[rabbitmq-discuss] "rabbitmqctl cluster_status" output - quoted or not quoted?

[Jerry Kuch]

Good luck! And of course ping us again if you have further questions as you move forward...

Jerry

Sent from my iPhone (Brevity and typos are hopefully the result of 1-fingered typing rather than rudeness or illiteracy).


On Nov 8, 2012, at 11:31 AM, Jerry Bao <hijerrybao at gmail.com> wrote:

> Thanks a lot for the answer. I will go pick up an Erlang book, right now....
> 
>> Date: Wed, 7 Nov 2012 14:23:24 -0800
>> From: Jerry Kuch <jerryk at rbcon.com>
>> Subject: Re: [rabbitmq-discuss] "rabbitmqctl cluster_status" output -
>>         quoted or not quoted?
>> To: Discussions about RabbitMQ <rabbitmq-discuss at lists.rabbitmq.com>
>> Message-ID:
>>         <CAE0Sz=xebJqYuVCRNR0qnxPzz6t6NSdduOA5SRFCbAi8i-1T4g at mail.gmail.com>
>> Content-Type: text/plain; charset="iso-8859-1"
>> 
>> Hi, Jerry:
>> 
>> Note those '-' signs in the quoted ones.  Erlang's demanding that an atom
>> name be escaped in single quotes so that the hyphen doesn't get taken as a
>> minus sign, thereby producing a gibberish expression.
>> 
>> If you're writing something to systematically parse things like this, you
>> might find looking at an Erlang reference useful so you can get a sense for
>> what types are involved in such expressions, and what the syntactic
>> conventions and requirements are on their structures...
>> 
>> Best regards,
>> Jerry
>> 
>> On Wed, Nov 7, 2012 at 2:08 PM, Jerry Bao <hijerrybao at gmail.com> wrote:
>> 
>> > Why do some "rabbitmqctl cluster_status" outputs have single quote around
>> > the nodes, others do not?
>> >
>> > For example,
>> > *[root at jbao-vm1 ~]# rabbitmqctl cluster_status*
>> > *Cluster status of node 'rabbit at jbao-vm1' ...*
>> > *[{nodes,[{disc,['rabbit at jbao-vm2','rabbit at jbao-vm1']}]},*
>> > * {running_nodes,['rabbit at jbao-vm2',*
>> > *                 'rabbit at jbao-vm1']}]*
>> > *...done.*
>> > *
>> > *
>> > On another cluster, I have somthing like this:
>> >
>> > rabbit1$ *rabbitmqctl cluster_status*
>> > Cluster status of node rabbit at rabbit1 ...
>> > [{nodes,[{disc,[rabbit at rabbit1,rabbit at rabbit2]},{ram,[rabbit at rabbit3]}]},
>> >  {running_nodes,[rabbit at rabbit2,rabbit at rabbit1]}]
>> > ...done.
>> >
>> > They are same version of RabbitMQ/Erlang/OTP, all on the same CentOS 5.7
>> > 64bit.
>> >
>> > I am trying to write a script to parse it so I can monitor the status of
>> > the cluster. I have been working with RabbitMQ for a while but am
>> > relatively new to Erlang. Does anybody know why? Is this a Erlang or OS
>> > locale issue?
>> >
>> > I know I can write my parser to handle both cases but just want to know
>> > what is causing that.
>> >
>> > Thanks,
>> >
>> > Jerry
>> >
>> >
>> >
>> > _______________________________________________
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>> >
>> >
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