[KinoSearch] Playing with MultiSearcher framework

[Marvin Humphrey]

On Nov 2, 2007, at 5:45 AM, Henry wrote:

> my $hits = $multi_searcher->search(
>     query            => $q,
>     offset           => $offset,
>     num_wanted  => $hits_per_page,
>     sort_spec      => $sort_spec,
> );
> KinoSearch::Search::MultiSearcher->set_enable_sorting(1); # (A)

> Searching using the above code results in a "sort_spec not currently
> supported by MultiSearcher..." error no matter where I place (A).

I don't get that.  Does it happen even if you place it right after  
the 'use' directive?  That error occurs in $multi_searcher->top_docs 
(), which is called internally by $multi_searcher->search().  Calling  
set_enable_sorting() any time prior to the $multi_searcher->search()  
command ought to work.

For those not yet in the know (which is everyone except Henry)... I  
hacked in undocumented support for remote sorting, but it's crippled  
by default because the implementation is less than ideal.

> Commenting (ignorant quick-hack, I know) out:
> #confess("sort_spec not currently supported by MultiSearcher")
> #       if ( $sort_spec and !$enable_sorting );
> in /usr/lib/perl5/.../KinoSearch/Search/MultiSearcher.pm
> results in an error cascade starting with "Use of uninitialized  
> value in
> read at...SearchClient.pm line 66, <GEN2> line 1.".

Line 66 is where the SearchClient tries to read from the socket.   
It's failing because the remote node isn't responding.

> This also kills the ::SearchServer process with the error "Can't  
> locate
> object method "make_field_doc_collator" via package "KinoSearch::Se
> arch::SortSpec"...Searcher.pm line 62, <GEN2> line 3.".

It looks like KinoSearch::Searcher does not contain a "use  
KinoSearch::Search::SortSpec" directive, so you'll have to add that  
to the scripts running on the slave nodes.  I should probably add  
that to Searcher.  Hey, what's one more module to load? :\

> Commenting out all the sort code, but enabling the highlighter code,
> results in the error: "Can't call method "set_terms" on an  
> undefined value
> at...Search/Hits.pm line 73, <GEN2> line 1."

I think that's happening because of this:

   #$hits->create_excerpts( );
   #$hits->create_excerpts( highlighter => $highlighter );

'highlighter' is a required argument for $hits->create_excerpts, so  
that first line would fail.  I should probably add validation code to  
create_excerpts() so that a more meaningful error message gets produced.

Marvin Humphrey
Rectangular Research
http://www.rectangular.com/



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