Ferret DRB - can add/edit index, but can't search

Ruby Apps Ferret
1

I’m trying to use the Ferret DRB server to avoid concurrency issues when
using multiple mongrels. I can successfully add and edit data on my
index via the DRB server, however, when I search the index, I get the
following error:

DRb::DRbConnError (DRb::DRbServerNotFound):
/usr/lib/ruby/1.8/drb/drb.rb:1647:in current_server' /usr/lib/ruby/1.8/drb/drb.rb:1709:into_id’
/usr/lib/ruby/1.8/drb/drb.rb:1045:in initialize' /usr/lib/ruby/1.8/drb/drb.rb:639:inmake_proxy’
/usr/lib/ruby/1.8/drb/drb.rb:556:in dump' /usr/lib/ruby/1.8/drb/drb.rb:600:insend_request’
/usr/lib/ruby/1.8/drb/drb.rb:599:in send_request' /usr/lib/ruby/1.8/drb/drb.rb:903:insend_request’
/usr/lib/ruby/1.8/drb/drb.rb:1191:in send_message' /usr/lib/ruby/1.8/drb/drb.rb:1083:inmethod_missing’
/usr/lib/ruby/1.8/drb/drb.rb:1167:in open' /usr/lib/ruby/1.8/drb/drb.rb:1082:inmethod_missing’
/usr/lib/ruby/1.8/drb/drb.rb:1100:in with_friend' /usr/lib/ruby/1.8/drb/drb.rb:1081:inmethod_missing’
/vendor/plugins/acts_as_ferret/lib/remote_index.rb:20:in
find_id_by_contents' /vendor/plugins/acts_as_ferret/lib/class_methods.rb:120:infind_id_by_contents’
/vendor/plugins/acts_as_ferret/lib/class_methods.rb:176:in
ar_find_by_contents' /vendor/plugins/acts_as_ferret/lib/class_methods.rb:170:infind_records_lazy_or_not’
/vendor/plugins/acts_as_ferret/lib/class_methods.rb:86:in
find_by_contents' /app/models/article.rb:104:infull_text_search’
/app/controllers/search_controller.rb:93:in index' /usr/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/base.rb:1095:inperform_action_without_filters’
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/filters.rb:632:in
call_filter' /usr/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/filters.rb:619:inperform_action_without_benchmark’
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/benchmarking.rb:66:in
perform_action_without_rescue' /usr/lib/ruby/1.8/benchmark.rb:293:inmeasure’
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/benchmarking.rb:66:in
perform_action_without_rescue' /usr/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/rescue.rb:83:inperform_action’
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/base.rb:430:in
process_without_filters' /usr/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/filters.rb:624:inprocess_without_session_management_support’
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/session_management.rb:114:in
process' /usr/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/base.rb:330:inprocess’
/usr/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/dispatcher.rb:41:in
dispatch' /usr/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel/rails.rb:78:inprocess’
/usr/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel/rails.rb:76:in
process' /usr/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel.rb:618:inprocess_client’
/usr/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel.rb:617:in
process_client' /usr/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel.rb:736:inrun’
/usr/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel.rb:736:in
run' /usr/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel.rb:720:inrun’
/usr/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel/configurator.rb:271:in
run' /usr/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel/configurator.rb:270:inrun’
/usr/lib/ruby/gems/1.8/gems/mongrel-1.0.1/bin/mongrel_rails:127:in
run' /usr/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel/command.rb:211:inrun’
/usr/lib/ruby/gems/1.8/gems/mongrel-1.0.1/bin/mongrel_rails:243
/usr/bin/mongrel_rails:16

When I’m adding/editing data in the index, my ferret_server.log file
shows the following:

#method_missing(:add, [“Article”, {:synopsis=>“Analysis and
Projections”, :status=>1, :player_names=>"", :team_names=>"",
:publisher=>"", :title=>“Article Title”, :db_state=>0, :id=>1,
:article_published_date=>1189115220}])
#method_missing(:add, [“Article”, {:synopsis=>“Analysis and
Projections”, :status=>1, :player_names=>"", :team_names=>"",
:publisher=>"", :title=>“Article Title 1”, :db_state=>0, :id=>1,
:article_published_date=>1189115220}])
#method_missing(:add, [“Player”, {:last_name=>“Smith”,
:first_name=>“Walter”, :db_state=>0, :id=>1}])
#method_missing(:add, [“Team”, {:name=>“Kalispell HS”, :db_state=>0,
:id=>13}])

I’m running the following environment:

Linux version 2.6.16.29-xen_3.0.3.0
mongrel (1.0.1)
mongrel_cluster (1.0.2, 0.2.1)
ferret (0.11.4)
acts_as_ferret stable plugin (as of 9/7/2007)

I have no problem running this application on my local development
environment… and I had no problems running in this hosting environment
before I started using Ferret DRB.

