Hi Ngan

There's not really any documentation around the changes, I'm afraid… but what 
you're seeing is a process per thread of your app, plus a master daemon 
process, due to the persisted connection pool.

All the logic for this connection pool can be found in 
ThinkingSphinx::Connection:
https://github.com/pat/thinking-sphinx/blob/v2/lib/thinking_sphinx/connection.rb

The HISTORY file has a list of all relevant changes though - here's the list of 
what's changed between 2.0.14 and 2.1.0 - but this and some delta refactoring 
are the biggest items:

* Removed plugin support - Thinking Sphinx is now gem-only across all branches.
* ThinkingSphinx::Version and the thinking_sphinx:version task have been 
removed - it's a gem, it has a version number.
* Updating Riddle to 1.5.6 or newer.
* Requires ActiveRecord ~> 2.1 for TS 1.x releases (earlier versions were 
considered unsupported a few releases ago).
* Allow custom Riddle controllers - useful for Flying Sphinx to take over 
management of Sphinx daemon/indexing actions.
* Rejigged delta support to be generic, with local job classes that provide a 
clean, simple interface for third-party libraries.
* Add hooks for anything that needs to happen before indexing (such as clearing 
out existing delta jobs).
* Connection pool for all Sphinx client communication, with new connections 
built if there's any connection-related (as opposed to syntax) issues.
* Multiple-field search conditions can be done with arrays of field names as 
keys in the :conditions hash (Alex Dowad).
* Removed named capture in regular expressions to maintain MRI 1.8 support 
(Michael Wintrant).
* Support new JDBC configuration style (Kyle Stevens).

-- 
Pat

On 11/08/2013, at 2:39 PM, Ngan wrote:

> Hi Pat,
> 
> Thanks for the help.  I tried upgrading to 2.1.0...and I'm noticing multiple 
> instance of searched running now.  Is that normal?  Would you be able to 
> point me to documentation of major changes with 2.1.0?
> 
> Thanks,
> Ngan
> 
> On Friday, August 9, 2013 7:57:51 AM UTC-7, Pat Allan wrote:
> Hi Ngan 
> 
> In 2.1.0 there's been some patches that deal with these kinds of errors - TS 
> will now retry searches if an error crops up on the client connection (which 
> is also persisted per thread in a connection pool, saving socket 
> setup/teardown time). If an error crops up, a new connection is made, but if 
> the error persists, it'll still get raised… 
> 
> Give 2.1.0 a spin, see if that helps matters. 
> 
> -- 
> Pat 
> 
> On 09/08/2013, at 10:46 PM, Ngan wrote: 
> 
> > Forgot to add the trace: 
> > 
> > gems/thinking-sphinx-2.0.14/lib/thinking_sphinx/search.rb:438:in `block in 
> > populate' 
> > gems/thinking-sphinx-2.0.14/lib/thinking_sphinx/search.rb:606:in `call' 
> > gems/thinking-sphinx-2.0.14/lib/thinking_sphinx/search.rb:606:in 
> > `retry_on_stale_index' 
> > gems/thinking-sphinx-2.0.14/lib/thinking_sphinx/search.rb:426:in `populate' 
> > gems/thinking-sphinx-2.0.14/lib/thinking_sphinx/search.rb:104:in `to_a' 
> > 
> > 
> > 
> > On Friday, August 9, 2013 5:45:55 AM UTC-7, Ngan wrote: 
> > Hi, 
> > 
> > We reindex our entire index pretty often (once every 3 minutes) because we 
> > have a pretty small data collection and we don't want to use delayed delta. 
> >  I notice however, that every once in a while, when we deploy our 
> > application and it happens to be the same time the reindexing is about to 
> > rotate, we'll get this error "no enabled local indexes to search" every 
> > time we hit sphinx there afterwards.  When this happens, we have to restart 
> > our app so that it picks up the new indexes.  We are reindexing with rotate 
> > so the existing index should still be there and the rotation should be 
> > seamless.  Any ideas on why this happens? And if there's anything to do 
> > about it? 
> > 
> > Thanks, 
> > Ngan 
> > 
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