You are viewing a plain text version of this content. The canonical link for it is here.

Posted to java-user@lucene.apache.org by Shai Erera <se...@gmail.com> on 2008/01/11 13:42:22 UTC

Retrieve the number of deleted documents

Hi

I didn't find a proper API on InderWriter or IndexReader to retrieve the
total number of deleted documents.
Will IndexReader.maxDocs() - IndexReader.numDocs() give the correct result?
or this is just a heuristic?

Thanks,

Shai

Re: Retrieve the number of deleted documents

Posted by Shai Erera <se...@gmail.com>.

Thanks
I guess I should have looked in the code before asking those silly questions
:-)
I wonder why there isn't a specific API for that though ...

On Jan 11, 2008 7:36 PM, Steven A Rowe <sa...@syr.edu> wrote:

> Hi Shai,
>
> On 01/11/2008 at 7:42 AM, Shai Erera wrote:
> > Will IndexReader.maxDocs() - IndexReader.numDocs() give the
> > correct result? or this is just a heuristic?
>
> I think your expression gives the correct result - the abstract
> IndexReader.numDocs() method is implemented in SegmentReader as:
>
>  public int numDocs() {
>    // Don't call ensureOpen() here (it could affect performance)
>    int n = maxDoc();
>    if (deletedDocs != null)
>      n -= deletedDocs.count();
>    return n;
>  }
>
> Steve
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
> For additional commands, e-mail: java-user-help@lucene.apache.org
>
>


-- 
Regards,

Shai Erera

RE: Retrieve the number of deleted documents

Posted by Steven A Rowe <sa...@syr.edu>.

Hi Shai,

On 01/11/2008 at 7:42 AM, Shai Erera wrote:
> Will IndexReader.maxDocs() - IndexReader.numDocs() give the
> correct result? or this is just a heuristic?

I think your expression gives the correct result - the abstract IndexReader.numDocs() method is implemented in SegmentReader as:

  public int numDocs() {
    // Don't call ensureOpen() here (it could affect performance)
    int n = maxDoc();
    if (deletedDocs != null)
      n -= deletedDocs.count();
    return n;
  }

Steve

---------------------------------------------------------------------
To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
For additional commands, e-mail: java-user-help@lucene.apache.org