Ferret talk - Nov 2006 - Safe to read index while it is being written to?

Is it safe to open the index to do searches on while another process is
writing to the index?

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

On Nov 2, 2006, at 6:47 PM, Dan Yelp wrote:
> Is it safe to open the index to do searches on while another  
> process is
> writing to the index?
Yes.  The caveat is that an IndexReader or IndexSearcher only sees  
what was indexed at the time the index was opened, and will not see  
documents written since.  Seeing changes requires re-opening.  See  
Solr discussions on auto-warming if you need faster searches out of  
the gate.

	Erik

oops... i replied as if this was the java-user list, not the Ferret  
one.  sorry for mixing up my languages.  ai ya!


On Nov 2, 2006, at 9:48 PM, Erik Hatcher wrote:
>
> On Nov 2, 2006, at 6:47 PM, Dan Yelp wrote:
>> Is it safe to open the index to do searches on while another
>> process is
>> writing to the index?
>
> Yes.  The caveat is that an IndexReader or IndexSearcher only sees
> what was indexed at the time the index was opened, and will not see
> documents written since.  Seeing changes requires re-opening.  See
> Solr discussions on auto-warming if you need faster searches out of
> the gate.
>
> 	Erik
>
> _______________________________________________
> Ferret-talk mailing list
> Ferret-talk at rubyforge.org
> http://rubyforge.org/mailman/listinfo/ferret-talk

Dan Yelp wrote:
> Is it safe to open the index to do searches on while another process is
> writing to the index?
I don''t know the technical details, but I have experienced some
problems
when trying to do this.  I have an index of about 275K short documents, 
and in an ideal world I''d be updating it continuously.  Right now I
wait
until the off-hours because if I''m updating the index at all, searches 
tend to cause my mongrel procs to either hang (100% CPU util), or 
segfault (documented in a ticket on the ferret track).  I have processes 
in place to correct these problems when they occur, but it''s still 
discouraging because I can''t keep the data as fresh as I''d
like it to
be.

Jim

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