[rabbitmq-discuss] Just publishing messages causes rabbit_writer:mainloop to hang and simultaneous pub problem

[Joe Lee]

I ran the same files that I sent earlier:

amqp_async_consume.erl
amqp_async_pub.erl
my_pmap.erl
rabbit_test.erl

Where I made changes to what you have suggested.  In rabbit_test.erl,
made MyList = [<<1>>,<<2>>,<<3>>].  Ran the rabbit_test:main() in
separate erlang shell.  If you are not seeing 3
rabbit_writer:mainloop/1 process in erlang node after running
rabbit_test:main(), then it could be the case that my erlang &
rabbitmq setup maybe not be installed properly or missing some
packages.

Let me know if this the case on your side,
Joe

> > I sent 3 amqp message to the rabbitmq broker from a separate erlang
> > client node.  The three 3 amqp messages create 3
> > rabbit_writer:mainloop/1 processes.  This rabbit_writer:mainloop/1
> > process never goes away.
> >
> > <0.71.0>              rabbit_writer:mainloop/1
> > 233      132    0
> >                       rabbit_writer:mainloop/1                 2
> > <0.72.0>              rabbit_writer:mainloop/1
> > 233      132    0
> >                       rabbit_writer:mainloop/1                 2
> > <0.73.0>              rabbit_writer:mainloop/1
> > 233      132    0
> >                       rabbit_writer:mainloop/1                 2
> >
> > One rabbit_writer:mainloop process traced:
> >
> > initial_call: rabbit_writer:mainloop/1
> > current_function: rabbit_writer:mainloop/1
> > heap_size: 233
> > stack_size: 2
> > reductions: 132
> > trap_exit: false
> > <0.72.0>: getting_linked   <0.112.0>
> >
> > After that I increased number of processes on a single erlang node
> > to something higer than 50 000 and sent 50 000 messages.  For some
> > reason, 50 000 rabbit_writer:mainloop processes are still there.
> > They don't go away.  Processes only go away when I restart the
> > rabbit erlang client node.
> >
> > 7> erlang:system_info(process_count).
> > 50044
>
> Can you send the source of the test that is producing this behaviour,
> please?
>
> HTH,
>
> Ben
>
>
>
>
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