Here are some example sorts and/or filters I’m using in my searches (not
sure if this matters to Ferret DRB or not):

Ferret::Search::SortField.new(:article_published_date, :reverse => true)

Ferret::Search::Sort.new([Ferret::Search::SortField::SCORE, date_sort])

Ferret::Search::RangeQuery.new(:article_published_date, :>= =>
UserSystem::APP_DEFAULTS[:days_for_new].days.ago.utc.to_i.to_s, :<= =>
Time.now.utc.to_i.to_s)

Ferret::Search::Sort.new([Ferret::Search::SortField.new(:article_published_date,
:reverse => true)])

Any ideas why my searches wouldn’t be working?

2

I wanted to note the Ruby and Rails versions that I’m running, in case
that helps.

Linux version 2.6.16.29-xen_3.0.3.0

  • Ruby 1.8.4 (2005-12-24 [i386-linux]
  • Rails 1.2.3

mongrel (1.0.1)
mongrel_cluster (1.0.2, 0.2.1)
ferret (0.11.4)
acts_as_ferret stable plugin (as of 9/7/2007)

3

Jens,

Thanks for your help. I ripped out the Sort, SortField and RangeQuery
objects, and sure enough - it worked. I’ll try your suggestions
tomorrow – using the sort fields and FQL.

Brandon

Jens K. wrote:

Hi Brandon,

transmitting objects from Ferret’s API across the DRb connection is
always a bit tricky. If these don’t serialize correctly, DRb only
transmits a stub and then tries to talk back to the original object
via a DRb connection from the server to your web server process, which
results in the message you see.

Sort and SortFields should work, but I’m not sure if I introducted the
one or the other after the 0.4.1 release. Imho, Sort objects can simply
be replaced by an array holding the SortFields.

For the RangeQueries and other query objects that fail the way you
describe, please try using FQL instead to see if this fixes the problem.

cheers,
Jens

4

Hi Brandon,

transmitting objects from Ferret’s API across the DRb connection is
always a bit tricky. If these don’t serialize correctly, DRb only
transmits a stub and then tries to talk back to the original object
via a DRb connection from the server to your web server process, which
results in the message you see.

Sort and SortFields should work, but I’m not sure if I introducted the
one or the other after the 0.4.1 release. Imho, Sort objects can simply
be replaced by an array holding the SortFields.

For the RangeQueries and other query objects that fail the way you
describe, please try using FQL instead to see if this fixes the problem.

cheers,
Jens

On Fri, Sep 07, 2007 at 08:18:52PM +0200, Brandon Kelly wrote:

I’m trying to use the Ferret DRB server to avoid concurrency issues when
using multiple mongrels. I can successfully add and edit data on my
index via the DRB server, however, when I search the index, I get the
following error:

DRb::DRbConnError (DRb::DRbServerNotFound):
/usr/lib/ruby/1.8/drb/drb.rb:1647:in `current_server’
[…]

Posted via http://www.ruby-forum.com/.

Ferret-talk mailing list
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http://rubyforge.org/mailman/listinfo/ferret-talk

–
Jens Krämer
http://www.jkraemer.net/ - Blog
http://www.omdb.org/ - The new free film database

5

Just to close out this thread –

After I converted the Sort, SortFields to :sort = [‘field_one DESC’,
field_two’] and RangeQueries to FQL - Ferret DRB worked fine.

The simpler approach is usually the right approach.

Thanks Jens - for your suggestions.

  • Brandon

Brandon Kelly wrote:

Jens,

Thanks for your help. I ripped out the Sort, SortField and RangeQuery
objects, and sure enough - it worked. I’ll try your suggestions
tomorrow – using the sort fields and FQL.

Brandon