[Backgroundrb-devel] Intermittent "can't convert Float into Hash" and results.rb

Mason Hale masonhale at gmail.com
Tue Jan 9 15:54:44 EST 2007


I'm getting a similar error, here a partial stack trace:

20070108-20:17:45 (27597) can't convert Symbol into Hash - (TypeError)
20070108-20:17:45 (27597)
/opt/lss/demo/0.4-06/vendor/plugins/backgroundrb/server/lib/backgroundrb/results.rb:40:in
`merge!'
20070108-20:17:45 (27597)
/opt/lss/demo/0.4-06/vendor/plugins/backgroundrb/server/lib/backgroundrb/results.rb:40:in
`[]='

The process will run fine for hours or days, but then will stop with this
error. When it happens it takes now the entire BackgrounDRb server. (I'm
addding some begin/rescue blocks to hopefully prevent that.)

I've got Ruby 1.8.5p12 compiled with gcc 3.4.6 on RedHat Linux.

This also seems to occur with more than one process (running the same worker
class) at the same tim

Any ideas?

Mason

On 1/7/07, Robert Bjarnason <robert.bjarnason at gmail.com> wrote:
>
> Hi Bob,
>
> Thanks for the pointer, I agree this is probably not a directly
> backgroundrb related problem.  I built Ruby 1.8.4 on a Debian Linux box
> using gcc version 3.3.5.
>
> Warm regards,
> Robert Bjarnason
>
> Bob Hutchison wrote:
> > Hi,
> >
> > This sounds a bit like the trouble in OS X where you'd get a Fixednum
> > to String error. This was caused by a bug in the gcc 4.0 compiler. The
> > solution on OS X is to re-compile Ruby with -O1 optimisation level or
> > switch to the gcc 3.x compiler). As I understand it, with linux you
> > have the additional option of installing a newer version of gcc 4.x
> > and recompiling (I'm using 4.0.2 on one of my linux boxes and have
> > never seen the problem).
> >
> > Cheers,
> > Bob
> >
> > On 4-Jan-07, at 11:44 AM, Robert Bjarnason wrote:
> >
> >> Hi,
> >>
> >> I'm using backgroundrb 0.2.1 in a production environment and for most
> >> parts I'm very happy.  We are using it to do some heavy video editing
> on
> >> the server side and it works great except that under, what seems heavy
> >> load the below problem happens intermittently.
> >>
> >> The problem has only happened 5 times out of over 500 runs by our
> >> backgroundrb worker.
> >>
> >> This is the code in our worker:
> >>               logger.debug("info : progress: #{progress}")
> >>               progress_percent = progress * 100
> >>               if progress_percent >= 100
> >>                 results[:progress] = 99.99
> >>               else
> >>                 results[:progress] = progress_percent <-- Line of the
> >> crash
> >>               end
> >>
> >> Here is the error:
> >> can't convert Float into Hash
> >>
> >> And the beginning of the stack trace:
> >>
> /.../ContentStore/vendor/plugins/backgroundrb/server/lib/backgroundrb/results.rb:40
> >>
> >> :in
> >>
> `merge!'/.../ContentStore/vendor/plugins/backgroundrb/server/lib/backgroundrb/results.rb:40
> >>
> >> :in `[]='/.../ContentStore/lib/workers/content_worker.rb:40
> >> :in `execute_mp4box'/.../ContentStore/lib/workers/content_worker.rb:22:
> >> in `execute_mp4box'/.../ContentStore/lib/workers/content_worker.rb:21
> >> :in `execute_mp4box'/.../ContentStore/lib/workers/content_worker.rb:181
> >> :in
> >>
> `do_work'/.../ContentStore/vendor/plugins/backgroundrb/server/lib/backgroundrb/worker.rb:55:
> >>
> >> ...
> >>
> >> The problem seems to happen only under heavy load where more than 1
> >> worker process is active at the same time.
> >>
> >> Any ideas or leads?
> >>
> >> Thanks,
> >> Robert Bjarnason
> >>
> >> _______________________________________________
> >> Backgroundrb-devel mailing list
> >> Backgroundrb-devel at rubyforge.org
> >> http://rubyforge.org/mailman/listinfo/backgroundrb-devel
> >
> > ----
> > Bob Hutchison                  -- blogs at
> > <http://www.recursive.ca/hutch/>
> > Recursive Design Inc.          -- <http://www.recursive.ca/>
> > Raconteur                      -- <http://www.raconteur.info/>
> > xampl for Ruby                 -- <http://rubyforge.org/projects/xampl/>
> >
> >
> >
> >
>
> _______________________________________________
> Backgroundrb-devel mailing list
> Backgroundrb-devel at rubyforge.org
> http://rubyforge.org/mailman/listinfo/backgroundrb-devel
>
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