launchpad-dev team mailing list archive

["Francis J. Lacoste" <francis.lacoste@xxxxxxxxxxxxx>]

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Elliot suggested today that the Erlang OTP isn't really meant to start
multiple RabbitMQ instance on the same box. And gave the same suggestion
than Stuart about how to multiplex test runs: use a variable queue prefix.

That's how U1 is doing it, it seems.

On 11-06-15 04:02 PM, Robert Collins wrote:
> On Thu, Jun 16, 2011 at 7:46 AM, Gavin Panella
> <gavin.panella@xxxxxxxxxxxxx> wrote:
>> On 14 June 2011 12:06, Gavin Panella <gavin.panella@xxxxxxxxxxxxx> wrote:
>> [...]
>>> After your suggestion of looking at http://bugs.python.org/issue1652 I
>>> am now running a branch through ec2 to reset the SIGPIPE handler when
>>> spawning:
>>>
>>>  https://code.launchpad.net/~allenap/launchpad/rabbit-fixture-sigpipe/+merge/64531
>>>
>>> Let's see if this works!
>>
>> It didn't.
>>
>> However, I had some success today. I patched TestRabbitFixture to run
>> test_start_check_shutdown 1000 times. In ec2 it failed about 1 time in
>> 100 with:
>>
>>  Cookie file /.../.erlang.cookie must be accessible by owner only
>>
>> This looks like a race! However, it isn't the same error as outlined
>> in bug 788557... but it's similar enough that perhaps fixing this
>> would fix both.
>>
>> When the RabbitMQ daemon is spawned, the parent process immediately
>> starts checking the daemon's state by calling `rabbitmqctl -n
>> ... status`, and thereafter a few times every second. The first
>> invocation of rabbitmqctl is likely racing with the daemon to create
>> the cookie file.
>>
>> I patched up the fixture code - http://paste.ubuntu.com/627585/ - to
>> check for the cookie before running rabbitmqctl and ran the test
>> (again, 1000 times) in ec2 with no errors. \o/
>>
>> It struck me that a simpler fix might simply be to run `rabbitmqctl -n
>> ... status` at least once before starting the daemon. I'll prepare a
>> branch to do that in the morning.
> 
> \o/
> 
> Thats awesome news. Thanks!
> 
> -Rob
> 
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- -- 
Francis J. Lacoste
francis.lacoste@xxxxxxxxxxxxx
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