Re: [jruby-user] Re: Super-simple DRb server hangs in JRuby (but not in C Ruby) when hit with multiple simultaneous requests

FYI: whatever it is, it's been fixed in 1.1b1


On Nov 19, 2007 7:23 PM, Scott Davies <scottd@xxxxxxxxx> wrote:
> Sorry, I should've been more specific about the test scenario: this
> was on a Mac running Leopard, using JRuby 1.0.2.
>
> -- Scott
>
>
> On Nov 19, 2007 4:21 PM, Scott Davies <scottd@xxxxxxxxx> wrote:
> > Hi --
> >
> > I just tried writing a Lucene indexserver running in DRb under JRuby,
> > and immediately ran into a problem where the server would very quickly
> > hang if I tried to throw requests at it from more than one client
> > simultaneously.  So, I yanked out all the Lucene stuff to diagnose the
> > problem, and sure enough, the problem has nothing to do with Lucene
> > and everything to do with JRuby and DRb.  Here's the test code in its
> > entirety:
> >
> > ------------------------------------------------
> > # test_server
> > #!/usr/bin/env jruby
> > require 'drb'
> >
> > class PingPong
> >   def ping
> >     "pong"
> >   end
> > end
> >
> > DRb.start_service("druby://127.0.0.1:4323", PingPong.new)
> > DRb.thread.join
> > -------------------------------------------------
> > # test_client
> > #!/usr/bin/env jruby
> > require 'drb'
> >
> > pingpong = DRbObject.new(nil, "druby://127.0.0.1:4323")
> >
> > i = 0
> > while true
> >   i = i+1
> >   pong = pingpong.ping
> >   puts pong + " " + i.inspect
> > end
> > --------------------------------------------------
> >
> > Everything works OK if I start one test_server process and then one
> > test_client process.  When I start up a second simultaneous
> > test_client process, though, within a few requests everything comes to
> > a screeching halt: the server fails to respond to any further
> > requests.  (Killing the clients and starting another doesn't help: the
> > server's still locked up.)
> >
> > If I use C Ruby for the server instead of JRuby, though, then
> > everything works fine.
> >
> > Am I missing something?  Is there a workaround for this problem?  Or
> > is JRuby almost entirely useless for DRb? :-(
> >
> > Thanks,
> >
> > -- Scott
> >
>
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