of the
>> FieldCache.  Segments that don't change shouldn't have to reload their
>> FieldCache entries.
>>
>> -Yonik
>>  <http://www.lucidimagination.com>http://www.lucidimagination.com
>>
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