Hello everyone,
I was stress-testing my application (running on Rails via FastCGI) by
letting two concurrent users (not human .. an app called 'siege')
a) save an Article and b) search for all Articles.
I am searching via
Article.ferret_index.search_each( ..) do |doc_id,score|
doc = index[doc_id]
..
end
and writing via
Article.ferret_index << self.to_doc
where Article.ferret_index is implemented as in 'act_as_ferret':
@@ferret_index = nil
def Article::ferret_index
@@ferret_index ||= Ferret::Index::Index.new( :path => ferret_path,
:auto_flush => true, :create_if_missing => false )
end
The 2 errors I got (when I do "doc = index[doc_id]") were :
ArgumentError (:12250 is out of range [0..12243] for IndexWriter#[]):
/usr/lib/ruby/gems/1.8/gems/ferret-0.10.8/lib/ferret/index.rb:382:in
`[]'
/usr/lib/ruby/gems/1.8/gems/ferret-0.10.8/lib/ferret/index.rb:382:in
`[]'
/usr/lib/ruby/1.8/monitor.rb:229:in `synchronize'
/usr/lib/ruby/gems/1.8/gems/ferret-0.10.8/lib/ferret/index.rb:375:in
`[]'
...
Ferret::StateError (State Error occured at <except.c>:79 in xraise
Error occured in index.c:3404 - sr_get_lazy_doc
Document 0 has already been deleted
):
/usr/lib/ruby/gems/1.8/gems/ferret-0.10.8/lib/ferret/index.rb:382:in
`[]'
/usr/lib/ruby/gems/1.8/gems/ferret-0.10.8/lib/ferret/index.rb:382:in
`[]'
/usr/lib/ruby/1.8/monitor.rb:229:in `synchronize'
/usr/lib/ruby/gems/1.8/gems/ferret-0.10.8/lib/ferret/index.rb:375:in
`[]'
...
So, obviously the index changed after #search_each and before "doc =
index[doc_id]".
Is this expected behaviour? How to avoid this?
Then I did the same thing without a webserver, just 2 consoles. One for
saving, one for searching.
The one searching now just ends with
"/usr/lib/ruby/gems/1.8/gems/ferret-0.10.8/lib/ferret/index.rb:363:
[BUG] Segmentation fault"
As for now, to avoid the problem, I use an IndexReader that I newly
create for every search.
But I guess that is not the best approach?
I am using ferret 0.10.8 and ruby 1.8.4 on Debian Sarge.
Best regards
josh
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