* USR2 + QUIT sometimes interrupts socket connections
@ 2011-08-19 22:46 Alex Sharp
2011-08-19 23:47 ` Eric Wong
2011-08-19 23:49 ` cliftonk
0 siblings, 2 replies; 6+ messages in thread
From: Alex Sharp @ 2011-08-19 22:46 UTC (permalink / raw)
To: unicorn list
I've seen this happen a few times during deploys/restarts, and I just
got a fresh backtrace, so I thought I'd bring this up.
The exception message I get is: Mongo::ConnectionFailure: Failed to
connect to host xxx.yyy.zzz.com and port 12345: Interrupted system
call - connect(2)
Basically, it looks like unicorn is interrupting connect(2) calls when
an underlying library is making a socket connection.
Backtrace: https://gist.github.com/1158216
Mongo pool.rb: https://github.com/mongodb/mongo-ruby-driver/blob/1.3.1/lib/mongo/util/pool.rb
I don't know if this is a unicorn thing or a Mongo implementation
problem, but I'm pretty sure I've seen this happen before with
Net::HTTP. I'll try to locate that error.
--
alex sharp
github.com/ajsharp
twitter.com/ajsharp
alexjsharp.com
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* Re: USR2 + QUIT sometimes interrupts socket connections
2011-08-19 22:46 USR2 + QUIT sometimes interrupts socket connections Alex Sharp
@ 2011-08-19 23:47 ` Eric Wong
2011-08-20 0:04 ` Alex Sharp
2011-08-19 23:49 ` cliftonk
1 sibling, 1 reply; 6+ messages in thread
From: Eric Wong @ 2011-08-19 23:47 UTC (permalink / raw)
To: unicorn list
Alex Sharp <ajsharp@gmail.com> wrote:
> The exception message I get is: Mongo::ConnectionFailure: Failed to
> connect to host xxx.yyy.zzz.com and port 12345: Interrupted system
> call - connect(2)
<snip>
> I don't know if this is a unicorn thing or a Mongo implementation
> problem, but I'm pretty sure I've seen this happen before with
> Net::HTTP. I'll try to locate that error.
This is a bug in fixed in Ruby 1.9.2-p290 (r31829 in the ruby_1_9_2 branch)
--
Eric Wong
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* Re: USR2 + QUIT sometimes interrupts socket connections
2011-08-19 22:46 USR2 + QUIT sometimes interrupts socket connections Alex Sharp
2011-08-19 23:47 ` Eric Wong
@ 2011-08-19 23:49 ` cliftonk
2011-08-20 0:11 ` Eric Wong
1 sibling, 1 reply; 6+ messages in thread
From: cliftonk @ 2011-08-19 23:49 UTC (permalink / raw)
To: unicorn list
On Aug 19, 2011, at 5:46 PM, Alex Sharp wrote:
> The exception message I get is: Mongo::ConnectionFailure: Failed to
> connect to host xxx.yyy.zzz.com and port 12345: Interrupted system
> call - connect(2)
I've been experiencing the same issue in production with fauna/memcached gem which is backed by the libmemcached C library.
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* Re: USR2 + QUIT sometimes interrupts socket connections
2011-08-19 23:47 ` Eric Wong
@ 2011-08-20 0:04 ` Alex Sharp
0 siblings, 0 replies; 6+ messages in thread
From: Alex Sharp @ 2011-08-20 0:04 UTC (permalink / raw)
To: unicorn list
> This is a bug in fixed in Ruby 1.9.2-p290 (r31829 in the ruby_1_9_2 branch)
Great, thanks much.
- alex
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* Re: USR2 + QUIT sometimes interrupts socket connections
2011-08-19 23:49 ` cliftonk
@ 2011-08-20 0:11 ` Eric Wong
2011-08-20 7:37 ` Eric Wong
0 siblings, 1 reply; 6+ messages in thread
From: Eric Wong @ 2011-08-20 0:11 UTC (permalink / raw)
To: unicorn list
cliftonk@gmail.com wrote:
> On Aug 19, 2011, at 5:46 PM, Alex Sharp wrote:
> > The exception message I get is: Mongo::ConnectionFailure: Failed to
> > connect to host xxx.yyy.zzz.com and port 12345: Interrupted system
> > call - connect(2)
>
> I've been experiencing the same issue in production with
> fauna/memcached gem which is backed by the libmemcached C library.
Unlike Mongo and Net::HTTP, the memcached gem doesn't use the standard
Ruby socket library. Can you show us a backtrace (and probably Cc: Evan
Weaver (fauna)) so we can get it fixed?
Any process accepting signals can have system calls fail with
EINTR, and buggy libraries don't handle it properly.
The Ruby standard library is mostly good at gracefully handling EINTR,
and I've gotten all instances I've encountered fixed in MRI 1.9.x.
--
Eric Wong
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* Re: USR2 + QUIT sometimes interrupts socket connections
2011-08-20 0:11 ` Eric Wong
@ 2011-08-20 7:37 ` Eric Wong
0 siblings, 0 replies; 6+ messages in thread
From: Eric Wong @ 2011-08-20 7:37 UTC (permalink / raw)
To: unicorn list
Eric Wong <normalperson@yhbt.net> wrote:
> cliftonk@gmail.com wrote:
> > On Aug 19, 2011, at 5:46 PM, Alex Sharp wrote:
> > > The exception message I get is: Mongo::ConnectionFailure: Failed to
> > > connect to host xxx.yyy.zzz.com and port 12345: Interrupted system
> > > call - connect(2)
> >
> > I've been experiencing the same issue in production with
> > fauna/memcached gem which is backed by the libmemcached C library.
>
> Unlike Mongo and Net::HTTP, the memcached gem doesn't use the standard
> Ruby socket library. Can you show us a backtrace (and probably Cc: Evan
> Weaver (fauna)) so we can get it fixed?
Evan said (privately to me) to open a ticket for memcached
so he or Brandon can fix it. I guess
https://github.com/fauna/memcached/issues ?
--
Eric Wong
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end of thread, other threads:[~2011-08-20 7:58 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
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2011-08-19 22:46 USR2 + QUIT sometimes interrupts socket connections Alex Sharp
2011-08-19 23:47 ` Eric Wong
2011-08-20 0:04 ` Alex Sharp
2011-08-19 23:49 ` cliftonk
2011-08-20 0:11 ` Eric Wong
2011-08-20 7:37 ` Eric Wong
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