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From: Michael McCandless <lucene@mikemccandless.com>
Date: Thu, 17 Oct 2013 20:48:45 -0400
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 <CAL8Pwkbrzkb7qwrVpRtu+bkVfW8xXiM8Pbn74-Mr1g3Vp-qvHg@mail.gmail.com>
Subject: Re: How to get Total Result count using searchAfter approach
To: Lucene Users <java-user@lucene.apache.org>
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You can still use TopDocs.totalHits from searchAfter; that will be correct.

Providing "Last" with searchAfter is not really possible; it's also
somewhat strange (does anybody really use that?).  Maybe you could
reverse your sort, take page 1, reverse its hits?

Mike McCandless

http://blog.mikemccandless.com


On Thu, Oct 17, 2013 at 6:16 PM,  <raghavendra.k.rao@barclays.com> wrote:
> Hi,
>
> In my current implementation of Lucene 4.3 where there are millions of in=
dexed records, I do a regular search() and get the topDocs.totalHits as the=
 count of results.
>
> As part of this, I store all the results in the session and then let the =
user paginate through the results. With this, I am able to show the "First"=
 "Previous" "Next" and "Last" links for navigation along with the "Page 1 o=
f 500" display.
>
> Obviously, this led to memory issues and I have now decided to use the se=
archAfter() method and hence avoid storing the huge result set in memory.
>
> Question 1: How can I get the total result count in this case? Is it even=
 possible as I won't be getting the entire resultset?
>
> Question 2: I know I can provide the "Previous" and "Next" options for pa=
ginating, but is there anyway I can still provide the "Last" page option, a=
s to do that I would need to provide the document object just before the la=
st page begins.
>
> Please suggest.
>
> Regards,
> Raghu
>
>
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